272 



The speciaieu described by Mr. Say was a mutilated one, without a 

 head. It may not belong to the genus to which it is here referred; but 

 as it has been placed by its describer in Thyreocoris, it must be at least 

 somewhat related to the genus Corimelama. 



The description is copied here with a view to call the attention of col- 

 lectors to this remarkable insect, and to enlist those who are favorably 

 situated to endeavor to recover it for the advancement of our knowledge 

 in this branch of modern science. 



Family PACHYCOEID^. 



HoMCEMUS, Dallas. 



1. H. ceneifrons. 



Seuiellera ceneifrons, Say, Long's Esped. appendix, 299, No. 2. 

 Pacliycoris exiUs, H. Schf., Wanz. Ins. iv, tab. 110, fig. 346. 



Inhabits Colorado, and the Atlantic region generally from Canada to 

 Virginia. It occurs but rarely in Maryland, and seems to affect the 

 colder parts of the State, where the vegetation is from a week to ten 

 days later in developing than in the lowlands of the warm areas. 



2. S. Mjugis. 



Homcemus hijugis, Uhler, Hayden's Geol. Surv. of Montana, 393. 

 Collected by the survey of 1S71 in Colorado, and during 1873 by Lieu- 

 tenant Carpenter, from the foot-hills of Colorado, in September ; vicin- 

 ity of Denver City, by B. H. Smith ; also received from Dakota and 

 Nebraska. 



3. S. consors. New sp. 



Testaceo-fulvous ; pale yellowish beneath ; more acute at both ends 

 than H. (vneifrons. Head more triangular and narrower, more finely 

 punctured, sparingly pubescent, less convex ; the surface brassy-black, 

 greenish at base ; the lateral submargin with a narrow yellow line ex- 

 tending to the apical margin each side of tylus ; the lateral margins 

 distinctly siuuated ; antenniE and rostrum testaceous, with the tips fus- 

 cous. Pronotum testaceous, tinged ^ith brown, finely and obsoletely 

 punctured ; the lateral margins rather broadly compressed ; each side of 

 disk with a forked fuscous ray, the ends diverging posteriorly ; exterior 

 to this anteriorly is a short fuscous line, on the middle a fainter fuscous 

 line, and a similar one along the submargin ; the spot in the anterior 

 angles very distinct. Scutellum very much narrowed obliquely posteri- 

 orly, very finely, rather obsoletely punctured ; on the base is a trifarjous 

 black spot, the middle end of which runs to a point a little way back ; 

 the lateral ends indistinctly connected with a gradually narrowed ray, 

 which runs obliquely backward; each side of base with pale streaks, 

 exterior to which is an angular, fuscous spot; on the middle is an inter- 

 rupted pale line; and on the tip an oblong pale spot, which narrows to a 

 point anteriorly, and placed on a fuscous cloud. Venter pale, remotely, 

 finely punctured ; the punctures denser and finer on the sides ; the sixth 

 segment strongly carinated on the posterior margin ; connexivum supe- 

 riorly, with a black spot on each segment. 



AuLACOSTETHUS, Uhler. 

 A. simulans. New sp. 



Oval; moderately long; convex in both diameters; testaceous; clouded 

 with ochreous; densely, minutely punctured with fuscous. Head ochre- 

 ous, confluently, and more coarsely punctured ; the lateral edge iuferiorly 

 and the tylus at tip smooth, yellow; lateral margins deeply sinuated; 



