614 FAMILY XXV. HISTKRID^E. 



III. TRIBALT-S Erichs. 1834. (Gr., "worthless.") 



This genus contains two small, dull blackish, ovate species, hav- 

 ing the antenna? inserted under the margin of the front, their 

 cavities at the front angles of thorax open both in front and on 

 sides. One of the two occurs in Indiana, 



1172 (3531). TRIBALUS AMERICANUS Lee., Bost. Journ. Nat. Hist., V, 1845, 

 64, pi. IV, fig. 7. 



Broadly oval, convex. Black or piceous, feebly shining, densely punc- 

 tured. Thorax without strife. Elytra with four ill-defined dorsal stripe, 

 the first and second apical, third and fourth basal. Pygidium and propy- 

 gidiuni finely and densely punctured, the former vertical. Length 2.3- 

 2.8 mm. 



Southern half of State; scarce. April 24-June 16. Occurs be- 

 neath bark of hickory, black gum and elm. 



IV. EPIERUS Erichs. 1834. (dr., "pleasing.") 



Small, oblong-oval forms, easily distinguished from Tribal us by 

 the distinct elytral stria?. As there, the antennal cavity is partly 

 concealed by the pectoral plate and is open in front and on the 

 side. Our two species have all the dorsal stria 1 entire. 



3173 (3533). EPIERVS KKGI LAKIS Beauv., Ins., 1805, 180. 



Oblong-oval, convex. Black, shining; legs piceous. Thorax rather 

 sparsely punctate with larger and smaller punctures intermingled. Elytra 

 each with six entire punctured dorsal stria?; intervals sparsely and minutely 

 punctulate; subhumeral entire; epipleural fold coarsely punctured and with 

 two deep, distinct stria>. Length 2.5-3 mm. 



Throughout the Stale; frequent. April 0-September 10. Oc- 

 curs usually in fungi. 



*1174 (3535). EPIERLS PULICAKIUS Erichs., Jalirb., 1834, 102. 



Oval, moderately convex. Dark reddish-brown or piceous, shining. 

 Thorax finely and sparsely punctured. Elytra with six entire dorsal stria? ; 

 subhumeral entire. Epipleura with one fine stria. Length 1.5-2 mm. 



Southern half -of State, common ; less so in the northern coun- 

 ties. February 23-October 4. Gregarious in winter beneath bark 

 and logs in IOAV. moist ground. Easily distinguished from regu- 

 laris by the smaller size, lighter color and one stria of epipleura. 



V. HET^BIUS Erichs. 1834. (Gr., "friendship.") 



Readily known by the peculiar lobe on e;ich side of thorax. 

 Four species are listed from the Tinted States, one of which occurs 

 in Indiana. 



