318 
LE CONTE.—LONGICORN COLEOPTERA 
1. D. palliatus, — Cyaneus, thorace rugose-punctato, elytris dense punctatis, ante medium flavis, puncto 
utrinque basall, scutelloque nigris. Long. *92. 
Hald. 58. 
Ceramhyx palliatus, Forster. 
Desmocerus cyaneus, Dej. Cat.: Serv. Am. Ent. 4, 202. 
Stenocerus cyaneus, Fabr. El. 2, 305. 01. 69, 3, 26. 
Massachusetts to Georgia : on Sambucus 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 PrimidcB (in Piodes) and to be 
closely related to Donacia in some other genera. 
PIODES. 
Oculi rix prominuli, intus paulo emarginati. 
Mesosternum subtriangulare postice truncatum. 
Labrum brevissimum deflexum. 
Corpus crassum obesum, supra glabrum, coriaceum. 
Caput basi non constrictura, mandibulae edentatse : mentum transversum trapezoidale, ligula antice paulo 
eraarginata, lobis apice rotundatis. Palpi desunt. Antennae ante oculos sitae, breviusculae, 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 
truncatae, calcaribus paulo ante apicem sitis. 
1. P. CORIACEA. —^Nigro-picea, parumnitida, 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 coxte. 
Head quadrate, very densely rugosely punctured, eyes scarcely prominent. 
Mandibles rather long, edentate. Antennte 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. 
