1873] -"JJ [Horn. 



Closely allied to the preceding, but smaller and more slender. Fifth 

 dorsal stria short, composed almost entirely of punctures. Anterior 

 tibiae 4-, middle 4-, posterior 2-dentate. Length .10-12 inch ; 2.5-3 mm. 



Occurs in North Carolina and Georgia. 



H. gracilis, Lee. Bost. Journ. V., p. 41, pi. 1. fig. 7 ; Mars. Mon., 

 1857, p. 405, pi. 11, No. 9, fig. 24. 



Similar in aspect to attenuatus, but with the front less concave, sutural 

 stria extending three-fourths, fifth stria extending to middle. Propygi- 

 dium very sparsely punctured, pygidium nearly smooth. Marginal stria 

 of prosternal lobe entirely obliterated. Anterior tibiae 4-, middle 3-, 

 posterior 2-dentate. Length .10-.12 inch ; 2.5-3 mm. 



Occurs in the Middle States. 



TlUBALISTER, n. g. 



Prosternum moderately lobed in front, lobe slightly depressed. Meso- 

 sternum truncate in front. Antenna; inserted under a slight frontal 

 process, front joint moderate, joints of funicle gradually thicker, clnb 

 gradually formed, solid, pubescent, oval and not truncate at tip. An- 

 tennal cavity in the anterior angle of the thorax between the dorsal and 

 pectoral laminae. 



The solid club of this insect allies it not only with Iletcerius, but also 

 with Scapiccelis. In both these genera, however, the club is truncate, 

 and in the former glabrous. The legs are those of Phelister, while the 

 form of the body resembles Tribalus, inasmuch as the margins of the 

 thorax and elytra are continuous and slightly reflexed. From Scapiccelis 

 it differs not only in the form of the legs, but also in the construction of 

 the first joint of the antennas, which in the present genus is that which 

 is usual in the Histeridas, while in Scapicoslis the form is nearly that of 

 Echlnodes. 



T. marginellus, Lee. Proc. Acad., 1859, p. 311. 



Pale reddish-brown, smooth shining. Head shining, supra-ocular stria 

 well marked, frontal stria obliterated, front slightly concave. Thorax 

 twice as wide at base as long, sides feebly arcuate, anterior angles 

 broadly rounded, disc moderately convex, smooth shining, margin slightly 

 reflexed. Elytra as broad as long, moderately convex, smooth shining, 

 apex slightly punctured, margin acute continuous with the thoracic and 

 slightly reflexed, disc with four nearly entire striae, the outer side of each 

 elevated in the form of an acute carina, which is very strong at apex and 

 gradually feebler to base, striae gradually converging, to apex, sutural 

 stria simple extending from apex half to base, epipleune bistriate. 

 Pygidium sparsely punctured, shining, propygidium more densely punc- 

 tured. Prosternum flat, bistriate, stria obliterated at apex. Mesosternum 

 with marginal line entire. Anterior tibiae 5-denticulate, middle and 

 hind tibiae finely spinulose. Length .08 inch. 2 mm. Plate V., fig. 2. 



The curious sculpture of the elytra of this insect has no parallel 



