370 BULLETIN UNITED STATES GEOLOGICAL SUEVEY. 



outer edge and with a few more sleader and very oblique teeth on the 

 under side near the inner margin (anterior femora sometimes with a 

 stout tooth near the base, bifid at tip). Corium broad and short, sinu- 

 ated on its posterior margin, the costal margin arcuated posteriorly, the 

 epipleura slender, but protracted almost to the tip of the corium; mem. 

 brane long, with three or four longitudinal indistinct nervures. 



1. A. spinifro7is. 



Cijdnus sp'mifrons Say, Jouru. Acad. Phila., iv, 316, No. 2. 



Chestnut-brown ; oblong-subquadrate. Head longer than wide, coarse- 

 ly, unevenly punctured, ciliated and tuberculated, the tylus prominent 

 and convex, carried back narrower almost to the base of the head. An- 

 tennae, rostrum, and legs pale ferruginous, the former slender and 

 long, the basal joint a little longer than the second, which is very short 

 and slender, third slender at base, but gradually'- enlarging toward the 

 tip, longer than either of the others, and about equal to the second 

 and fourth united, the fourth and fifth subequal, attached by very 

 slender bases. Kostrum reaching up on the posterior coxse, becoming 

 slender toward the tip, the basal joint longer than the head, second a 

 little longer, hairy, very slightly compressed, not much stouter than the 

 third, third much longer, fourth slender, a little shorter than the second. 

 Pronotum subquadrangular, the lateral margins straight and parallel, 

 the anterior margin not deeply sinuated next the head, edged with a 

 narrow, smooth seam, the angles bluntly rounded ; posterior side a little 

 arcuated, the margin high and convex, a little sinuated interiorly to 

 the prominent, smooth, humeral angles; the surface polished, vario- 

 losely, closely punctate behind the transverse line, a little more finely 

 and densely so each side and behind the head ; disk of the anterior lobe 

 very finely and sparsely punctate, and the posterior submargin with 

 finer and remote punctures ; the sides remotely ciliate. Anterior tibise 

 with five stout piceous teeth and four finer ones on the outer edge ; 

 posterior tibiae long, very slightly curved, slender, armed with few and 

 slender spines. Pro- and meso-pleurte pale chestnut-brown, highly pol- 

 ished; ostiolar canal very high, narrow, and long, placed on a dull, dark, 

 rugose episternum. Scutellum convex, remotely, moderately, coarsely 

 punctate. Corium highly polished, a little paler than the pronotum, 

 coarsely, deeply, closely punctate, excepting on the middle of the poste- 

 rior submargin and discal areole ; punctures of the clavus-sutures finer ; 

 membrane white, protracted much behind the abdomen. Veuter pale, 

 minutely, densely scabrous and closely pubescent. Epimera of the meta- 

 stethium produced backward over the base of the abdomen !n siilooth, 

 triangular ilaps. 



Length 4 millimeters. Width of base of pronotum 2 millimeters. 



Occurs in many parts of the United States. Mr. Say found it first in 

 Missouri ; since then it has been brought from Texas, Illinois, Indiana, 

 Michigan, Pennsylvania, and Georgia. I have found it twice in Mary- 



