126 MEMOIRS ON THE COLEOPTERA. 



eyes only moderate, prominent and at fully their own length from the base, 

 the tempora rounded and similarly prominent, the carinae fine but strong, 

 entire; antennae moderate in length, rather slender, gradually and feebly 

 incrassate, black as usual, the second joint about as long as the first though 

 less stout and much longer than the third, the outer joints moderately trans- 

 verse, the last rather small, pointed but shorter than the two preceding; 

 prothorax small, moderately transverse, parallel, with broadly rounded sides, 

 slightly wider than the head but much narrower than the elytral base, not 

 definitely impressed; elytra large, only moderately transverse, the suture 

 nearly two-thirds longer than the prothorax; abdomen narrower than the 

 elytra, perfectly parallel. Length 1.7 mm.; width 0.45 mm. British 

 Columbia (Glenora), Wickham. 



The two specimens at hand display no indication of distinct 

 male sexual characters. The metasternal projection is rather well 

 developed and sharply angulate, the coxae less approximate and the 

 dividing ridge not depressed, as it is in normal forms of the zoster & 

 type. 



Datomicra wrangeli n. sp. Moderately stout and convex, fusoid, black, 

 the elytra faintly piceous, the legs nearly black, somewhat shining, the 

 punctures close-set and strongly asperate throughout, becoming merely a 

 little less close posteriorly on the abdomen; head small, orbicular, but little 

 wider than long, the eyes at nearly their own length from the base, some- 

 what convex, the carinae entire; antennae rather short and moderately in- 

 crassate, the second joint much shorter and less stout than the first but only 

 a little longer than the third, which is evenly and gradually narrowed basally, 

 the outer joints distinctly transverse, the last small, ogival, not as long as 

 the two preceding; prothorax moderately transverse, parallel and evenly 

 rounded at the sides, much wider than the head and correspondingly much 

 narrower than the elytra, not impressed ; elytra moderately transverse, with 

 feebly diverging sides, the suture nearly one-half longer than the prothorax; 

 abdomen much narrower than the elytra, parallel, almost imperceptibly 

 narrowing apically, the sixth tergite (cf) truncate, simply angulate at the 

 sides, with a small and feeble sinus just within each angle, otherwise un- 

 modified. Length 1.75 mm.; width 0.42 mm. Alaska (Fort Wrangel), 

 Wickham. 



This species again exhibits a marked peculiarity in type of male 

 sexual characters; the metasternum is short and broadly angulate, 

 and the separating ridge is rather broadly convex and scarcely at 

 all depressed. It is separable at once from surgens by the much 

 smaller head. 



Datomicra vaciva n. sp. Subparallel, rather convex, slightly shining, 

 the reticulation dense, very feeble and irregular on the more shining abdomen, 

 the punctures anteriorly minute and inconspicuous, dense and slightly asperate 

 on the elytra, stronger, close-set and asperulate on the abdomen; color black, 



