HENRY J. FRANKLIN. 139 



considerably shorter than its width at apex, slightly less than one- 

 sixth as long as the eye. Clypeus shining and rather sparsely and 

 delicately punctate. Ocelli not far below supra-orbital line, slightly 

 above narrowest part of vertex ; lateral ones somewhat nearer to mar- 

 gins of eyes than to each other. Flagellum of antennas about one 

 and two-thirds times as long as scape ; third antennal segment equal 

 to fourth and fifth taken together, the fifth scarcely longer than the 

 fourth. 



Thorax — Dorsum yellow, but with a very broad and well defined 

 black interalar band (this band being distinctly, but not greatly, more 

 than half as wide, from front to rear, as it is long, from wing base to 

 wing base, and of nearly equal width all the way across, though 

 slightly narrower toward the bases of the wings) ; middle of disc with 

 a longitudinally elongate area, large enough to be very noticeable to the 

 naked eye (this area being within the black interalar band), naked, 

 mostly smooth and shining. Mesopleura often covered with yellow 

 pile very nearly to the bases of the legs and always with the yellow 

 extending down as far as two-thirds of the distance from the level of 

 the bases of the wings toward the bases of the legs. Metapleura 

 sometimes clothed for most part with yellow pile and sometimes with 

 only their very upper ends bearing yellow hair. Sides of median seg- 

 ment sometimes entirely dark, but often with considerable yellow 

 hair. 



Abdomen. — Dorsum : segment one yellow ; segment two yellow on 

 basal middle, but with ferruginous pile on the extreme sides and along 

 the hind margin, the yellow patch narrowing toward the front margin 

 on the sides of the segment ; segment three ferruginous ; segment four 

 with some ferruginous pile and a few black hairs on the very middle, 

 at least at the base, but for the most part clothed with yellow pile ; 

 segment five black, but with a few yellow hairs on the extreme sides ; 

 segment six dark. Venter usually entirely dark. Epipygium with a 

 low, rounded, longitudinal median carina on its very apical portion. 

 Hypopygium also tending to be carinate in the middle on its very 

 apical portion. 



Wings. — Only very moderately infuscate ; the fore pair generally 

 lightest across their middle portion. 



Legs. — Pile, including the corbicular fringes, all dark. 



Dimensions . — Length, 14 mm. to 15j mm. ; spread of wings, 34 mm. 

 to 36 mm. ; width of abdomen at second segment, 7 mm. to 81 mm. 



This species has its closest relative in nifocinchis, of which 

 it may indeed be only a subspecies. I have been unable to 

 separate it structurally from nifocinctus, but it may readily 

 be separated from that species, as it is known to me, by its 

 darker occiput and its much wider and better defined black 



TRANS. AM. ENT. SOC. , XXXIX. 



