318 LE CONTE.— LONGICOEN COLEOPTERA 



1. D. PALLiATus, — Cyaneus, thorace rugose-punctato, elytris dense punctatis, ante medium flavis, puncto 

 utrinque basali, scutelloque nigris. Long. -92. 

 Hald. 58. 



Ceramhyx palliatus, Forster. 



Desmocerus cyaneus, Dej. Cat. : Serv. Am. Ent. 4, 202, 

 Stenocerus cyaneus, Fabr. EI. 2, 305. 01. 69, 3, 26. 



Massachusetts to Georgia : on Samhucus niger. In the male the antennae are more 

 nodose, the yellow portion of the elytra is smaller, and the blue extends farther upon 

 the suture. 



Group 2, 



In this group the front is not suddenly deflexed : the head is sometimes elongate, 

 with the mouth produced ; it is never very deeply constricted behind, and is often but 

 very slightly narrowed behind the eyes, which are not deeply emarginate. It differs 

 from the next group by the position of the antennae, which are either in front of the 

 eyes or on a line with the anterior margin. The palpi are compressed and more or 

 less dilated. This group seems to verge towards the Priojiidce (in Piodes) and to be 

 closely related to Donacia in some other genera. 



PIODES. 



Oculi vix prominuli, intus paulo emarginati. 



Mesosternum subtriangulare postice truncatum. 



Labrum brevissimum deflexum. 



Corpus crassum obesum, supra glabrum, coriaceum. 

 Caput basi non constrictum, mandibulje edentatse : mentum transversum trapezoidale, ligula antice paulo 

 emarginata, lobis apice rotundatis. Palpi desunt. Antennse ante oculos sitee, breviusculse, articulis 

 5-11 sequalibus, 4'" paulo breviore, 3 iterum longiore. Thorax brevis utrinque modice constrictus, 

 lateribus acute tuberculatus. Elytra postice non attenuata, apice rotundata. Tibiae apice intus oblique 

 truncatse, calcaribus paulo ante apicem sitis. 

 1. P. coRiACEA. — Nigro-picea, parum nitida, capite thoraceque confertissime rugose-punctatis, elytris rugosis. 

 Long. -75. 



Oregon. Mr. Wilcox. One specimen with the palpi wanting. The whole 

 appearance of this insect is that of a Prionide ; it differs, however, essentially by its 

 immarginate thorax, and conical anterior coxae. 



Head quadrate, very densely rugosely punctured, eyes scarcely prominent. 

 Mandibles rather long, edentate. Antennae scarcely longer than the head and thorax, 

 thorax wider than long, very densely rugosely punctured, dorsal line finely 

 impressed. Elytra twice as wide as the thorax, one-half longer than wide, truncate 

 at base, dilated a little behind the middle, rounded at apex, densely rugous, with a 

 few scattered punctures. 



