318 AMERICAN PACHYBRACHYS (cOLEOPTERa) 



Yellow, with median thoracic stripe and posterior elytral fascia black- 

 ish; front claws of cf but little enlarged. (Arizona to Texas.) 



8.3. signatus 



26. Prothoracic markings always more or less diffuse, reddish or pale brown to 



fuscous, elytral spots more or less pronounced 27 



Prothoracic markings in the form of three somewhat irregular heavily 

 marked black vittae, which are not or only narrowly connected in front, 

 and are sharply defined; elytral spots nearly or quite wanting. (Arizona.) 



91. bajulus 



27. Pronotum almost completely suffused with reddish brown, the punctua- 



tion of the disk dense and nearly uniform; front claws of cf rather 



strongly enlarged. (California.) 8G. badius 



Pronotum lightly to heavily variegated with pale brown to fuscous, the 

 punctuation less dense and more uneven, the front claws of the (f less 

 conspicuously enlarged 28 



28. Front claws of cT quite noticeably though not strongly enlarged. 



Prothorax only just perceptibly wider than the head, scarcely at all nar- 

 rowed in front, the base and apex subequal. (California.) 



87. quadra tus 

 Prothorax obviously wider than the head though not greatly so, sides a 

 little convergent in front, the apex never as wide as the base. 



Punctuation less dense, front claws of cf slightly more enlarged. 



(Cahfornia to Texas.) 88. mobilis 



Punctuation more dense, front claws of cf rather less enlarged. 



(California.) 90. pluripunctatus 



Front claws of cf only very slightly larger than the others, eyes a little less 

 distant. (Texas.) 89. delumbis 



29. Head and prothorax and usually the elytra distinctly alutaceous, dull or 



at most moderately shining 30 



Head and upper surface strongly shining, polished or with but the faintest 

 trace of alutaceous sculpture 47 



30. Size large (4 to 6 mm.) ; elytral punctuation almost completely confused . 31 

 Size somewhat smaller (3.7 to 4.25 mm.); elytral striae very imperfect and 



fragmentary but present at least toward and on the posterior convexity; 

 prothoracic markings reddish brown, broadly suffused, the elytra) spots 



black, heavy. (Arizona.) 94. sanrita 



Size moderate or small, always less than 4 mm., rarely over 3.5 mm 32 



31. Antennae extremely slender and filiform, 10th joint four to five times as 



long as wide; pygidium of 9 widely margined. (Arizona.). .92. nobilis 

 Antennae less slender, 10th joint about three times as long as wide; pygi- 

 dium of 9 normally margined. 



Legs fuscous. (New Mexico.) 93. fuscipes 



Legs rufo-testaceous. (Arizona.) . .var. purgatus 



32. Prothoracic punctuation dense to side margins 33 



Prothoracic punctuation sparser or absent along the side margins, the 



latter narrowh' smooth, at least in part 35 



33. Punctures antl markings black or fuscous 34 



