AMERICAN COLEOPTERA. 00 



Mas antennid longe pcctinatis,, artieulo 3io sequentibus 4 acquali,ramo elon- 

 gato tenui basali externo munito, sequentibus brevibus transversis extrorsum 

 in ramos valde elongatos productis. Fcmina latet. 



Ten male specimens were collected on gramma grass at the crossing of 

 Tccalote creek, south of Las Vegas, New Mexico. We sought tliligentlj 

 for the females, but without success. In comparison with Bvuniocera 

 Da/ijurii, besides the generic distinctions above mentioned, the punc- 

 tuation is much fia-er. and the pubescence shorter, finer and more seri- 

 ceous. 



I desire in the name of this beautiful and interesting addition to our 

 fauna, to commemorate the ability of Gen. W. W. Wright, the Chief 

 Engineer and Commander of the Survey on which the species described 

 in the present memuir were collected. Ilis attention to the comfort 

 and safety of the party while traveling through a hostile Indian coun- 

 try will not be soon forgotten by any of his companions; while the 

 skill with which the more difficult portions of the route were examined, 

 and the labors of his assistants directed to the most easy methods of 

 surmounting the difficulties, will commend itself to every admirer of 



coi'rect engineerintj;. 



,(ii :<.■..;■'--, . " TACHYGONUS Schonh. 



T. centralis, brevissime ovatus, niger nitidus, setis gi'iseis erectis vestitus, tho- 

 race puree fortiter punctate, lateribus parce pallida piloso, versus angulos posticos 

 fasciculopallidoornato; elytris grosse seriatim punctatis, faseiculo pallido post- 

 seutellari ornatis ; mctasterni lateribus albopilosis, antennis testaceis, tarsis Tion- 

 iiuiiquam testaceis. Long. I".') mm. 



Trinchera Pass, on JRhus aromaft'cum. With the exception of the 

 white hairs on the sides and at the posterior angles of the thorax, the 

 fasciculus behind the scutellum, and the less dense white hairs of the 

 sides of the metasternum, the body and legs are clothed with erect 

 bristles which appear black except in certain lights, when they appear 

 dark gray. The rostrum is smooth and shining, with a row of strongly 

 marked punctures above the antennse and a few scattered punctures on 

 the side; head thickly punctured, eyes almost confluent. Thorax 

 sparsely but strongly punctured. Elytra with rows of very large 

 punctures, intervals marked with a series of setiferous punctures and 

 a few transverse wrinkles; a well defined bunch of white erect hairs 

 on the suture just behind the scutellum. Antennae testaceous, or 

 yellow ; tarsi sometimes testaceous, sometimes blackish. Hind femora 

 armed beneath with five or six small teeth. 



DONACIA Fabr. 

 D. pubescens, elougata, ferruginea, supra pube sericeo-aurea dense vestiia. 

 thorace quadrato, medio utrinque paulo constricto, dorso late canaliculato, an- 

 t.ico posticeque vage impresso, tuberculis latis parum prominulia; elytris dorso 



