246 MAINE AGRICULTURAL EXPERIMENT STATION. I9O9. 



6. Genus Platyiira Meigen. 

 Platyura Meigen, Illiger's Mag. II. 264. 1803; Klass I. loi. 1804. 

 ZcJinira Meigen, Noiiv. Class. Mouches. i6. 1800. (without 



type). 

 Head small, ocelli closely approximated, median smallest; 

 palpi 4 jointed; antennse 2-|-i4 jointed, cylindrical or somewhat 

 compressed, closely sessile. Thorax oval, setose; abdomen with 

 7 visible segments, depressed apically. Legs long, femora 

 somewhat thickened; tibiae spurred, setze very minute. Wings 

 (figs. 84, 85, 86) somewhat broadened, as long or longer than 

 abdomen ; costa prolonged beyond the tip of R4+5 and ending 

 before the tip of the wing; subcosta ends in the costa, rarely 

 ending free, subcostal crossvein usually present, R.+s very short 

 usually ending in the costa, rarely in Ri; prefurca of media' 

 short ; anal vein either incomplete or produced to the margin. 



Table of species. 

 a. Rs-fs ends in Ri; subcostal crossvein wanting (fig. 85); 

 tibiee each with but one spur. Length 2 mm. West 

 Indies. i. parva. 



aa. R2+3 ends in the costa, beyond the apex of Ri. 



b. Subcostal vein ends noticeably beyond the base of the 

 radial sector. 

 c. A distinct transverse fascia or band at or near the apex 

 of wing, or wings with several spots, 

 d. Wing with band; thorax brown, a median stripe on 

 posterior half and sides yellowish, abdomen dusky, 

 bases of -segments yellowish, halteres with black 

 knob. Length 10 mm. Washington. 2. fasciola. 

 dd. Wing spotted ; length 3 mm. 7. clegans. 



cc. Apex of wing hyaline or only indistinctly smoky, no 

 band, 

 d. Apices of abdominal segments black ; fore metatarsus 

 longer than its tibia; length 4^ mm. 3. iyiops. 



dd. Apices of abdominal segments, yellow. 



e. Thoracic vittcC black; fore metatarsus shorter than 



tibia. 4. sctigcr n. sp. 



ee. Thoracic vittae reddish yellow. Washington State. 



5. lurida. 



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