i66 MEMOIRS ON THE COLEOPTERA. 



dota and Ancillota to be subgenera of Acrotona perhaps, but could 

 go no further in way of combination.' 



Coprothassa Thorns. 



In this genus the body is much larger than in any of the preceding 

 allies of Acrotona, the hypomera similarly much inflexed and wholly 

 invisible from the sides, the first four joints of the long hind tarsi 

 equal and the cephalic carinae strong and entire. The middle coxae 

 are slightly separated, the mesosternal process very long, obtuse 

 at tip and, in sordida, extending to the apex of the rather extended 

 metasternal projection, a formation apparently peculiar to the pres- 

 ent genus in the group Acrotonae. I therefore think that Copro- 

 thassa should be considered a distinct genus. Coprothassa sordida 

 is abundant throughout the northern parts of North America, as 

 well as Europe, and it is truly cosmopolitan. The following species 

 differs from sordida in many ways, besides the much smaller 

 antennae: 



Coprothassa smith! n. sp. Moderately stout and convex, gradually acute 

 posteriorly, dull, blackish-piceous, the pronotum paler laterally, the elytra 

 pale brown, the abdomen not paler at tip, the legs pale; micro-recticulation 

 everywhere fine and strong, very fine and transverse on the abdomen, where 

 the stiff setae at the sides and along the apices of the tergites are distinct; 

 punctures fine, close, strongly asperate on the elytra, fine and close 

 on the abdomen, the pubescence decumbent, pale and abundant; head 

 rather small, transverse, parallel at the sides, the eyes well developed, at 

 about one-half their length from the base; antennae slender, only feebly in- 

 crassate, black, paler basally, the second and third joints long, equal, each 

 longer than the first, four to six from distinctly longer than wide to fully as long 

 as wide, seven to ten slightly wider than long, the last slender, gradually and 

 finely pointed, longer than the two preceding; prothorax large, transverse, 

 feebly arcuate at base, the sides strongly converging and strongly, subevenly 

 arcuate from the distinct basal angles to the apex, not quite twice as wide as 

 the head and fully as wide as the elytral base, wholly unimpressed; elytra 

 transverse, with just visibly diverging and feebly arcuate sides, the apices 

 deeply sinuate externally, the suture not quite as long as the prothorax; 

 abdomen at base not quite as wide as the elytra, rapidly and evenly tapering, 

 with straight sides, the fifth tergite one-half longer than the fourth and about 

 three-fifths as wide as the first. Length 3.1-3.4 mm.; width 0.75-0.8 mm. 

 New York (Catskill Mts.). 



The mesosternal process almost attains the summit of the coxae, 

 is narrower and more aciculate than in sordida and does not quite 

 attain the metasternum, which is very broadly obtuse and not 



