426 MEMOIRS ON THE COLEOPTERA 



sutural margin which is testaceous. The species throughout the 

 genus resemble each other rather closely and it is very easy to 

 overlook differences which may be of a specific nature. 



Acylophorus Nordm. 



In this genus the front of the head is nearly as in Tanygnathus, the 

 apical margin being truncate and the median part rounded and 

 abruptly elevated above the plane of the lateral angles and the 

 antennae are at the sides of the rounded part; it therefore belongs 

 in all probability to the same tribal group of the Quediinae. It is 

 remarkable in that external indications of sex are almost completely 

 wanting. The male is, however, slightly more slender than the 

 female and the apex of the abdomen has two long anal styles, with 

 an intermediate flat and obtusely acuminate pallid process, not 

 often protruded ; in the female this process is wanting, but between 

 the two long anal styles there are two other styles almost as long 

 though more slender. Species are particularly numerous in the 

 warmer parts of North America, though the genus is widely diffused 

 over the world. 



A species was described by LeConte under the name gilensis 

 but afterward suppressed. At various places about San Francisco 

 Bay, I have taken a species which resembles pronus very closely in 

 form, size and sculpture, but the elytra are less abbreviated and 

 the abdomen bristles with longer, much closer and very conspicuous 

 black hairs; these characters agree very well with what LeConte 

 states regarding gilensis in very few words, and, as I also have the 

 same species from St. George, Utah, taken by Wickham, I am 

 thoroughly convinced that gilensis is a valid species and that it 

 should be restored; it is abundantly distinct from pronus. The 

 two following are also distinct from pronus, though the first is 

 rather closely allied thereto : 



Acylophorus longistylus n. sp. Color, lustre and sculpture very nearly 

 as in pronus but more slender in form, with more acuminate abdomen 

 and much longer anal styles; legs testaceous, the anterior coxse blackish 

 externally, the posterior legs piceous; head similar but more narrowly 

 oval, the neck not as wide, the antennae slightly more slender but other- 

 wise similar, except that the apex is more rapidly though less strongly 

 thickened; prothorax as in pronus but relatively not quite so large; 

 scutellum with few scattered punctures; elytra much less abbreviated 

 and somewhat less coarsely punctured, slighly longer than the pro- 



