1894.] Entomology. 817 
Mandibles stout, rather long, curved, with a strong, rounded tooth 
before the middle. 
Maxillz composed of a long, stout basal piece, heavily bristled, es- 
pecially on the inside, a shorter second joint, which bears a one-jointed 
appendix, tipped by a bristle, on the outside; third, fourth and 
fifth joints subequal, the last two, however, a trifle longer and more 
slender. 
Mentum borne on a tuberculiform base, elongate, wider near the tip, 
palpi two-jointed terminal joint longer. 
Prothorax corneous, transverse, sides and base somewhat rounded, 
apex nearly truncate, median line distinct, rather deep, a deeper i impres- 
sion each side external to which isa vague foveate impression. Beneath 
with two deeply impressed lines strongly convergent anteriorly, poste- 
rior to which are two foveæ. 
Meso- and metathorax much shorter than the prothorax, membran- 
ous with a long, crescentic, horny scute at middle, both above and be- 
low, and smaller ones at sides. Each of these segments bears a lateral 
bristle. 
Abdomen of nine segments, which are protuberant near the middle 
of the sides and transversely wrinkled, armed with two lateral and one 
ventro-lateral bristle on each side. Each segment except the last is 
granulato-spinose on the scutes of the under surface; the last bears two 
bi-artieulate appendages, each armed with five bristles, as shown in the 
figure. The anus is inferior. 
Spiracles in nine pairs, the first situated beneath the anterior meso- 
thoracic angles, the others in segments 1 to 8 of the abdomen, near the 
anterior margins and somewhat ventro-laterally. 
Legs small, weak. slender. The cox are rounded, imperfectly chit- 
inized, the trochanter distinctly marked, femur somewhat creased on 
the edges, tibi: shorter, slightly bristled, claw single with two short 
bristles at about the middle of the length 
The pupa is white, 10 mm. in length and of the same general shape 
as the beetle, but with a more pointed abdomen; the meso-metasternal 
area is coarsely punctured. 
Nearly full-grown larve of this species were found under the bark 
of an old cottonwood log near the end of March, between the thin 
layers next to the wood. In captivity they fed upon the pups of 
Diptera taken in the same situation. After several days the largest 
one constructed a case of small pieces of bark; the dimensions were 
14 by 7 mm., the outside rough, but the inside perfectly smooth. In 
this case the change to a pupa took place after a rest of above a 
week. 
