GEOLOGICAL SURVEY OF THE TEEEITOEIES. d9d 



sioii on each side of the pronotum. Occasionally, however, a specimen 

 occurs with faint traces of these depressions. Some variation in the 

 width and acuteness of the corium occurs in specimens from both sides 

 of the- continent. 



2. G. extejisa, TJhler, (Proc. Entomol. Soc. Phila., 1863, p. 155.)— This 

 species bears soiCie resemblance to C. marginipennis, Spinola, of Chili ; 

 but it may be at once distinguished from it by the narrower, longer, and 

 more convex head. Our species is found in Dakota, Arizona, Oregon, 

 and California. 



Family Pachycoeid^. 

 Homoemus, Dallas. 



1. B. aeneifrons, Sav, (Long's Expedition, vol. II, Appendix, p. 299;) 

 Pacliycons exilis, H. Schf., (Wanz. Ins., vol. IV., Tab. 110, Fig. 346.)— It 

 was obtained in Colorado, but has been found as far east as Maryland 

 and in New England. 



2. H. hijugis. New species. — Elongate-oval, pale testaceous. Head 

 long, somewhat triangularly narrowing to the tip, the lateral lobes a little 

 rounded, the surface black, brassy, rather finely punctured, clothed with 

 remote, pale pubescence, the lateral margin and a submarginal line 

 yellow 5 tylus a little longer than the lateral lobes; ochro-testaceous, as 

 is also the basal joint of the autennse; the bucculse, adjoining margin, 

 and base of the inferior cheeks, yellow ; rostrum testaceous, reaching to 

 the middle of the second ventral segment, the apexpiceous. Pronotum 

 regularly convex, the lateral margin straight, oblique, the edge smooth, 

 broadly compressed ; the middle of the submargin deeply indented ; the 

 surface remotely, finely, obsoletely punctured with pale fuscous ; each 

 side of middle is a pale fuscous, slightly oblique ray; exterior to this a 

 fainter ray, and sometimes another adjoiuing it, or running from the 

 humerus; callosities occupied by a more or less deep black spot ; the 

 iutra-humeral line deeply impressed, forming a sinus on the postero-lat- 

 eral margin ; the posterior angles moderately rounded ; anterior angles 

 feebly rounded, covering the whole width of the base of the eyes. Pec- 

 tus pale croceous, with uncolored, coarse punctures, with a black spot in 

 the antero-exterior corner. Legs testaceous, punctured on the thighs, 

 having at most but three or four fuscous dots at tip ; spines of tibiae 

 black; tarsi piceous at tip, the nails tipped with black. Scutellum 

 rather long, ovately narrowing to the tip, punctured with brown, faintly 

 clouded at base, and with a darker cloud behind the middle ; the mid- 

 dle line almost wbite, expanded at tip, and bounded there by a blackish 

 line ; each side of base a blackish ray curves obliquely outward to beyond 

 the middle. Tenter yellowish- white, minutely punctured, with a few 

 large fuscous punctures at base and about the disk; connexivum im- 

 maculate and narrowly grooved beneath, the edge sharp ; the superior 

 connexivum black interiorly, exteriorly pale yellowish, faintly punc- 

 tured. The male is much smaller, with the scutellum a little more acute 

 at tip, more or less reticulated with black over the entire uj^per surface, 

 and with at least four longitudinal, faint, fuscous rays on the pronotum, 

 and two oblique oues each side of scutellum. The middle line and its 

 apical dilation faintly indicated. The yellow line of the head is slender, 

 waved, obsolete toward the base, the tylus marked with yellow before 

 the tip. 



Length, $,8; J* , 6, millimeters. Width at base of pronotum, ?,4|^; 

 ^ 4, millimeters. 

 SiJecimens have been received from Colorado and Nebraska. 



