20 U.S. NATIONAL MUSEUM BULLETIN 290 



61(60). Larger, length 4.3 to 6.0 mm.; prosternal spine in lateral view short, 

 pointed, not parallel-sided; elytra usually vittate (fig. 78); Virginia 



to Florida to Louisiana obsoletus obsoletus Germar 



Smaller, length 4.0 to 4.3 mm.; prosternal spine in lateral view elongate, 

 nearly parallel-sided; elytra not or vaguely vittate (fig. 107); 



Massachusetts obsoletus indistinctus, new subspecies 



62(57). Fifth and sixth elytral striae confused and intertwined, striae usually 

 darkly pigmented and strongly contrasting with yellow background 



(fig. 68j ; Arizona umbonatus Schaeffer 



Fifth and sixth elytral striae not confused or intertwined, striae pig- 

 mented or not (figs. 91 and 93); various localities 63 



63(62). Ventral surface, legs, head, and pronotum unicolorous, very dull reddish 

 orange, elytra creamy yellow (fig. 99) ; elytron behind humerus with 

 one or two punctures in addition to regular rows; Texas. 



dorsatus, new species 

 Color not as above; elytron behind humerus with four to seven punctures 



in addition to regular rows; California to Texas 64 



64(63). Dorsal surface light orange-yellow to orange, pronotum without dark 

 markings (sometimes with minute speckling); striae finer (fig. 93). 



cerinus cerinus White 

 Dorsal surface orange to clouded reddish orange, pronotum with darker 



markings; striae coarser (fig. 91) spurcus spurcus Leconte 



65(50). Each elytron with at least one complete, dark, longitudinal stripe 



(sometimes vague) 66 



Elytral markings of incomplete or interrupted stripes, spots, or markings 



transverse or irregular 84 



66(65). Elytral vittae or markings narrow, each (except sometimes lateral 



spots) confined to one interval or to a single stria 67 



Elytral vittae or markings broad, at least one at widest point including 



two or three intervals 77 



67(66). Inner elytral vittae narrow, each confined to a single stria (fig. 71); 



southeastern U.S albicans Haldeman 



Inner vittae broader, each encompassing an interval; various lo- 

 calities 68 



68(67). Elytron with two dark vittae or only vestiges (fig. 80); Texas. 



brunneovittatus Schaeffer 

 Elytron with tliree dark vittae, outer two may be interrupted; various 



localities 69 



69(68). Second vitta interrupted once near apex, third interrupted twice 



(fig. 63); Texas to Arizona snowi Schaeffer 



Vittae not as above; various localities 70 



70(69). Dark markings of pronotum black, distinct, margins sometimes 



narrowly reddish 71 



Dark markings of pronotum orange, red, or brown, vague to distinct, 



infrequently black in part 72 



71(70). Background color of elytra light orange (fig. 92). 



spurcus vandykei White 

 Background color of elytra creamy yellow (fig. 94). 



alternans jungovittatus, new subspecies 

 72(70). Pronotum at side with a small, distinct, isolated dark spot; Fig. 47. 



simulans simulans Schaeffer 

 Pronotum at side without a dark spot 73 



