110 AMERICAN COLEOPTERA. 



Hub. — Florida (Key West). 



Described from a single example in the Horn collection. The 

 form is a trifle less slender than in caularum, but the chief distin- 

 guishing characters are the im punctate surface and the form of the 

 transverse subbasal impression of the pronotum, which is more 

 nearly linear and lacks the two small median fovea?, which are 

 always more or less evident in both pacificus and caularum. 



H. caularum Aube. — Yellowish testaceous, punctuation very fine, but a 

 little closer and more sharply defined than in pacificus; surface polished. Tem- 

 pora very short, merely a raised margin not longer than one-fifth or one-sixth 

 the diameter of the eye ; eyes therefore nearly contiguous to the prothorax when 

 the head is retracted. Hind angles of the pronotum with a fine, short carina 

 exterior to the lateral basal fovese, the discal transverse impression with its two 

 median fovea? nearly as in pacificus, but moresharply defined. Length 1.1-1.3 mm. 



Huh. — Five specimens are before me, one taken by Coquillet 

 (Los Angeles Co.), the others by Dr. Fenyes at Pasadena, flying 

 and under bark in February, and again in September. 



Caularum is much like pacificus, but is at once separable by the 

 polished surface, more distinct punctuation, nearly obsolete tempora, 

 and carinate hind angles of the pronotum ; the lateral fovea? of the 

 pronotum are also longer, deeper and less obviously oblique than in 

 pacificus. 



Tribe II. Dasycerini. 



This tribe contains only the single genus Dasycerus, represented 

 by five' species in the European fauna and two in our own. Not- 

 withstanding the opinion expressed by Mr. Belon, based, it must be 

 confessed, upon a study of the genera of the globe, that Dasycerus 

 should be considered as merely an aberrant member of the tribe 

 Lathridiini, it has seemed to me that the assemblage of characters 

 possessed by this singular genus is worthy of the greater emphasis 

 here accorded it. So far as I can learn all the European writers 

 either assert or assume that the front coxal cavities are closed behind 

 throughout the family. As a matter of fact they are open behind 

 in both Holoparamecus* and Dasycerus. In addition to the open 

 coxal cavities, the prosternal process is lacking in Dasycerus, which 

 in both these respects differs radically from every other genus of the 



* I do not know if this holds good throughout the Merophysiini, but think it 

 very probable. It is so in Merophysia, which is the only genus I have been able 

 to test. 



