Coleopterological Notices, VII. 499 



the metasternal side-pieces are nevertheless not visible ; the meta- 

 sternum is more pubescent anteriorly and the male sexual char- 

 acters at the ventral apex moderately developed. 



1. US, tenuis n. sp. — Narrow, very convex, slightly ventricose, highly 

 polished and impunctate, very pale luteo-testaceous throughout, the antennae 

 ^nd legs still paler ; integuments translucent ; pubescence sparse, short, pale, 

 evenly distributed throughout, even, coarser and recurved on the elytra. Head 

 as long as wide, evenly convex, the eyes small, situated before the middle and 

 down on the sides, feebly convex and not at all prominent, the tempora very 

 long, only feebly convergent and slightly arcuate behind them to the neck. 

 Antennse as long as the head and prothorax, slender, the club rather abrupt, 

 distinct but not strong ; second joint only slightly shorter and narrower than 

 the first, a little thicker than the following, feebly obconic, % longer than 

 wide ; third to sixth equal in width ; third distinctly, fourth and sixth very 

 slightly, shorter than wide ; fifth distinctly longer than wide ; seventh wider 

 and much longer than the eighth, slightly distorted, rather longer than wide, 

 % wider than the sixth ; eighth small and transverse ; ninth and tenth feebly 

 fusiform, f^ and once wider than the eighth, }4 ^^^ % wider than long ; 

 eleventh short, conoidal, not oblique, as wide as the tenth, only slightly longer 

 ■than wide and much shorter than the two preceding. Prothorax as long as 

 wide, scarcely }^ wider than the head, widest slightly before the middle, the 

 «ides evenly arcuate ; base arcuate, without distinct angles ; disk evenly con- 

 vex, wholly unmodified. Scutellum small, parallel, longer than wide, ob- 

 tusely rounded at apex. Elytra fusiform, gradually and acutely pointed behind, 

 ■widest just before the middle, with the sides evenly and strongly arcuate, 

 nearly % longer than wide, 2}4 times as long as the prothorax and % wider, 

 •each with two extremely small and feeble impressions at the basal margin ; 

 surface strongly, evenly convex, without trace of sutural impressions, the 

 suture finely beaded in basal sixth or seventh, the bead enveloping the 

 scutellum. Extreme tip of the dorsal pygidium exposed and broadly rounded. 

 Legs moderate in length, rather thick, the femora feebly swollen, the anterior 

 more strongly; hind tarsi nearly % as long as the tibiae, the four basal joints 

 almost exactly equal, the fifth slightly thicker, rather longer than the two 

 preceding. Length 0.75 mm. ; width 0.26 mm. 



Pennsylvania (Westmoreland Co.). 



The specimen described above is presumably a male, the tip of 

 the abdomen being narrowly rounded and the apparatus within 

 the dorsal and ventral plates, which are widely opened, quite com- 

 plicated ; there are visible on inferior rounded ligula and a supe- 

 rior upturned spatulate member within the opening. The four 

 basal segments are subequal in length. The female is similar to 

 the male, but has the abdominal vertex broadly and obtusely 

 rounded. 



