1873] '^'^^ [Horn. 



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

 doi'sal stria short, composed almost entirely of punctures. Anterior 

 tibiae 4-, middle 4-, posterior 2-deutate. Length .10-12 inch ; 3.5-3 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 attenuatii^, but with the front less concave, sutural 

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

 dium very sparsely punctured, pygidium nearly smooth. Marginal sti'ia 

 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. 



Tribalister, n. g. 



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

 sternum truncate in front. Antennae inserted under a slight frontal 

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

 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 lamina3. 



The solid club of this insect allies it not only with Retcerius, 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 ScupicceUs 

 it dift'ers 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 Histeridaj, while in ScapicoiUs the form is nearlj'' that of 

 Echinodes. 



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 strife, the outer side of each 

 elevated in the form of an acute carina, which is very strong at aj^ex and 

 gi-adually feebler to base, striae gradually converging to ajjex, sutural 

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

 Pygidium sparsely punctured, shining, propygldium 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 spinidose. Length .08 inch. 2 mm. Plate V., fig. 2. 



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



