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j1. Hind femora less than three times as long

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13. terrestris.

as broad j. Hind femora three and a half times as long as broad 14. celatus. 22. Hind tibiæ considerably longer than the femora, the spurs half as long again as the tibial depth, the hind femora only about twice as long as the fore femora

g. Fore femora of

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15. brevipes.

nearly one half longer than the pronotum ; outer carina of hind femora of male spined, not serrulate. 16. lapidicola. f. The lighter colors which are more massive prevail above, the darker appearing principally as posterior bands to the segments and rarely darker than fuscocastaneous, rarely with a light mediodorsal line.

g1. Outer carina of hind femora of armed with
only a few raised points.

h1. Hind femora slender, nearly three and a half
times longer than broad
17. arizonensis.

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18. uniformis.

h2. Hind femora stout, about two and a half times longer than broad d. Hind tibiæ of arcuate or sinuous; outer carina of hind femora of always conspicuously spined.

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e1. Hind femora very long, four times as long as broad,
the fore femora fully three fourths as long again as the
pronotum .
19. heros.
e2. Hind femora relatively short, not more than three and
a half times longer than broad, the fore femora consider-
ably less than half as long again as the pronotum.

f1. Inferior sulcus of hind femora of broadening
proximally

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20. uhleri.

f2. Inferior sulcus of hind femora of of uniform width 21. blatchleyi. b2. Fore femora but little if any longer than the pronotum even in the male; hind tibiæ of male usually straight, but often bowed or sinuate.

c1. Dorsal surface of abdomen of

d1. Hind tibiæ of

e1. Hind tibiæ of

smooth and even.

arcuate or sinuate in basal half.

considerably longer than the femora ;

hind tibial spurs usually at least half as long again as the tibial depth.

f1. Hind femora of

relatively long, three and a half

times as long as broad; no large spines on outer carina.

f2. Hind femora of

30. maculatus. relatively stout, rarely exceeding

three, never three and a quarter, times as long as broad;

some spines on outer carina as long as the tibial spurs. g1. Hind tibiæ of at least a tenth longer than the femora.

h1. Hind femora of two and a half times longer than the fore femora; hind tibial spurs only slightly longer than the tibial depth.

28. meridionalis.

h2. Hind femora of but little more than twice as long as the fore femora; hind tibial spurs nearly twice as long as the tibial depth . 45. inquinatus. less than one tenth longer than

g2. Hind tibiæ of

the femora .

e2. Hind tibiæ of femora; hind tibial depth.

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at most scarcely longer than the

spurs rarely longer than the tibial

f1. Hind femora of three or more than three times as long as broad; fore femora nearly or quite a fifth longer than the pronotum.

g'. Hind tibiæ of at most feebly sinuate at base. 39. agassizii.

g. Hind tibiæ of very strongly bowed.

f. Hind femora of

34. valgus. less than three times as long as

broad; fore femora only an eighth longer than the pro

notum.

g1. Hind tibiæ of
with a row of spines

strongly bowed, armed below mounted on nodules.

33. nodulosus.

g2. Hind tibiæ of faintly sinuate at base, normally

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e1. Outer carina of hind femora of armed with prominent conical spines, generally well separated.

f. Hind tibiæ of less than one tenth longer than the femora.

g1. Dorsal surface of body almost uniformly very dark, almost black, the lighter markings themselves

not very light nor extensive, and therefore incon-
spicuous.

h1. Hind tibial spurs generally excessively diver-
gent, extending in nearly opposite directions on the
two sides and set at a high angle with the tibia.
35. divergens.
h2. Hind tibial spurs rarely exceeding 120° in
divergence, and set at an angle with the tibia not
exceeding 50°.

1. Smaller species, with pallid sides, luteous
legs, and narrow dorsal stripe, the hind tibiæ of
the a twelfth as long again as the femora.
23. cacus.

