426 BULLETIN UNITED STATES GEOLOGICAL SURVEY, 



shining ; the tyhis a little prominent. Eostrain reaching upon the pos- 

 terior coxse, pale yellow, a little dusky at tip ; the basal joint broad, 

 compressed, longer than the head ; second a little longer; third a little 

 the longest. Antennae long and slender, black; the apical joint yellow, 

 with the base blackish ; basal joint highly polished, thickest a little 

 longer than the head; second cylindrical, almost as long as the head 

 and pronotum united ; third a little more slender, filiform, of about the 

 same length as the preceding ; the fourth of the same thickness as the 

 third, a little longer than the basal one. Pronotum short campanulate 

 polished, black, with a quadrate yellow spot on the middle, which sends 

 forward a linear branch as far as to the margin; the coUum constricted, 

 whitish; callosities transversely oval, convexly elevated, with the line 

 between them impressed ; posterior lobe usually separated from the 

 anterior one by a transverse impressed line, sometimes with an obsolete, 

 impressed, longitudinal line on the middle ; posterior margin concave, a 

 little wider than the length of the pronotum ; the humeral angles pro- 

 duced into slightly depressed lobes. Pleurte black ; the posterior ones 

 more or less margined with yellow. Coxse and legs yellow ; the tip of 

 tarsi and the nails pale piceous. Scutellum black, with a yellow spot 

 each side of base. Hemelytra dusky hyaline, tinged with yellow, mi- 

 nutely, remotely, obsoletely punctate; tip of the clavus, inner margin, 

 and posterior margin as far as a brown spot on the costa behind the 

 base of cuneus rufous or pale brown ; cuneus hairy, margined inwardly 

 with ocherous, and with a yellowish-brown tip. Venter yellow, black 

 at tip, minutely sericeous pubescent ; tergum blackish, yellowish ou 

 the disk. 



Length to tip of venter 3i-4 millimeters; to tip of hemelytra 4^-5 

 millimeters. Width of base of pronotum 1 millimeter or less. 



A beautiful, graceful form, of which I swept several specimens from 

 plants in Beaver Brook Gulch, August 7. 



Oeectoderus Uhler. 

 0. amcenus, new sp. 



More slender than 0. ohliquus. Orange-fulvous, polished, not dis- 

 tinctly punctate; the hemelytra dull, excepting the long, cuneiform 

 silvery streak running from the base of the corium. Head longer than 

 wide, polished, narrowed behind the eyes, the width between the eyes 

 scarcely less than the expanse of the collum ; face moderately decurv- 

 ing ; eyes reniform, oblique, blackish, very prominent. Anteunse mod- 

 erately stout, rod-like, the basal joint constricted at its origin, the sec- 

 ond joint very long, infuscated, of even thickness throughout. Eostrum 

 reaching upon the venter, slender, infuscated. Pronotum subcampanu- 

 late, longer than wide, very narrow in front, finely polished, the poste- 

 rior margin concave. Legs long and slender, the tibite and tarsi tinged 

 with piceous. Venter highly polished, orange, a little infuscated, a lit- 

 tle clavate posteriorly. Marginal lines of the corium all around and of 



