THE CANADIAN ENTOMOLOGIST. 



thick and delicately fluted. The mesonotal grooves are wanting. Meta- 

 thorax areolated. The abdominal petiole is about two and a-half times 

 as long as wide, finely rugose and with a slight constriction at about the 

 middle above. The middle and posterior tarsi are slightly dusky. Wings 

 hyaline, the venation pale, the 2nd branch of the radius longer than the 

 transverse cubital nervure. 



Described from two specimens taken by Mr. E. A. Schwarz, at Oak- 

 land, Md. 



LIPOLEXIS FORSTER. 



(16) Lipolexis fuscicortiis n. sp. 



% . — Length i? mm. Black, polished ; mandibles, palpi, two basal 

 joints of antennae base of third, legs and petiole flavo-testaceous, the 2nd 

 abdominal segment piceous. Face scaly. Antennae 12-jointed, the 

 flagellum slightly thickened toward tip, fuscous, the joints twice as long 

 as thick. Wings hyaline, the venation brown, the radius unusually long 

 and almost forming a closed radial cell. 



Taken at Ottawa. This is the only species to be described in this 

 genus with 12-jointed antennae, and this character, with the long radial 

 vein, will readily distinguish it from the several other species now placed 

 here. 



HISTEROMERUS WESMAEL. 



(17) Histeromerus Canadensis t^.'^'^. 



?. — Length 2% mm.; ovip. g mm. Black, polished ; collar and 

 prosternum flavo-testaceous ; legs yellowish-red. The oblong head is a 

 little longer than wide, a little wider behind than in front, smooth and 

 polished, except some punctures above the clypeus. Antennae 15-jointed, 

 and when extended backward extend only to the tegulse. The dorsum of 

 thorax is flattened, the parapsidal grooves indicated only anteriorly by 

 some punctures. The abdomen is as long as the head and thorax 

 together, compressed, black, the sutures of the ventral segments tinged 

 with yellow. Wings subhyaline, somewhat narrowed, the veins brown ; 

 the 2nd submarginal cell is long and rather narrow, about one-third longer 

 than the 3rd ; the recurrent nervure enters the 2nd submarginal cell at its 

 lower posterior angle. 



Described from a single specimen. Its smaller size, colour and the 

 paucity of joints in the antennae, will at once separate it from H. mysta- 

 cinus Wesmael. 