2. Larger species, with castaneous sides and legs
and broad dorsal stripe, the hind tibiæ of not
a thirtieth longer than the femora . 26. sallei.
g2. Dorsal surface of body with conspicuously con-
trasted dark and light markings, neither prevailing
over the other .
47. pallidus.

f. Hind tibiæ of a tenth longer than the femora.

32. bicolor. e2. Outer carina of hind femora of more or less delicately serrate or armed with recumbent spines.

f1. Body of male very compact, short subfusiform, not or hardly more than two and a quarter times as long as broad.

g1. Hind femora of

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relatively stout, considerably less than three times as long as broad, the hind tibiæ longer than the femora, and the spurs only as long as the tibial depth 24. nigricans. g2. Hind femora of ♂ relatively slender, three times as long as broad, the hind tibiæ shorter than the femora and the spurs nearly half as long again as the tibial depth 25. fusiformis. f2. Body of much more elongated, rarely distinctly fusiform, over three and generally at least four times as long as broad.

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g1. Hind tibiæ of at least a tenth longer than the femora.

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h2. Body with conspicuously contrasted colors; hind femora of relatively slender, less than three and a quarter times as long as broad 46. discolor. g. Hind tibiæ of less than one tenth longer than the femora.

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h1. Hind femora of with no raised points on the distal half.

upper

¿1. Outer carina of hind femora of

almost

unarmed; markings of the body more or less marmorate or maculate.

j1. A broad continuous light dorsal stripe on pronotum, usually extending over the whole thorax.

k1. Hind tibial spurs distinctly marked with black at base; ovipositor twice as long as fore femora 27. latens. k2. Hind tibial spurs at most indistinctly infuscated at base; ovipositor shorter than fore femora. . 31. tenebrarum. j. A narrow and very unequal light dorsal stripe on pronotum, interrupted, if present, on rest of thorax . 38. bruneri. 2. Outer carina of hind femora of finely and closely serrate; dark markings of body confined to transverse borderings of the segments.

48. vinculatus. h2. Hind femora of with a greater or less number of raised points on upper distal half.

¿1. Hind femora of with only a few distant recumbent spines on outer carina.

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j. Hind tibiæ of a tenth longer than the femora; spurs fully twice as long as tibial depth. 44. pinguis. j2. Hind tibiæ of less than a tenth longer than the femora; spurs much less than twice as long as tibial depth . 40. mexicanus. 2. Hind femora of with numerous denticulations on the outer carina, forming a more or less close serration.

j. Ovipositor relatively short, at most but little more than half as long as hind femora.

k1. Hind femora of less than twice as long as fore femora.

1. Hind tibiæ of no longer than femora; spurs only a little longer than tibial depth, and divaricating about 60°; inner carina of fore femora minutely serratulate 50. californianus. 12. Hind tibiæ of a little longer than femora; spurs fully twice as long as tibial depth, and divaricating about 90°; inner carina of fore femora simply spined.

49. testaceus.

k2. Hind femora of two and a fourth times as long as fore femora 29. neglectus. j. Ovipositor relatively long, two thirds as long as hind femora or more.

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k2. Hind femora of relatively siout,
hardly more than two and a half times as
long as broad
43. crassus.

c2. Dorsal surface of abdomen of closely tuberculate; hind

tibiæ strongly arcuate.

d1. Both outer and inner carina of hind femora of armed
with a large compressed spine as long as the depth of the
genicular lobes.
52. pacificus.

d2. Outer carina of hind femora of elevated to a high
lamina, suddenly terminating acutely before the genicular
lobes
53. henshawi.

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a2. Second joint of hind tarsi but little longer than the third. b1. Large species; outer carina of hind femora considerably and uniformly elevated throughout . .. 54. devius.

b2. Small species; outer carina of hind femora elevated distally much more than proximally 55. neomexicanus. The male being unknown to me, C. sylvestris does not appear in the above table. It will be found below as No. 41.

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