278 MAINE AGRICULTURAL LXPERIMICNT STATION. I9II. 



yellow ; claws unmodified, each toothed near the base. Wings 

 3.75 times as long as the fore tibia; hyaline, veins yellowish 

 brown; venation as figured (Fig. 192). Halteres yellow. Two- 

 gwatee-e Pass, VVyo., Sept. (W.M.W.). In one specimen from 

 Black Rock Creek, Wyo., the subcosta ends opposite the base 

 of Rs. 



II. Genus Leia Meigen. 

 System. Beschr. I. 258. 1818. 

 Lejomya Rondani, Prodr. i, 195. 1856. 



Glaphyroptcra Winn. Verb. Zool.-bot. Ges. XIII. 781. 1863. 

 Neoglaphyroptera. O. S. Catl. Dipt. N. A. 10. 1878. 



Eyes oval, ocelli 3, the laterals large, rather close though not 

 contiguous to the eye margin, the middle one rarely absent. 

 Legs moderately strong, setae of fore legs rather delicate ; those 

 on the extensor surface of middle and hind legs stout. Wings 

 elongate oval ; subcosta ends in the costa at one-fourth or one- 

 third the wing length from the base and is connected with Ri 

 by Sc2 near its apex; the basal cell R is very long, extending 

 beyond the middle of the wing; the media usually forks notice- 

 ably before the base of the radial sector; the cubitus forks 

 proximad of the proximal end of the R-M crossvein, its ante- 

 rior branch is sometimes slightly disconnected at the base ; 

 anal vein stout, incomplete. The larvse live in mushrooms. 



Table of species. 



a. Thorax largely black, not vittate, humeri and anterior margin may 



be yellow, wing fasciate. 



b. Fore part of thorax yellow, head black between the eyes, wings 



with preapical fascia and a dash behind Cu2 but no discal 



mark. i. varia. 



bb. Thorax not yellow anteriorly except sometimes the humeri. 



c. Scutellum, vertex, and occiput yellow ; Mexican. 2. punctata. 

 cc. Scutellum black. 



d. Halteres wholly yellow. 



e. Costa produced about i-io of distance from Rs to Mi. 



3. melaena. 

 ee. Costa not produced. 



f. Preapical wing band lies beyond the middle of cell Rs 



and nearly fills apex of the wing. 4. nigra n. sp. 



ff. Preapical wing band nearly reaches the base of cell Mi, 



4a. nigra var. ; 



