JAMES CHESTER BRADLEY 
255 
inserted on the lateral slope of a raised prominence of the vertex, 
the}' face nearly laterad rather than domad, in most but not all 
species. The forehead is sometimes raised medially above the 
antennae, again flat, and often armed with a transverse row of 
four tubercles, the two lateral sometimes developed into carinae. 
The inferior border of each antennal socket is sometimes thick- 
ened, and produced ventrally into a triangular tubercle, or into 
a flattened curved ridge. The anterior margin of the clypeus is of 
varying form, most frequently emarginate. The mandibles are 
robust, strongly curved, with three teeth, of which the apical is 
the longest. From the inner tooth a carina extends toward the 
base of the mandible, usually in a broad curve, its length and 
shape varying in the species. In three it is elevated into a tooth 
close to the base. The width of the gular orifice varies in differ- 
ent species, and in some it is laterally immargined, in others 
margined, and the margins sometimes produced into prominent 
reflexed processes. The maxillary palpi are six-segmented and 
the labial four. The first three segments of the latter are some- 
times widened and triangular. The antennae are filiform, usu- 
ally crenulated, sometimes very strongly so, as in stygia, some- 
times not noticeably so; occasionally the segments are much 
elongated. I have not noted much variation in their proportions. 
The scape is short, globose and punctate, the pedicel very short, 
hardly half as long as wide; the third segment about one and 
one-half times as long as the scape and equal in length to the 
fourth. The surface of the head is alwaj^s polished and always 
with sparse, usually very sparse and small punctures, some- 
times moderately coarse and less sparse. 
The humeral angles are sometimes prominent, more often not 
in evidence, being entirely rounded. The mesonotum always 
has well marked parapsidal furrows, and is frequently much 
depressed before the scutellum. Its surface is most often 
sparsely, rarely rather densely punctured. The scutellum is sub- 
quadrate, only slightly convex, its disc usually with sparse punc- 
tures, and its sides, like those of the post-scutellum, often with 
minute close punctulations. The mesopleura are always strongly 
convex, and in many species marked with peculiar rugosities, 
sometimes with an impressed basin which ma}' be surrounded by 
a rim or tubercles, while often there is a deep pit near the upper 
TRAN’S. AM. EXT. SOC., XLIII. 
