310 COLEOPTERA OF NORTH AMERICA. 



Tribe XVI.— jVECYI>ALI]¥I. 



Head large, suddenly, but not very deeply constricted far 

 behind the eyes, which are finely granulated, large, oblique, 

 deeply emarginate ; the front is very large, quadrate, and vertical, 

 the gensc long, and the hypostoma limited each side by an oblique 

 ridge ; the antennae are inserted high up on the top of the front 

 between the eyes ; the mandibles are small, stout, pointed, and 

 fringed with hair on the inner margin; the palpi are very short, 

 the last joint oval and deeply impressed in Uloehffites, bell- 

 shaped and feebly impressed in Necydalis. Antennse filiform, 

 longer in % ; 2d joint small ; 3d and 4th united not longer than 

 th(j 5th in Ulochajtes; 3d and following joints equal in Necydalis. 

 Pr^thorax deeply constricted before and behind, and tuberculate 

 on the sides. Scutellum elongate, triangular; stridulating plate 

 of mesonotum large, undivided. Elytra very short, dehiscent, 

 se^jarately rounded at tip ; dorsal segments exposed, entirely 

 corneous ; wings not folded at tip, but lying straight along the 

 abdomen. Prosternum very short in front of the coxte, narrow 

 between them, coxae large, conical, prominent, nearly contiguous, 

 cavities angulated externally, closed behind ; mesosternura sub- 

 triangnlar, truncate behind; coxoe prominent, cavities open ex- 

 ternally; metathoracic episterna wide in front, narrowed behind; 

 hind coxae prominent, nearly contiguous. Abdomen gradually 

 narrowed behind and nearly pointed in 9, slightly thicker at the 

 extremity in % ; ventral segments equal in length, 5th in Z 

 broadly emarginate. Legs slender, hind pair much longer, tibial 

 spurs small, tarsi narrow, 1st joint elongate, not brush-like be- 

 neath, in front pair equal to 2d and 3d united, in middle pair 

 equal to all the others united, in the hind pair much longer. 



This tribe is represented in our fauna by Necydalis mellitus 

 Say in the Atlantic, two species of the same genus, and Ulochsetes 

 leoninus in the Pacific States. The latter is a large, robust, and 

 Tery hairy insect, which is well figured in the Pacific R.R. 

 Explorations, vol. xi. pi. 2, f 12. 



The undivided stridulating plate is an exception in the Leptu- 

 roid series, to which we have attached this remarkable tribe, and 

 with which it has very strong relations. It would perhaps be 

 better to view it as representing a separate series, in which might 

 be placed various foreign tribes in which the wings are not folded 



