314 AMERICAN PACHYBRACHYS (cOLEOPTERa) 



3. Front tibiae of c? sinuate on the inner margin at the apex and with a long 



hook-like spur or process at the inner angle. 



Eyes separated in the d" by about f , and in the 9 by barely the length 

 of the basal antennal joint ; size smaller (2.4 to 2.8 mm.). (Brownsville, 



Texas.) 44. texanus 



Eyes separated in the d" by about f , and in the 9 by just visibly more 

 than the length of the basal antennal joint; size larger (2.9 to 3.5 mm.). 



(Arizona.) 45. uncinatus 



Front tibiae sinuate on the inner margin beyond the middle in both sexes. 



(New England to Illinois.) 46. pectoraUs 



Front tibiae umnodified 4 



4. Front with ocular hues; form narrower. (Eastern United States.) 



47. sobrinus 

 Front without ocular lines; form generally stouter 5 



5. Antennae less slender, the 10th joint (c?) not more than three times as long 



as wide. 



Intermediate elytral striae broken and irregular. (Arizona.) 



48. contractifrons 



Elytral striae nearly regular. (Arizona.) 49. alacris 



Antennae more slender, the 10th joint (o") five times as long as wide; front 

 claws of cf very large. 



Punctuation throughout sparse except in the small darker pronotal 

 markings; elytral punctuation very irregularly disposed, the submargi- 

 nal and some short fragments of striae on the declivity alone evident. 



(Arizona.) 50. chaoticus 



Punctuation of pronotiun dense throughout the broad suffused darker 

 areas; elytra moderately nmnerously punctate, the striae better defined. 

 (Lower California.) 52. peninsularis* 



6. Front claws of cf very distinctly enlarged 7 



Front claws of cf not or but little enlarged 10 



7. Sides of prothorax widely impunctate along the margin 51. peitatus 



Sides of prothorax narrowly impunctate along the margin S 



Sides of prothorax not or scarcely smoother, the punctuation extending 



nearly or quite to the extreme margin 9 



8. Eyes in the cf separated by a distance subequal to the length of the basal 



antennal joint. 



Size large (about 4 mm.); prothorax strongly rounded and inflated at 



sides posteriorly. (Texas.) 53. turgidicoUis 



Size much smaller (2f mm.); prothorax normally rounded at sides. 



Florida.) 54. illectus 



Eyes in the cf separated by I3 to 1| times the length of the basal antennal 

 joint (a little more widely in some punctaius). 

 Front without ocular lines. 



Pale yellow, markings faint, those of the elytra represented by faint 

 lateral spots only; head a little wider than the thoracic apex. (Utah.) 



55. proximus 



Markings larger and darker, the standard spots all present, head not 



wider than the thoracic apex. (Arizona.) 56. nunenmacheri 



