Horn.] 446 [Sep. 19, 



tured, along the middle feebly canaliculate. Eyes feebly prominent. 

 Thorax slightly longer than wide, sides nearly straight, feebly divergent 

 behind, base slightly narrower, sub-truncate, disc moderately convex, 

 not densely and moderately finely punctured. Elytra slightly wider than 

 the thorax, parallel, apex broadly rounded, surface moderately convex 

 feebly striate, striae with moderately coarse but not serrate punctures, 

 intervals nearly flat, the sutural with a single row of fine punctures. 

 Body beneath sparsely punctured, first abdominal segment very sparsely 

 punctured, second with a fine row of punctures at both margins. Legs 

 rufo-piceous. Length .10 inch ; 2.5 mm. 

 One specimen, San Diego, California. 



R. angularis Lee. Proc. Acad., 1858, p. 81. 



This species reproduces the preceding in form and sculpture and differs 

 as follow : 



Rostrum not canaliculate, near*apex a very slight fovea. Elytra slightly 

 more robust, punctures coarser. Body beneath more closely punctured. 

 Length .08-10 inch ; 2-2.5 mm. 



Occurs on the Colorado Desert, under willow bark. 



R. eortiealis Boh. Schonh., Gen. Cure. VIII, 2, p. 284. 



" Elongatus sub-depressus, rufo-ferrugineus, nitidus, glaber ; antennis 

 pedibusque dilutioribus, oculis nigris ; rostro capite nonnihil longiori, 

 valido, parum arcuato ; thorace oblongo, anterius angustato, sat crebre 

 evidenter punctulato, dorso obsolete longitudinaliter impresso ; elytris 

 mediocriter punctato striatis, interstitiis subconvexis laevibus." 



Form and appearance of (Cossonus) pallidus, but one-half longer. 



Carolina. Unknown to me. The longitudinal impression of the 

 thorax is a character unknown to me in any of our species. 



Hexauthrum Woll. 

 Funicle of the antennae witti six joints. 



H. Ulkei, n. sp. 



Piceous, moderately shining, subcylindrical. Rostrum narrower and 

 longer than the head, moderately densely punctured. Eyes flat. Thorax 

 as wide as long, slightly narrower in front, sides feebly arcuate, base 

 slightly narrower and sub-truncate, disc moderately convex, coarsely and 

 sparsely punctured. *Elytra slightly wider than the thorax, cylindrical, 

 surface feebly striate, strise with coarse punctures, closely placed but not 

 serrate, intervals flat, each with a single series of fine punctures. Body 

 beneath coarsely but sparsely punctured. Anterior coxae closely approxi- 

 mated. Length .10 inch ; 2.5 mm. 



The antennae are more slender than in Bhyncolus, and reproduce 

 exactly the figure given by Wollaston. Trans. Ent. Soc. Lond. n. s. V., 

 pi. 18, fig. 2. 



One specimen, District Columbia (Ulke). 



