266 MAINE AGRICUIvTURAI, EXPERIMI^NT STATION. I909. 



broad, usually longer than abdomen ; subcosta ends in the costa ; 

 subcostal crossvein present, basal in position; costa produced 

 beyond the tip of Ri+^j R2+3 oblique, and often sinuous, ending 

 in the costa; the basal section of the media usually present, 

 though delicate and fold-like, dividing the basal cell, coalescing 

 with the radial sector before the crossvein, differing in this 

 respect from Apcinon and Hesperodcs where the coalescence 

 takes place distad of the crossvein ; anal vein more or less sinu- 

 ous, and reaching the wing margin; hypopygium (figs. 93, 94) 

 consists of simple forceps resembling those of Apemon. 



Table of species. 



a. Apex of wing hyaline. 



b. A distinct spot covering petiole of the media. 



c. Length 4 to 5 mm; thoracic stripes and bases of 

 abdominal segments brown, 

 d. With a preapical and a central spot on wing. 



I. diliita. 



dd. No preapical spot. 2. Specimen from Wyo. 



cc. Length 3 mm ; abdominal fascia subobsolete ; apex 



of Ri thickened. 3. inconcinna. 



bb. No spot covering petiole of media, or at least very 



indistinct. 



c. Apex of Ri much thickened, the costa thickened 



from apex of Ri to that of R^+s; tip of R=+3 



four times as remote from tip of RH-- as from 



Ri. 4. A defective specimen from Pine L. Wis. 



cc. Apex of Ri not distinctly thickened. 



5. iininaculata. y y/ 

 aa. Apex of wing dusky. 



b. With a preapical as well as an apical band on the wing, 

 c. Abdomen luteous, apex blackish. 



d. Wing with four irregular fasci?e; the first 

 extending from apex of the subcosta to the 

 anal angle. 6. nchiilosa. v 



dd. No fascia extending back from apex of sub- 

 costa; Ri not thickened. 7. Jiirsuta. v' 



V,: 



