80 OTIOEHYNCHID^E. 



[Horn. 



suture. Intercoxal process broad, truncate, second segment of abdomen 

 much longer than the two following together, separated from the first by a 

 strongly arcuate suture. Tibiae feebly mucronate, corbels of hind tibiae 

 open. Body scaly and with short black hairs. 



D. sordidus, n. sp. 



Form oval, robust, surface moderately densely covered with dark cine- 

 reous scales, discolored dark-brown by exudation, and with very short 

 dark-brown hairs. Head and rostrum as long as the thorax, densely scaly, 

 and with few short hairs. Thorax oval, broader than long, slightly 

 narrower in front, sides regularly arcuate from apex to base, apex truncate, 

 base feebly arcuate, disc convex, densely punctured and scaly, scales im- 

 bricated, paler in color along the median line and sides, and with very 

 short dark-brown hairs sparsely placed. Elytra broadly oval, broader at 

 base than the thorax, very feebly emarginate at middle, humeri broadly 

 rounded, disc convex, finely striate, striae not punctured, intervals flat, 

 densely scaly, each interval with two rows of very short, black, semi-erect 

 hairs. Body beneath and legs less densely scaly and very sparsely hairy, 

 tibiae sparsely fimbriate within. Length .16- .24 inch ; 4-6 mm. 



This insect resembles in form and size Phyx.elis rigidus. The color 

 varies in accordance With the exudation, some being very dark cinereous, 

 others very dark-brown. The males are slightly more elongate than the 

 females, and the sides of the elytra less arcuate . 



Occurs very abundantly in the desert regions of Arizona under damp 

 logs, and was also collected by Mr. Crotch at Frot Mojave, California. 



DIVISION II. 



In this division are contained all those genera in which the mesosternal 

 side pieces are diagonally divided into two nearly equal pieces, the outer of 

 which (epimeron) cuts off the inner (episternum) from any contact with 

 the elytral margin. The metasternal episternum is usually moderately 

 broad, the suture distinct in its entire length, rarely narrow, and in one 

 genus the suture is entirely obliterated. In every case, however, the 

 anterior end of the metasternal episternum is suddenly dilated, causing on 

 one side an emargination of the elytral margin (which is, however, evan- 

 escent), while on the inner side an acute triangular process of varying 

 length occupies a space between the mesosternal epimeron and the body of 

 the rnetasternum. 



The antennal scrobes vary in form, position and extent. The mentum 

 is, in all of our genera, at least moderate and visible, excepting Eudiagogus 

 and Coleocerus where it is small and much retracted, allowing the parts of 

 the mouth to be visible. The beak at tip exhibits two distinct forms. In 

 the one the genae are rather deeply notched and allow the base of the man- 

 dible to be exposed ; in the other there is no emargination or a very feeble 

 one. Accompanying these latter characters we have the upper portion of 

 the beak more prolonged over the mandibles above in the former case, 



