H. C. FALL. 165 



instead of the fourth and fifth as in all the typical species of 

 the group. In this latter particular ulkei also agrees with 

 pruininus and sordidus as might be expected from its affini- 

 ties with Group VII, in which this is the prevailing style of 

 striation. 



Vertex with subtriangular, glabrous, impunctate area ; prothorax and 

 broad triangular sutural area very densely whitish pubes- 

 cent, sides of elytra black, more broadly so posteriorly; 

 size large (4-5 mm.); form more elongate. (Arizona.) 



ulkei Horn. 

 Vertex without glabrous impunctate area, pubescence never very 

 dense; size smaller (2-3| mm.); form broader. 

 Elytra black with rufous spots or spaces. 



Rufous spot transverse, submedian, nearer the base than the apex, 

 attaining the sides but not or scarcely the suture. 

 Hind legs black, antenna? black except at base, elytral spots less 

 narrowly separated at the suture, size larger — about 3 mm. 

 (New Jersey, Tennessee, Missouri, Kansas.) 



bivulneratus Horn. 



Legs and antennae rufous, elytral spots very narrowly separated 



at suture, size smaller — but little over 2 mm. (Southern 



Arizona.) auctus n. sp. 



Rufous spot variable but normally longitudinal and elongate. 

 Form more depressed, size small (2 mm.), antennae and legs 

 entirely red, rufous spot involving the whole elytron, except 

 a narrow basal margin and the sutural edge ; varies with 

 the elytra black, having a very small diffuse median pale 

 spot. (Southern California.) discopterus n. sp. 



Form stouter, size larger — about 3 mm. — antennae black except 

 at base. 

 Legs red except base of hind femora, elytra in great part 

 rufous, the base, apex and suture, the latter more widely 

 at base, black. (Texas, New Mexico, Arizona.) 



discolor Horn. 

 Four anterior legs rufous, hind legs black. 



Rufous spot of elytra emarginate at sides, prothorax more 

 densely punctate and dull, terminal spur of hind tibia equal 

 in length to the thickness of the first tarsal joint. (Ari- 

 zona, Lower California.) limbatus Horn, 



Rufous spot usually smaller, sometimes confined to the outer 

 apical angle, not emarginate externally; prothorax less 

 densely punctate, shining ; spur of hind tibia short, about 

 half as long as the thickness of the first tarsal joint. (New 

 York to Dakota and Texas.) cruentatus Horn. 



TRANS. AM. ENT. SOC, XXXVI. JULY, 1910. 



