362 Coleopterological Notices, V. 



gate, cylindrical, the second narrower and much shorter ;• third 

 slender, as long as the first. Maxillary lobes small, short, thick, 

 ciliate within ; the palpi small, with the third joint longer than the 

 isecond ; fourth minute. Grular sutures perfectly straight and par- 

 ;allel throughout. Prothorax quadrate, the hypomera narrow but 

 entire, feebly inflexed and distinct from the side. Elytra mode- 

 rate. Abdomen normal, parallel, not at all spinose at apex, the 

 four basal segments feebly, narrowly impressed at base ; fourth 

 and fifth equal and longer than the others. Prosternum rather 

 welLdeveloped before the coxse. Intermediate cox89 small, approxi- 

 mate, the mesosternal process short, angulate. Metasternal side- 

 pieces wide, parallel, the epimera well developed, disappearing under 

 the. elytra at basal third. Legs and tarsi very short, the tarsi 4-4-5- 

 jointed, the basal joint of the middle and posterior slightly longer 

 than the second ; last longer ; claws small, slender. 



This genus is allied to Thectura, but differs in the absence of 

 .caudal spines, in its shorter elytra and metasternum, and especially 

 in the conformation of the metaparapleurae, which in Thectura are 

 quite remarkalble, being narrow and parallel anteriorly, but with 

 the inner margin oblique toward the elytra behind, so that they 

 'become exceedingly narrow at the elytra! apex, the epimera invis- 

 ible. In both of these genera the coxse are unusually small for the 

 ipresent tribe. 



O. pusio n. sp. — Parallel, pale piceous-brown, the head and abdomen 

 darker, blackish, the tip of the latter, legs and antenna paler ; integuments 

 rather shining, coarsely and feebly reticulate, not densely and almost imper- 

 ceptibly punctate throughout ; pubescence rather long and sparse but distinct. 

 Mead just perceptibly wider and distinctly longer than the prothorax, as long 

 as wide, the neck two-thirds as wide; sides parallel; surface with a small 

 impression in the middle between the eyes ; antennse one-half longer than the 

 head. Prothorax nearly one-third wider than long ; sides parallel, nearly 

 straight, the apical and basal angles rounded ; base and apex about equal, 

 arcuate ; disk narrowly and feebly impressed along the median line. Elytra 

 much wider than long, very slightly wider and longer than the prothorax ; 

 sides nearly parallel and straight. Abdomen shorter than the anterior parts, 

 slightly narrower than the elytra, parallel and straight at the sides ; border 

 rather fine. Legs rather stout. Length 1.2 mm. ; width 0.2 mm. 



Indiana. 



One of the most minute of the Bolitocharides, and probably 

 occurring under bark; the unique type is apparently a female. 



