Dr. G. II. Horn on Rhagodera tuberculuta. 295 



Palpi short, last joint of labial oval, acuminate ; Maxillary oval, trun- 

 cate. Epistoma truncate. Labruui transverse, scarcely visible. Head 

 quadrate, lobed over the insertion of the antennae, with supra-ocular 

 ridge; narrowed behind into a neck. Antenua3 11-jointed, moderate- 

 ly robust, one-half longer than the head; first and third joints cylin- 

 drical, the others broadly conical, gradually becoming broader ; last 

 joint smaller than the 10th, rounded and free. Antennae, in repose, 

 received for part of their length, in deep sub-ocular grooves. Eyes 

 round, very prominent and very coarsely granulated. Prothorax as 

 broad as the elytra, moderately convex, with two acute ridges above, 

 cmarginate in front, lobed at middle of emargination, the lobe itself 

 being acutely emarginate between the ends of the thoracic ridges; base 

 with a broad median lobe, emarginate near the angles, sides moderate- 

 ly rounded, serrulate, beneath with a vague impression for the recep- 

 tion of the antennae. Scutellum invisible. Elytra oblong, parallel, 

 moderately convex, base emarginate at middle. Legs moderate; tibiae 

 slender, without terminal spines. Segments of abdomen separated by 

 straight sutures, not emarginate, the 1—4 inclusive with a fovea on 

 each side. 



R. tuberculata. — Blackish-brown, moderately elongate and convex. Head 

 quadrate, coarsely punctured, with lateral impressions, superciliary ridge acutely 

 elevated above the eye. Thorax broader than long, sides moderately rounded, 

 slightly denticulated, posterior angles rectangular. Elytra oblong, moderately 

 convex, rounded at apex, base emarginate at middle, with nine eostse, including 

 the sutural and marginal. The first costa entire, the second and third abbrevi- 

 ated ; interspaces with two rows of coarse, deep punctures. Beneath coarsely 

 punctured. Length .30— .32 inch. 



This insect has been found along the west coast of North America, 

 from Sitkha (Eschscholtz) to San Diego (LeConte), my own specimens 

 being from intermediate points in the Coast range of California, where 

 it does not appear to be very rare. 



B. costata n. sp. 



This differs from the preceding by its somewhat greater size, more 

 depressed form, and greater prominence of all the costas and deeper in- 

 terstitial punctures. The superciliary ridge is not acutely elevated 

 above the eyes. The thorax is more strongly rounded and obliquely 

 narrowed behind; the posterior angles acute and produced backward. 

 The humeral angles of the elytra are rectangular. Length .38 inch. 



I found this species in Arizona, near Gila bend station, under a fal- 

 len branch of Mesquit. 



The authors who have written concerning the Colydiidae, make the 



