150 Notes on the Species of Stenus 



Sp. 24 (5). affinis, Kirby, MSS. and Coll. 

 Wilkin's Coll. 

 Steph. Ilhistr. (not Coll.) 

 Canolicnlnlus, Ericlis. 



St. (ijfints of Stephens' Collection is St. bino- 

 tatus of Ericlis. 



Sp. 25(6). angustaiiis, Kirby, MSS. and Coll. 

 Steph. Illustr. and Coll. 

 W 11 kins, Coll. 

 buphthalmus, Erichs. 



Sp. 26 (7). melanamis, Kirby, MSS. and Coll. 



Steph. Illustr. (not the Coll.) 

 cinerascens, Erichs. ? 



Stenus melanaritis, Kirby. 



Black, sparingly clothed with whitish pubescence ; thorax and 

 elytra but little glossy ; abdomen glossy. Head thickly punc- 

 tured, about one-third broader than the thorax, the frontal sulci 

 moderately impressed, and separated by an evenly convex space ; 

 antennae with the third and fourth joints nearly equal (the third 

 rather the longer) ; palpi black, with the basal joint testaceous. 

 Thorax subcylindrical, the sides gently rounded, and the broadest 

 part rather in front of the middle ; thickly punctured, the inter- 

 spaces between the punctures very narrow, but for the most part 

 flat : a slight transverse depression near the front, and the base 

 obscurely depressed, and somewhat rugulose in the middle. Elytra 

 rather small, but little longer than the thorax ; rather thickly but 

 not strongly punctured, the interspaces flat, depressed at the 

 suture, and with an oblong depression between this part and the 

 shoulder; these parts scarcely torulose. Abdomen considerably 

 elongated, and narrow ; but little convex, and with fine, and some- 

 what widely scattered, punctures. Tarsi rather short. 



Amongst the British species this approaches most neaVly in size 

 and general appearance to the St. buphthalmus, Er., but it has 

 a narrower thorax, and the sides of this segment are not so much 

 dilated ; the elytra are less strongly punctured (not rugulose), and 

 the middle basal depression, as well as the sutural one, are more 

 marked ; the punctures on the abdomen are less strong, and less 

 numerous. The head, moreover, is rather narrower, and the frontal 

 ridge is rather less strongly marked than in St. buphthalmus. 



