the; mycetophiud.-t; of north America. 227 



faintly over the branches of the media and l^eyond the anterior 

 branch of the cubitus where it nearly or quite reaches the wing 

 margin ; subcosta ends in the costa weh beyond base of the 

 radial sector, the subcostal crossvein is situated half way 

 between the humeral crossvein and the base of the radial sector ; 

 R2+a arises before the apex of Ri but ends well beyond its tip ; 

 the costa is produced well beyond the tip of Ri+i but does not 

 leach the tip of the wing; the anal vein is produced to the wing 

 margin ; the apical end of the first section of the radial sector 

 and of the media hyaline white, the remainder of the veins 

 brown, the heavier veins darkest. Length of wing 6 mm. One 

 specimen from Burlington, Vt. taken in June by jNIr. C. W. 

 Johnson. 



■3. Genus Ditoinyia Winnertz. 

 Ditomyia Winnertz, Stett. Ent. Zeit, VII, 14. 3. 1846. 

 Head spherical, flattened in front; 3 ocelli, unequal, in a 

 transverse line; palpi 4 jointed; antennas 2-f-i5 jointed, the last 

 very small, papilliform. Abdomen with 7 visible segments. 

 Legs long and slender, tibic^e with short spurs. \\'ings (fig. 80) 

 large, hairy, subcostal vein short, incomplete ; R2+3 arises proxi- 

 mad of the fork of the media; media arises apparently at the 

 R — M crossvein, the basal section having been wholly obliter- 

 ated ; cubitus forks slightly proximad of the M — Cu crossvein; 

 anal vein prolonged to the margin. 



Ditomyia cuzona Loew. 

 1869. eusona Loew, Berl. Ent. Zeitschr. XIIL i. 

 Male. Length 6 mn^ Head, scape, and base of first flagellar 

 joint yellowish, flagellum and palpi blackish. Thorax yellow, 

 dorsum with dusky vittse; scutellum except the base, fuscous. 

 Abdomen yellow, each segment with a black posterior fascia 

 which is dilated in the middle and on the lateral margins, hypo- 

 pygium dusky. Coxse and legs yellowish. Wings hyaline, gray- 

 ish tinged, with the following fuscous fasciae; the first near the 

 base of the wing extends from the costa into the basal cell R, 

 the second extends across the wing from near the apex of the 

 subcostal cell to the posterior branch of the cubitus ; the third 

 widely covers the apex of the wing. Length of wing 6.2 mm. 

 Haltercs yellow. 



