PTEROSTICHIN.E 349 



and is usually identified as faber Germ., in collections, but in all 

 available descriptions of faber, including that of the synonymous 

 tenebricosa by Dejean, the elytral striae are said to be fine; they are 

 called "pen marquees " by the latter author. Now in roticollis the 

 striae are conspicuously coarse and deep. The prothorax in roti- 

 collis is fully as long as wide as a rule, but, in describing faber, Le- 

 Conte states that it is transverse. So several species have without 

 doubt been confused under the name faber. In this genus, as 

 represented by roticollis, the head is much less developed than in 

 Anaferonia, the prothorax more elongate and with single fovese 

 and with shorter and feebler basal constriction. The palpi are still 

 more slender and differ from those of any other genus near Evar- 

 thrus in having the fourth joint longer than the third and rounded 

 at tip. Besides unicolor, rotimdatus and brevoorti, which are much 

 larger in size, it is probable that Evarthrus vinctus Lee., will also 

 enter this genus, and the original outline of its characters is given 

 below for comparison. It is highly probable that the Mexican 

 Evartlirus constrictus of Bates, also belongs to this genus. 



Body shining, convex and deep black, the legs rufo-piceous; head three- 

 fifths as wide as the prothorax, elongate-triangular, the neck short; 

 eyes notably large, rather prominent; anterior sulci subparallel, 

 slightly arcuate; antennae fusco-testaceous, blackish basally and ex- 

 tending to the thoracic base; prothorax as long as wide, much wider 

 just before the middle than at apex, the sides evenly rounded from 

 apex to the very short and not abrupt basal sinus, the angles obtuse 

 and not in the least prominent; base broadly sinuate except later- 

 ally, less than three-fifths the maximum width and about three- 

 fourths as wide as the apex, which is feebly sinuate and wholly un- 

 margined, except finely toward the sides; surface smooth, with very 

 few transverse ruguliform lines, the anterior impression feeble and 

 diffuse, the posterior obsolete; median stria deep, biabbreviated, 

 deepest at its posterior end, foveaa single, long , deep, impressed, 

 subarcuately linear, not attaining the base; externally, there is no 

 modification of the surface, but at the basal margin, near the pos- 

 terior puncture at the angle, there is a small isolated rounded punc- 

 ture; elytra oblong-oval, one-half longer than wide, nearly a third 

 wider than the prothorax, the sinus rather short and deep; striae 

 strong and deeply impressed, becoming very fine and almost punc- 

 tureless posteriorly, strongly punctured, the scutellar wanting, the 

 sixth feebler, the seventh very fine, the submarginal very close to 

 the eighth; intervals broadly convex; dorsal puncture at three-fifths. 

 Length (cf 9 ) 12.5 mm.; width 4.2 mm. Florida (locality unre- 

 corded and also taken at Dunedin by Mr. Blatchley). 



roticollis n. sp. 



