92 MEMOIRS ON THE COLEOPTERA 



remotely resemble Monotoma, the scutellum having a very different 

 outline, the general sculpture being much finer and sparser and the 

 prothorax without prominent basal angles. The first abdominal 

 segment has, behind each coxa, a small angulate plaque, the acute 

 apex of which is prolonged posteriorly in a fine embossed line, but 

 never so far as the hind margin of the segment. In rufipes Lee., 

 this plaque and attendant line become very small in size, and in 

 Europs, which is rather closely allied to Hesperobcenus, it becomes a 

 very variable feature, but when present the plaque does not seem 

 to be prolonged posteriorly as it is here. The following species 

 seems to be distinct from any so far described : 



Hesperobaenus arizonicus n. sp. Male elongate, moderately slender 

 and shining, black, the elytra rufous in nearly anterior half; legs and 

 antennae bright rufous; head large, rather wider across the eyes than the 

 prothorax, reticulate, evenly and feebly convex, the punctures rather 

 coarse, umbilicate, separated, smaller and less close-set medially; eyes 

 small and prominent, about as long as the tempora; antennae extending 

 nearly to the middle of the pronotum, somewhat slender, the third joint 

 as long as the next two, the last funicular joint fully as long as wide; pro- 

 thorax slightly longer than wide, the sides converging from apex to base, 

 broadly arcuate and finely serrulate, the apical angles acutely prominent 

 laterally; surface gradually convexly declivous laterally, even, reticulate, 

 the punctures elongate-oval, coarse, close-set and eccentrically umbilicate, 

 smaller and sparser medially, where there is a partial impunctate line; scu- 

 tellum cordiform, fully as long as wide, very acute at tip; elytra twice 

 as long as wide, but very little wider than the prothorax, the parallel sides 

 evenly and broadly arcuate, the apex arcuately truncate; striae in the 

 form of rather broad and shallow grooves, having small punctures, the 

 flat intervals polygonally and somewhat strongly reticulate; pygidium 

 with rather strong but not very close or coarse punctures; abdomen 

 feebly punctate, the first segment as long as the next three and much 

 longer than the fifth, the longitudinal embossed line extending to apical 

 fourth. Length (cf) 2.7 mm.; width 0.7 mm. Arizona (locality un- 

 recorded). 



Rather closely allied to abbreviates and colored in the same way, 

 but differing from the male of that species in the less slender outline, 

 larger head and longer third antennal joint, coarser punctures, 

 much stronger reticulation of the entire upper surface, more acute 

 scutellum and, especially, in the character of the elytral striae, 

 which have the form of rather broad and shallow grooves in arizoni- 

 cus, but are fine and not wider than the small punctures in ab- 

 breviatus; in both species the setae borne by the punctures are rather 

 long, subdecumbent and much finer than in any species of Mono- 



