H. C. FALL 323 



Vittae more or less imperfect and usually brow-nish. 



^■ar. imperfectus 

 Outer el>iral vitta beginning on the 7th and Sth interspaces, and 

 ending on the 6th and 7th. 



Median pronotal stripe narrowly V-shaped; size smaller (2.7 to 



3.8 mm.) 134. dubiosus 



Median pronotal stripe not V-shaped but merely dilated a little 

 anteriorly, the dilated portion usually showing a very narrow 

 more or less obscure paler median line; size larger (3.7 to 



4.4 mm.) 133. virgatus 



Elytra yellow with a single narrow, often imperfect or subobsolete median 

 vitta; the shoulder knob and a posterior spot (representing an outer vitta) 



black 137. umbraculatus 



Elytra yellow with a single straight sharply defined but narrow vitta and 



the shoulder knob black 144. picturatus 



Eljira black, with a narrow subsutural vitta, an intrahumeral basal spot, 

 and the lateral and apical margin atIIow; legs rufo-testaceous. 



141. autolycus var. difficilis* 



El>i;ra black, with narrow subsutural vitta and external margin yellow; legs 



browniish black in great part 141. autolycus var. wahsatchensis* 



Group E 



(Starred species (*) are tabulated in more than one group) 

 Species wholly or in great part black, or if the pale areas are 

 more extensive they are definitely arranged (discoideus, margina- 

 tus, cruentus, dilatatus, subfasciatus), not irregular and fragmen- 

 tary as is typically the case in Group C. Occasionally in stygicus, 

 and more often in luridus, lustrans and confusus, the pale spots 

 are larger or more numerous, for which reason the three last 

 named species have been tabulated also in Group C. 



1. Anterior tibiae without terminal spur; last joint of maxillary palpi nearl}^ 



similar in the sexes; antennae nearly as long as the entire body in the cf . 

 Black, prothorax with side margins, apical edge and three discal spots 



reddish yellow, legs entirely black 147. trinotatus 



Similar, but with prothorax narrower, sides straight er; elytra usually 

 with small scattered fulvous spots, even more densely but less coarsely 



punctate; legs with small yellow spots 14S. pulvinatus 



Anterior tibiae with terminal spur, last joint of maxillary palpi more or less 

 obviously more widely truncate at apex in the cf ; antennae les< elongate . . 2 



2. Pale areas or markings generally broader and definite in arrangement or 



design 3 



Pale markings as a rule irregularly disposed, generally small and inconsjjic- 

 uous (much more extensive in some examples of lustrmis and luri'lus); pro- 

 thoracic markings, when present, consisting typically of a narrow median 



TRANS. AM. ENT. SOC, XLI. 



