302 TERTIARY INSECTS OF NORTH AMERICA. 



made of three nearly equal emarginations, one at the base of each mandi- 

 ble, and one, slightly broader, the emargination of the labrum. These 

 scarcely show on the plate, where the anterior edge wrongly appears, espe- 

 cially on the left side, to be somewhat in advance of the front margin of 

 the eyes. Mandibles large, stout, nearly as long as the head. Eyes small, 

 circular, situated with the antennae at the anterior angles of the head, as 

 distant as possible from the prothorax. Prothorax slightly broader than 

 the head and of the same shape, excepting that the posterior angles are 

 broadly rounded and so not closely connected with the elytra, the humeral 

 angles of which are also rounded. These are slightly broader than the 

 prothorax, somewhat longer than the rest of the body, entire, with parallel 

 sides They are weakly and distantly striate, the striae marked by sparsely 

 arranged erect seta; about as long as the interspaces. Similar setae are 

 scattered sparsely over the head and prothorax and even the base of the 

 mandibles. 



Length of body, 7 mm ; of head and mandibles, 1.75 mm ; of prothorax, 

 1.2 mm ; of elytra, 4 mm ; breadth of head, 2 mm ; of prothorax, 2.35 mm ; of ely- 

 tra, 2.65 mm . 



This species differs so much in its general aspect, and especially in its 

 comparative breadth, the great breadth of the head, and the squareness of 

 the prothorax, from P. cephalotes LeC., with which I have especially com- 

 pared it, that I have hesitated somewhat to place it in the same genus. 

 Casey does not recognize the generic distinction of Parandrita from Lsemo- 

 phlosus, but if this fossil be considered a member of the group there can be 

 little doubt of its value. 



Green River, Wyoming. Four specimens, Nos. 87 (Dr. A. S. Pack- 

 ard) ; 83, 85, 95 (Prof. L. A. Lee). 



Family EROTYLID^E Leach. 

 MYCOTRETUS Chevrolat. 



MYCOTRETUS B1NOTATUS. 



Tl. 7, Fig. 30. 



Mycotnliia linoiata Scudil., Bull.U. S. Geol. Geogr. Surv. Terr., IV, 763-764 (1878); in Zittel, Handb. d. 



Palreont., I, ii, 800, Fig. 1053 (1885). 



A single specimen with its reverse represent the dorsal aspect of this 

 species, which closely resembles M. sanguinipennis Lac. in shape. It is, 



