128 MEMOIRS ON THE COLEOPTERA. 



narrower than the elytra, more shining than the anterior parts. Length 

 1.3 mm.; width 0.2 mm. New York (Catskill Mts.). 



Sexual characters are not observable in the type. The species is 

 related closely to the European Microdota inquinula, of which I 

 have several specimens before me, but it is decidedly less minute 

 in all its dimensions and has a relatively larger head and broader 

 prothorax. 



Hilarina n. subgen. 



The minute slender species for which this subgeneric name is 

 proposed, greatly resembles very small members of the subgenus 

 Hilara, but the hypomera are horizontal and warped, so that only 

 a small part is visible from a lateral point of view, precisely as in 

 Datomicra. The middle coxae are well separated, the mesosternal 

 process rather wide and obtusely rounded at tip, extending to the 

 middle of the coxae, where it is separated from the short and ob- 

 tusely angulate metasternal projection, by a long, transversely and 

 moderately convex, somewhat depressed ridge. The hind tarsi 

 are rather short, with the basal joint shorter than two to four, 

 which are equal, the fifth much more slender. 



Datomicra (Hilarina) particula n. sp.- Slender, subparallel, strongly shin- 

 ing, finely and rather sparsely punctulate, the micro-reticulation distinct, 

 very coarse but feeble and irregular on the abdomen; color dark rufo-piceous, 

 the elytra scarcely paler, the head and abdomen black, the latter feebly 

 rufescent basally, the legs pale; pubescence sparse and inconspicuous; 

 head rather large, subquadrate, the eyes well developed, prominent, at a 

 little less than their own length from the base, the tempora less prominent, 

 at first parallel, then broadly rounded to the base, the carinae feeble and ex- 

 tending but slightly beyond the middle; antennae short, rapidly and strongly 

 incrassate, pale in color, the second joint very much shorter than the first 

 but almost as long as the next two, the third obconic, the fourth transverse, 

 the outer joints very strongly transverse, the tenth longer than the ninth, 

 the last very obtuse, as long as the two preceding; prothorax rather strongly 

 transverse, convex, slightly widest before the middle, the sides well rounded, 

 evidently wider than the head and nearly as wide as the elytral base, not 

 impressed; elytra moderately transverse, subparallel, truncate externally 

 at the apices, the suture about a third longer than the prothorax; abdomen 

 much narrower than the elytra, perfectly parallel. Length 1.2 mm.; width 

 0.23 mm. Rhode Island (Boston Neck) and New York (Catskill Mts.). 



The male sexual characters are very feeble, the sixth tergite being 

 truncate or just visibly sinuato-truncate, with the sides of the trun- 

 cature feebly and subacutely angulate. 



