12 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.75 



deeply impressed behind the fossae within the somewhat thickened 

 and more or less reflexed lateral margins, deeply and transversely 

 impressed at middle before the basal lobe, continuously so with the 

 lateral impressions. 



Elytra about a third longer than wide, about as wide as the prono- 

 turn, sides parallel in basal three-fifths and slightly arcuato-undulate, 

 thence moderately convergent to apex which is not broadly rounded; 

 base feebly emarginate and adapted to the pronotal base; humeri 

 moderately rounded and not tumescent; surface irregular from rather 

 large incipient oval tubercles, which become most pronounced at and 

 on the upper apical declivity, there are also discernable two lateral 

 and a median one on each elytron, the former being most conspicuous. 

 A small depression within each humerus is usually present. 



Ventral surface of the body pubescent as above. Prosternum not 

 tuberculose although rather irregular, the propleurae obscurely 

 subtuberculose; prosternal process slightly emarginate at apex; metas- 

 ternum somewhat broadly impressed in the central area. Abdominal 

 sutures not excavated, first and second feebly arcuate, fifth ventral 

 not impressed. Legs rather short and slender; tarsi slender. 



Measurements. — Length 3.2 mm.; width 1.4 mm. 



Eolotype.— Cat. No. 28851, U.S.N.M. 



Type locality. — Near Eureka, Humboldt County, Calif. 



Described from a single specimen, a male, deposited in the collection 

 of the United States National Museum, Washington, D. C. 



Collected by H. S. Barber, to whom the species is dedicated. He 

 writes concerning the specimen as follows: The beetle was taken 

 while " sifting leaf-litter in a coniferous woods along a road 2 miles 

 east of the center of Eureka, Humboldt County, Calif. It was 

 taken together with the similarly obscure colydiid MegatapJirus." 



UsecMmorpha harheri stands as an example of what can be obtained 

 by careful sifting, a method of collecting nearly entirely neglected 

 of late. Collectors desire larger and more spectacular things, some- 

 thing to make a show. Sifting may be irksome but it is less strenu- 

 ous. Among the microcoleoptera are found some of the most 

 marvelous and curious forms. 



A synoptical statement of the differential characters for separating 

 the genera and species of the UsecMni described above may be given 

 as follows: 



KEY TO GENERA OF USECHINI 



Antennae with a feebly differentiated club; funicle stout; epistomal region of 

 the head convex; anterior coxal cavities more or less imperfectly closed 

 behind Usechus Motschulsky 



Antennae with a well formed oval club; funicle slender; epistomal region dis- 

 tinctly impressed; anterior coxal cavities widely open behind. 



Usechimorpha, new genus 



