374 Memoirs on the Coleopteha 



verging in about apical third, the constriction barely traceable; apex 

 distinctly more than half as wide as the base, the lobe of the latter ex- 

 tremely small and feeble; punctures coarse, deep and very close, though 

 not in actual contact throughout, the medium smooth line wholly want- 

 ing; scutellum small, rounded, not shining; elytra two-fifths longer than 

 wide, oval, gradually obtusely acuminate behind, evidently wider than 

 the prothorax and fully twice as long, the humeral callus obsolete; 

 grooves deep, finely, feebly and closely crenulate basally; intervals one- 

 half wider than the grooves, each with a single series of relatively very 

 coarse but separated, perforate punctures, the third wider and with 

 smaller, loosely confused punctures; setae very small though distinct, 

 even, with no condensed spot; abdomen rather coarsely, deeply and 

 somewhat closely punctate, with a distinct oval medio-basal impression 

 in the male. Length (cf ) 2.2 mm.; width 0.8 mm, Missouri (locality 

 unrecorded). 



Differs from suavis in the shorter prothorax, without trace of the 

 narrow subentire median smooth line of that species, also in the 

 smaller basal lobe, and it also differs in the coarser, much deeper 

 and perforate punctures of the interstitial series. The humeral 

 callus is obsolete in ovulum, but is visible, though feebly developed, 

 in suavis. 



Trichobaris Lee. 



This is a large genus, but the species are to great extent confused 

 in collections. The character of the scaly vestiture is comparatively 

 constant in each species, but it is subject to partial or even entire 

 removal. Probably most of the species live on or near the ground, 

 and the constant friction against detritus removes or breaks the 

 scales, so that the general appearance of the insect may be greatly 

 changed; there are several specimens at hand in which almost 

 every vestige of the scaly covering has disappeared, a condition 

 which does not seem to occur among the more arboreal scaly forms 

 of the subfamily. The pygidium is much larger and usually more 

 vertical in the male than in the female. 



The following seven species belong to the mucorea and vestita 

 section of the genus: 



Trichobaris striatula n. sp. — Elongate, subparallel, moderately convex, 

 black throughout, including legs and antennae, slightly shining; beak 

 subsimilar in the sexes, very little longer in the female and about as long 

 as the prothorax, moderately arcuate, punctate, loosely clothed with 

 narrow pale scales above and gibbous at base; prothorax but slightly 

 wider than long, the sides feebly converging, more oblique at apex, 

 deeply and densely punctate, the punctures forming longitudinal rugae: 



