H. C. FALL 321 



47. Front with ocular lines. 



Prothorax moderately narrowed in front. (New Mexico to Colorado.) 



122. alticola 

 Prothorax transversely quadrate, scarceh' narrowed in front; eyes 

 slightly closer; elj-tral striae a little less impressed. (Arizona.) 



111. truncatus* 

 Front without ocular lines. 



Eyes separated in the cf by twice the length of the basal antennal joint; 

 size rather large (.3.5 mm. or more). 

 Form less robust, prothorax feebly narrowed in front, side margins 

 rather broadly impunctate, color predominantly black. (Cali- 

 fornia.) 117. lustrans* 



Form very robust, prothorax moderately (suhnllaluf;) to st rough- 

 (inistabilis) narrowed in front, the side margin very narrowh- or 

 partially smooth. 



Yellow, prothorax shorter, trivittate with black, the median vitta 



divided in front, legs pale. (Texas.) 120. subvittatus 



Red or reddish yellow and black, thorax not trivittate, legs black. 



(Texas to Kansas.) 1.52. instabilis"^ 



Eyes separated in the cf by less than twice the length of the basal 

 antennal joint. 



Size large (3.5 to 5 mm.); elytral punctuation almost completely 



confused. (Colorado to Arizona.) 116. varicolor* 



Size much smaller (2.25 to 3.1 mm.); eh-tral striae evident. 



Antennae less elongate, the 10th joint less than three times as 

 long as wide in the cT; eljiral striae more regular. (Texas to 



CaUfornia.) 123. laevis 



Antennae more elongate, 10th joint four times as long as wide; 

 elytral striae much broken; size generally larger. (Arizona.) 



125. conspirator* 



Group D 

 (Specie.s starred (*) are tabulated in more than one group.) 

 The species of this group are not very numerous, and are 

 generally easily recognized. In the typically marked forms the 

 elytra are yellow or testaceous with the suttire and two vittae 

 on each, black. The outer vitta is more subject to reduction or 

 disintegration than the inner, and in hivittatus and allies is com- 

 monly interrupted to form three spots, one or more of which 

 may be lacking (as in hivittatus), or the two vittae may 1)C fused 

 into a single broad stripe- — as in circumcindus and consimihs. 

 In sublimatus the inner vitta also may be entirely lacking, in 

 consequence of which it has been necessary to also tabulate the 

 species in Group C. In autolycus varieties difficilis and wahsat- 



TRAXS. AM. EXT. SOC, XM. 



