260 Memoirs on the Coleoptera 



similar long scape, the first funicular joint relatively longer, exceeding the 

 next two, the outer joints more compact and distinctly transverse, the club 

 narrowly cylindric-oval, as long as the preceding five joints; prothorax fully 

 a fourth wider than long, the sides more strongly arcuate, becoming parallel 

 and feebly arcuate in nearly basal half; tubulation longer and more con- 

 stricted, fully half as wide as the base; surface with the infinitesimal punc- 

 tures of the preceding becoming unusually distinct and less remote laterally; 

 basal line feebly eroded, the lobe not evenly rounded as in the preceding, but 

 having a feeble apical sinus; scutellum quadrate, wider than long; elytra 

 but little over a fourth longer than wide, nearly as in the preceding but 

 rather more narrowly rounded at apex, and with the micro-punctulation 

 laterally more evident and closer; squamose line relatively shorter, a fourth 

 the total length; male abdomen feebly impressed medio-basally and with 

 fine, sparse punctures, each bearing a very fine whitish hair-like squamule, 

 these wanting behind the coxae; prosternum nearly similar, but with the 

 erect spines very short; anterior tibiae fimbriate internally toward apex. 

 Length 3.65 mm.; width 1.85 mm. Brazil (Chapada — campo). October. 



One male specimen mediocris n. sp. 



13 — Form elongate and rhombic-suboval, deep black, smooth and polished; 

 dense yellowish-white scales of the prosternum sometimes ascending to the 

 lateral part of the tubulation above, the pronotum also with a small lateral 

 patch at base; sides of the metasternum, the met-episterna and sides of the 

 last four ventrals also densely scaly; elytra with a large transverse basal 

 area, from the scutellum to the fifth or sixth stria, also covered with dense 

 whitish scales; beak (cf) evenly arcuate, gradually tapering, coarsely, 

 densely punctate at the sides and as long as the elytra, smoother and more 

 cylindric distally, or ( 9 ) shorter than the elytra, more sparsely but coarsely 

 punctate basally, the thin smooth apical part occupying more than half the 

 length; antennae submedial (9), near two-thirds (cf), the club cylindric 

 and long but shorter than the funicle in both sexes; prothorax a fourth (cf) 

 to third ( 9 ) wider than long, the converging sides feebly, subevenly arcuate, 

 the tubulation and head much broader in the female; scutellum small, 

 subquadrate, free; elytra triangular, with strongly rounded apex, a third 

 longer than wide; grooves deep, unusually punctate, the intervals feebly 

 convex; surface somewhat undulated; male abdomen with a large rounded 

 medio-basal area, flattened and closely clothed with slender fulvous squam- 

 ules, the prosternal spines short, separated by a large circular perforation. 

 Length 5.0-5.2 mm.; width 2.35-2.7 mm. Venezuela. Two specimens 

 from Desbrochers des Loges and as named by him bisignatus Jekel 



Some of the species allied to armatus, having two squamose lines 

 on each elytron, are difficult to discriminate; armatus itself, as here 

 described, is quite distinct from the others in the abdominal sexual 

 characters of the male, and reductus, in the very short external line 

 and small size. The intraspecific constancy of these squamose 

 areas in form and extent is very remarkable, and affords an efficient 

 specific index. 



Dimesus Pascoe 



The body in this genus is of rather more oval form than in 

 Cylindrocerus, the body, as a rule, in great part shining and glabrous, 

 and such vestiture as may appear is very different in character and 

 distribution. In the typical species conforming to the Parana 



