3io MEMOIRS ON THE COLEOPTERA 



has been designated, but Mr. Bates has fortunately indicated those 

 forms which he considers typical (Biol. Cent. Amer., Col., V, p. 179) 

 and I would therefore formally select Nyssodrys deleta Bates, as the 

 type of the genus. On this assumption it becomes possible to give 

 the generic name to our Leiopus haldemani Lee., which has recently 

 been placed in Nyssodrys, but which is not by any means congeneric 

 with deleta. It differs in having a small acute oblique spine at 

 each side of the prothorax very near the base, more convex upper 

 surface of the body and clavate and not gradually thickened femora; 

 the ovipositor is not long but very short, triangular, with rounded 

 apical angle. The lower lobe of the eye is long and suboblong, 

 being but slightly narrower below, the antennse not quite twice as 

 long as the body, the sterna moderately wide between the coxae and 

 the elytra are obliquely truncate at tip. The type is Nyssodrysina 

 haldemani Lee., occurring in Georgia. 



Leiopus Serv. 



Omitting certain well characterized species of larger size, named 

 variegatiis, wilti and setipes, and some smaller and more obese 

 species of the crassulus type, somewhat resembling Leptostylus 

 biustus to external view, such as crassulus, centralis and decorus, 

 which I do not have at hand, there are a considerable number of 

 small and more obscure species clustering about alpha, fascicularis, 

 punctatus and crassulus, which are invariably confused in cabinets 

 but which, on closer study, seem to lend themselves very well to 

 taxonomic treatment as follows: 



Elytra more elongate, twice as long as wide or more, the fascia at or near 

 three-fifths from the base; species eastern in distribution 2 



Elytra not so elongate, less than twice as long as wide, always with more 



compact and conspicuous cinereous vestiture of the general surface, 



the fascia more posterior, at about two-thirds from the base; species, 



excepting mediator, of the southwestern or more essentially Sonoran 



faunas 12 



2 Fascia black bordered anteriorly with cinereous transverse, with 

 an obtuse and feeble anterior sutural prolongation 3 



Fascia oblique, the two forming a very obtuse angle on the suture, always 

 well behind the middle 5 



Fascia much more oblique, the two uniting on the suture at the middle 

 of the length 1 1 



3 Sides of the prothorax oblique anteriorly, from the apex of the large 

 prominent triangular tooth at basal third. Body moderately stout, 



