316 AMERICAN PACHYBRACHYS (cOLEOPTERa) 



14. Lustre dull, prothorax very densely punctate, terminal joint of antennae 



dilated in the c?; elytral striae deeply impressed. (Texas and Arizona.) 



68. laticoUis 

 Lustre moderately shining, prothorax not very densely punctate, terminal 

 joint of antennae not dilated. 



Elytral punctuation much confused, striae feebly impressed. (Arizona.) 



66. snowi 



Elytral punctuation more regular, striae rather deeply impressed. 



(Kansas; Texas.) 67. turbidus 



15. Eyes more narrowly separated in both sexes than the vertical width of 



their upper lobes; elytra with a small but conspicuous blackish sutural 



spot on the convexity. (Brownsville, Texas.) 69. duryi 



Eyes in the 9 as widely separated at least as the vertical width of their 

 upper lobes ; elytra without conspicuous sutural spot on the convexity . . 16 



16. Integuments polished 124. nubilus* 



Integvnnents with more or less distinct alutaceous sculpture 17 



17. Side margins of prothorax smooth, markings throughout black or nearly 



so, and more sharply contrasting. (Texas.) 70. gracilipes 



Side margins of prothorax punctate more or less completely; markings 

 brown to fuscous and less sharply defined. 



Eyes in cf separated by fully 1| times the length of the basal anten- 

 nal joint; prothorax less densely punctured along the side margins. 



(Atlantic States.) 71. confederatus 



Eyes in the cf separated by scarcely more than the length of the basal 

 antennal joint; prothorax more densely punctured along the side mar- 

 gins. (Georgia.) 72. tybeensis 



IS. Front tibiae of cf emarginate inwardly at apex and with a long si)iu--like 



process at the inner angle 73. calcaratus 



Front tibiae of cf unmodified 19 



19. Front claws of cf strongly enlarged 20 



Front claws of c? perceptibly larger than the others but in variable degree 



(quite conspicuously so in badius and nubigenus, only very sUghtly so in 



bajulus and delumbis) 22 



Front claws of cf not appreciably enlarged (perceptibly larger in sribvittatus , 

 presumably so in spumarius and quite distinctly so iu some examples of 

 roboris) 29 



20. Prothoracic punctuation equally close to the extreme side margin (a little 



smoother in those examples of caiifornicus having the side margins yellow) ; 

 predominant color black. 



Elytral punctuation confused throughout; lustre dull. (Southern 



States.) 149. confusus* 



Elytra distinctly striate toward the sides and rear; lustre .strongly 



shining 118. caiifornicus* 



Prothoracic punctuation sparser or absent along the side margins 21 



21. Prothorax fiiK^ly sparsely punctate, elytral striae mucli broken, color pre- 



dominantly pale yellow, size rather large (3.3 to 4.3 mm.). (Arizona.) 



74. cylindricus 



