PHALACRID^; 71 



other differences in form and sculpture of the body, under surface, 

 and, especially of the sterna. In my previous treatment of this 

 pusillus section several distinct species were mutually confounded, 

 and the true pusillus, I find now, was not at hand; a new scheme of 

 classification therefore becomes necessary. Pusillus was repre- 

 sented by two distinct species, one from Florida and the other from 

 Galveston, Texas, here named abbreviates and galvestonicus re- 

 spectively. The true aquatilis Lee., was also unknown to me at that 

 time, as I now discover, the type here named ochraceus having been 

 described under that name. Finally it should be said that two 

 distinct species were confounded in my description of obscurus; the 

 true obscurus is the smaller, blacker and very convex form, which I 

 have taken since at Duluth and near Chicago. The measurements 

 given in this original synopsis (Ann. N. Y. Acad., V.) seem to be too 

 great in most cases, undoubtedly because the scale was thought- 

 lessly held too far above the object being measured. 



The remarkable habits of galvestonicus, as recorded above under 

 that species, could not well have been anticipated, although in it, 

 as well as others of the pusillus section, the hind legs, and particu- 

 larly the hind tarsi, are much longer than the others. 



Leptostilbus n. gen. 



The species of this proposed new generic group have nearly all 

 the characters of Stilbus, except that the second joint of the hind 

 tarsi is greatly elongated, being as in Acylomus, and the plaque 

 behind the middle acetabula is not posteriorly angulate as in 

 Stilbus, but broadly and evenly rounded. The distinct series of 

 semicircular punctures, forming one of the more striking of its 

 external characters, are presaged in several species of Stilbus, such 

 as aquatilis, modestus, attenuates and, it may be said, the pusillus 

 section generally, but there the hind tarsi, though notably long and 

 slender as a rule, have the second joint not or scarcely twice as long 

 as the first. The body in Leptostilbus is notably narrow and elon- 

 gate but this also is a characteristic of some of the pusillus section of 

 Stilbus. The genus is peculiarly southern in range, extending far 

 into Central America, where it is represented by the Eustilbus 

 distinctus of Sharp. 



The three species in my collection may be described as follows: 



