AMERICAN COMl'ONENTS OF THE TENTYRIINvE 481 



little coarser oil the prosternum than elsewhere. Leii<^th itj.o 

 mm, ; width 5.6 mm. Costa Rica (Chiri(iiii) .,.* squalidus n. sp. 



The single specimen is a female, so that I am unable to de- 

 scribe the secondary sexual characters of the male, which, 

 however, undoubtedly affect the femora as in the preceding 

 genera. This genus will include also such species as Noso- 

 derma zunilcnsis and guatemalcnsts^ and perhaps, though less 

 certainly, vcnusta and lutosa, recently described by Mr. Cham- 

 pion. Guatc7nalcnsis differs from squalidus in its much broader 

 form, smaller, deeper and very much more distinct serial fovese 

 of the elytra, and in the rounded — not conical — subapical tuber- 

 osity at the side margin of each, also in the flat and not elevated, 

 suture. Notwithstanding its much narrower and more elongate 

 form and correspondingly different facies, I believe that Noso- 

 derma sparsa Champ., will enter this genus as an aberrant 

 modification. 



Phellopsis Lee. 



In its ii-jointed antennae, having a broader club composed 

 of three perfectly free joints, less anteriorly narrowed and more 

 transversely parallelogrammic mentum, which is simply obliquely 

 truncate at the apical angles, transversely tumid, dense and 

 coarsely sculptured ligula and complete absence of the remark- 

 able transverse excavation in the apical margin of the penulti- 

 mate ventral segment, characterizing all of the preceding gen- 

 era, Phellopsis is widely isolated. It also inhabits a totall}' dif- 

 ferent zoological faunal region, and its nearest relatives will 

 probably be found in Siberia and Japan. I have been unable 

 to discover any of the singular male sexual characters affecting 

 the femora in the preceding generic types, and do not know of 

 any certain way to distinguish the sexes externally. No new 

 forms have come to light since my recent revision (1. c, p. 44), 

 to which the reader is referred. 



Tribe Usechini. 



In this tribe the body is very small in size, when compared with 



the two preceding, though closely allied in general facies and 



in its coarsely sculptured, rough and subopaque integuments. 



The Usechini differ considerably in structure also, having the 



