190 Journal New York Entomological Society. [Vol. xx\'iii 



Stenus fulvoguttatus luw species. 



Form somewhat rol)ust. Pubescence \ery short, distinctly visible only on 

 the abdomen : color whitish. Head large, twice as wide as long ; interocular 

 surface strongly depressed, twice the width of the eye, median convexity broad 

 but narrower than the lateral declivities ; punctures of moderate size, sepa- 

 rated by about one half their diameters; ocular lines meeting at three lengths 

 in advance ; antennse longer than the width of the head, very slender ; third 

 joint nearly as long as the next two, four to seven decreasing very slowly in 

 length, seven very elongate, eight one half longer than wide, nine as wide as 

 long, shorter than the tenth and the eleventh which are elongate and subequal ; 

 club only moderately thick' : i)alpi rufo-testaceous, last joint somewhat infuscate 

 at apex. Thorax widest at middle where it is three fourths the width of the 

 head and about as wide as long ; not very strongly arcuate in front, rather 

 deeply sinuate posteriorly ; the apex slightly narrower than the base ; punctures 

 coarse and very close, ' separated by less than half their diameters; median 

 canaliculation distinct from base to apex, very strong in middle third where 

 the disk is somewhat swollen cither side. Elytra slightly narrower than the 

 head at base, about as wide at the widest where they are as wide as long, suture 

 a little longer than the thorax ; sides arcuate and slightly divergent, apex mod- 

 erately emarginate ; punctvires coarser than those on the thorax, polygonally 

 crowded along the suture and apically ; disk distinctly impressed on the suture 

 at base and laterally ; a small fulvous spot on the center of each just behind 

 the middle. Abdomen narrower than the elytra at base, rather rapidly de- 

 creasing in width posteriorly, basal segments coarsely and closely punctate, 

 fourth and fifth with the punctures much finer and sparser. Legs long and 

 slender; femora pale testaceous at base, gradually darker apically; first joint 

 of the posterior tarsi equal in length to the next three. Length, 4.5-5 mm. ; 

 width, I mm. ,^5. Two specimens. 



Male. Fourth ventral abdominal segment broadly and \-ery feebly emar- 

 ginate in median third, a small subcarinate tubercle at either end of the emar- 

 gination. Fifth segment broadly subtriangularly emarginate in median third, 

 emargination about four times as wide as deep ; surface posterior to the emar- 

 gination depressed for half the length of the segment bounded on either side 

 by a carinate edge which is bluntly dentiform at the posterior extremity. 

 Sixth segment with a deep subtriangular emargination as wide as deep and 

 about one fourth the width of the segment and half its length. Seventh seg- 

 ment truncate at apex with an acute tooth at either side. 

 Female. Ventral segments unmodified. 



This species is easily distinguished from the others of the group 

 by the form of the thoracic canaHculation. From S. semicolon Lee, 

 which it most closely resembles, it may be also distinguished by its 

 larger size and much longer and more slender antennae. The thoracic 

 canaliculation is like that of the palsearctic ^. himacidatus Gyll., but 



