250 MAINE AGRICULTURAL, EXPERIMENT STATION. I909. 



jj. Fore metatarsus over a third longer than 

 the tibia; hypopygium (fig. 107). 

 19. snbtcruiinalis var. nexilis n. var. 

 ii. Fore metatarsus equal to or shorter than 

 the tibia, 

 j. Mesonotum mainly yellow; stripes if 

 present, pale, coalesced part of media 

 shorter than the jietiole. 

 k. Anal vein prolonged to margin ; 

 hypopygium with lobe-like for- 

 ceps (fig. 99). 17. mcndosa. 

 kk. Anal vein not prolonged to margin ; 

 fore metatarsus and tibia sub- 

 equal ; hypopygium robust (fig. 

 100). 22. genualis n. sp. ^ 

 jj. Mesonotum black or with dark stripes, 



coalesced part of media usually equal 1 



to or greater than the petiole. ^ 



k. Fore metatarsus about 1-5 of tibial 

 length shorter than the tibia ; sub- 

 costa ends about twice the width of 

 the costal cell proximad of the base /^i 

 of the radial sector ; length 5-6 mm. 

 23. scapiilaris n. sp. 

 kk. Fore metatarsus o.i or less shorter 

 than tibia ; subcostal vein ends not 

 more than the width of the costal \/ 

 cell proximad of the base of the 

 radial sector; length 8-9 mm. 



I. Scape of antennae and base of some 



abdominal segments yellowish. 



24. clcgantula. 



II. Scape of antennae black ; abdomen 



of male mainly black. 



25. tcEniata. 



I. Platyiira parva Williston. ^ aM^^-^ ^^ ^/. 



1896. parva Williston, Trans. Ent. Soc. London 257. 

 Male. Length 2^ to 3 mm. Antennae brownish-yellow, 

 shorter than the thorax. Posterior part of the mesonotum, the 



