290 THE CANADIA.N ENTOMOLOGIST. 



Neotomostet/ms, n. gen. — Malar space broad and distinct, the eyes 

 being distant from the base of the mandibles ; antennae wiih the third 

 segment longer than the fourth ; mesothoracic epimera with a transverse 

 suture below the episternum, separating off a prsesternum ; claws with a 

 small tooth within before the apex. Type Neotomostethus hyalinuSs 

 MacG. 



Neotouiostethus hyalintis, n. sp. — Body black, with the tegulae and 

 the legs below the knees, except the apices of the posterior tibi?e and 

 tarsi, white ; antennal fovea broad and rounded ; antennal furrow wanting 

 on the front ; wings hyaline. Length, 6 mm. 



Habitat : McLean, N. Y. 



RhadiiiocercEa shni/ata, n. sp. — Body black ; the wings strongly 

 infuscated ; the postocular area elongated ; the ocellar basin distinct ; 

 the saw-guides rounded at apex to a blunt point above. Length, 8 mm. 



Habitat : Ithaca, N. Y., and Agricultural College, Mich. 



Hypargyricus^ n. gen. — Malar space broad and distinct, the eyes 

 being distant from the base of the mandibles ; antennae with the third 

 segment subequal in length to the fourth ; mesothoracic epimera not with 

 a transverse suture below the episternum ; claws cleft at apex, the inner 

 tooth nearly as long as the outer. Type Hypargyricus infuscatus, MacG. 



Hypargyriais infiiscatiis^ n. sp. — Postocular area strongly elevated ; 

 saAv-guides straight on the upper and lower margins, and rounded to a 

 blunt point at middle of apex; body black; the front femora and tibiae 

 more or less white in front, suffused with black; wings infuscated. 

 Length, 8 mm. 



Habitat : Ithaca, N. Y. ' 



Selaiidria ( Phyuiatocera) fii77iipennii>^ Nort. — This species belongs 

 to the genus Hypargyriais. The genus Phymatocera, so far as I am 

 aware, does not occur in America. 



Isiodyctititn atratum, n. sp. — Body black, with the clypeus, the 

 labrum, a spot on the mandibles, the collar narrowly, the tegul?e, a 

 narrow line on the posterior margin of the abdominal segments, broadest 

 on the venter, and the legs, brownish-white ; a band on the posterior 

 margin of each lobe of the mesonotum, the scutellum, and the median 

 tergal abdominal segments more or less rufous ; saw-guides concave above 

 and convex below, broadly rounded at apex to a point above ; wings 

 hyaline. Length, 6 mm. 



Habitat : Ames, Iowa (E. D, Ball). 



