1 68 MEMOIRS ON THE COLEOPTERA. 



prothorax about as long as wide, parallel, the sides straight medially, round- 

 ing anteriorly, the base rounded, the surface with a very large and almost 

 parallel-sided concavity throughout the length, becoming feebler anteriorly and 

 occupying fully median half, distinctly wider than the head and not quite so 

 wide as the elytra, the latter very short, with diverging basally arcuate sides 

 and sinuato-truncate apices externally, the suture barely three-fifths as long 

 as the prothorax ; abdomen parallel, fully as wide as the elytra, the impressions 

 of the first three tergites fine and feeble, the fifth slightly longer than the fourth 

 and (cf) with two short parallel carinae, separated by a fifth the total width 

 and attaining the posterior edge, the sixth at tip with a minute median lobe, 

 having its sides finely and subobliquely carinulate and separated at each side 

 from a short obtuse tooth, having its external edge arcuately carinulate, by 

 a sinus equal in width to the median lobe. Length 2.0 mm. ; width 0.45 mm. 

 Oregon (Lane Co.). 



The remarkable parallel concavity of the pronotum may be 

 wholly, and is almost undoubtedly at least in great part, a male 

 sexual character of this very distinct species. 



Ousipalia Gozis. 



The species of this genus are smaller as a rule than in Sipalia, but 

 especially very short and stouter, not slender and elongate as 

 they are in that genus. In the European catalogue it is set down 

 as a subgenus of Sipalia; it is poorly represented in Europe but in 

 America is a very much larger group than Sipalia. 



Ousipalia tartarea n. sp. Oblong, parallel, moderately convex and shin- 

 ing, blackish-piceous, the elytra but little paler, dark brown in color, the 

 head and abdomen polished, black; punctures very fine, rather sparse, 

 the micro-reticulation subannular in arrangement around the punctures, 

 on the abdomen very coarse but almost obsolete; pubescence very sparse, 

 short, rather stiff; head large, wider than long, very feebly dilated basally, 

 the eyes well developed, at a third more than their own length from 

 the base, rather convex and very coarsely faceted, the carinae fine, visible 

 only at base; antennae piceous, paler basally, rather short, gradually and 

 moderately incrassate, the second joint scarcely shorter than the first but more 

 slender, distinctly .longer than the third, the fourth slightly, the outer joints 

 rather strongly, transverse, the last pointed, as long as the two preceding; 

 prothorax transverse, distinctly wider than the head and as wide as the 

 elytral base, widest well before the middle, the sides subparallel and rounded, 

 the median line finely and somewhat deeply impressed throughout ; hypomera 

 well inflexed, not visible from the sides; elytra moderately transverse, with 

 feebly diverging, straight sides, not sinuate externally at the apices, the 

 suture very slightly longer than the prothorax; abdomen short, parallel, 

 as wide as the elytra, the fifth tergite slightly longer the fourth; middle 

 coxae contiguous, the short and very acute mesosternal process separated 

 from the transverse and feebly arcuate metasternum by a long, deeply ex- 



