351 



are arranged regularly over the entire surface ; from in front of wing- 

 base to scutellum. on lateral margins, there is a series of distinct black 

 setulos hairs ; scutellum with six strong marginal hairs. Abdomen 

 slender, rather densely covered with short black hairs; hypopygium 

 small. Legs slender ; fore femora with 4-6, mid and hind femora with 

 1-2, spines each; femora and tibije with the surface setulose ; fifth 

 tarsal joint unspined ; claws small, equal, simple. Third vein slightly 

 more than to two thirds the wing-length; first, slightlv short of middle 

 of third ; cubitus forking slightly beyond cross vein. 



Female. — Differs from the male in having the antennae short- 

 haired, their entire length equal to about one and a half times that of 

 head and thorax combined ; the larval claws larger, and each with an 

 inner median tooth, and the third vein to almost three fourths the wing- 

 length. 



Length, 3 mm. 



Illinois localities : L^rbana, St. Joseph, Mahomet, Muncie, Monti- 

 cello, Havana, Normal, Dubois, and Grand Tower. Dates of occur- 

 rence range from April to August. It is the commonest species of the 

 genus. 



The writer succeeded in rearing a female from a larva obtained 

 from Salt Fork at St. Joseph, April 5, 19 14. 



Originally described from the District of Columbia by Loew, and 

 subsequently recorded from New Jersey and New York. Professor 

 Johannsen reared the species, and figures details of the larva and 

 pupa.* 



I have seen a male and female of this species taken bv Professor 

 Aldrich at Moscow, Idaho, the former on parsnip flowers, July 2, 

 1912. and the latter August 23, 1912. 



PsEUDOBEzziA, n. gen. 



This genus is distinguished from Be::zia by the petiolate media. In 

 other respects the two genera agree. 



Type of genus, Ceratopogon expolitus Coquillett. 



PsEUDOBEzziA EXPOEiTA Coquillctt 



Ceratopogon expolitus Coquillett, Proc. U. S. Nat. Miis., Vol. 23, 1903, p. fiOO. 

 Bezzia expolita (Coquillett) Malloch, Jour. N. Y. Ent. Soc, Vol. 22, 19U, p. 282. 



This Species is described by Coquillett as having the fore femora 

 with two spines on the apical half of the ventral surface, the basal joint 



*Bull. 86, N. Y. state Mus., 190.5, PI. 18, Figs. 4-6, 9-12. 



