THE CANADIAN ENTOMOLOGIST. 135 



abscissa slightly curved, appendix below heavy and straight. Fort 

 Collins ; September. 



Differs from fuagna in size, shape of abdomen, etc. 



Alloxysta apicalis, n. sp. 



Female. — Shining black, antennae at base and legs honey-yellow, head 

 pale rufous ; abdomen light reddish-brown, black at tip. Length, 1.4 mm. 



Antennai 13-jointed, piceous beyond joint 4 ; flagellum slightly 

 heavier toward the tip; joints t, 3 and 4 subequal, 2 a little shorter; 

 apical joint conical at the tip, longer than the anteapical. Abdomen 

 from the side subtriangular, pointed behind. Radial cell large, two and 

 a half times as long as wide, terminal abscissa slightly curved, appendix 

 below slender, strongly knobbed at the tip. Fort Collins ; September. 



Readily recognized by the peculiarly coloured abdomeu. 

 Alloxysta rufipleut-a., n. sp. 



Male. — Shining black, antennje at base and legs honey-yellow ; head, 

 prothorax, and all pleura bright rufous. Length, 1.25 mm. 



Antennas 14-jointed, dusky beyond joint 5 ; flagellum subfiliform ; 

 joints I, 3 and 4 subequal, 2 a little shorter, 3 somewhat swollen at the 

 apex beneath ; apical joint conical, little longer than anteapical. Abdo- 

 men from side subequilaterally triangular, strongly produced and pointed 

 below. Radial cell of medium size, two and one-half times as long as 

 wide, terminal abscissa of the radius strongly curved, appendix below 

 rather long and emarginate on the proximal side. Fort Collins ; June. 



Separated from all the above species by the partially rufous thorax. 

 Alloxysta abdomiiialis, n. sp. 



Female. — Dark shining piceous, abdomen and thorax lighter ; head 

 and metathorax rufous ; antennae at base and legs honey-yelloAV. Length, 

 I mm. 



Antennse 13-jointed, piceous beyond joint 4 ; flagellum slightly 

 enlarged toward the tip ; joints 3 and 4 shorter than i and but little 

 longer than 2 ; apical joint slender, conical, very long, a half longer than 

 the anteapical. Abdomen from the side subequilaterally triangular. 

 Radial cell shorter and broader than in rufipleura, the terminal abscissa 

 of radius gently curved, appendix below slender, curved, knobbed at tip. 

 Fort Collins ; June. 



Resembling rufipleura, but differing in size, and antennal and wing 

 characters. It is hardly possible that this could be the female of rufipleura. 



