AMERICAN COMPONENTS OK THE TENTYRIIN/E 475 



riorly, exposing the entire maxillae and ligula, the latter narrow, 

 with the palpi inserted in large latero-dorsal foveae in front of 

 the mentum and wholly exposed, the mentum flat and very 

 coarsely, not densely punctate. The last joint of the maxillary 

 palpi is longer and, especially, much broader, than the third, 

 with its apex compressed and broadly truncate, not obtusely 

 pointed as in the preceding genera. The antennae are per- 

 fectly free, there being no trace of propleural sulcus, and the 

 joints are feebly obtrapezoidal, not very roughly sculptured, 

 the third much longer than the second or fourth, the ninth 

 larger than the eighth, more obtriangular and not transverse, 

 somewhat narrower than the combined last two joints, which 

 are subglobular, with transverse suture and spongiose apex. 

 The surface of the body is not always covered with indument, 

 the integuments frequently being clean and more or less 

 opaque between the small shining tubercles, the vestiture ful- 

 vous. The abdominal excavation occupies at least basal two- 

 thirds of the fifth segment and is nearly as in Noserus. The 

 male has a large and elongate-oval, smooth and feebly convex, 

 finely punctate and subglabrous elevation at the base of the 

 under surface of the middle and posterior femora, a much 

 smaller feeble shining tubercle near the base of the anterior 

 femora, and, sometimes, as in senex^ a smooth punctate bevel- 

 ing at the tibial apex below, the female having no trace of these 

 structures and the femora a little more slender than in the male. 

 The species are very numerous, the type being quite indeter- 

 minate and necessarily to be fixed anew,' but morbillosa and 



^The species named Eurychora tncBqualis by Say, may be definitely described 



and the type reestablished as follows : — 



Form moderately depressed, parallel, nearly as in setiex but larger and with the 

 elytra more gradually, arcuately narrowed behind to the more acute apex, 

 which is more strongly, angularly emarginate at the suture, the angles ob- 

 tusely prominent, black, the vestiture fine, sparse and inconspicuous ; head 

 sparsely punctured, reflexed at the sides as usual, more broadly sinuate at 

 apex than in senex, the prothorax subquadrate, similarly sculptured, ex- 

 cept that the tubercles are smaller and more convex, the sides more an- 

 gulate just before the middle and the basal angles more acute, decidedly 

 diverging and prominent ; elytra similarly sculptured, with smaller and less 

 flattened tubercles, the humeri much more exposed at base beyond the thor- 

 acic angles, the posterior tuberosities much larger and studded more closely 

 and conspicuously with the small shining tubercles ; under surface with 



