NO. 2281. A REVISION OF C HALOID -FLIES— PHILLIPS AND EMERY. 447 



Antennae: First joint of funicle plus ring-joint usually nearly 

 twice as long as pedicel ; all of funicle and club joints distinctly longer 

 than broad; club joints same width as funicle. Scape black. 



Species medium in size. 



Male (pi. 48, fig. 4). — Length 2.0 mm. Pracscutum as in female. 

 Pronotal spots large, bright, occupying one-third to one-half ante- 

 rior dorsal margin of prothorax. 



Propodeum with a complete groove; rugose within and laterad of 

 groove. 



Petiole about twice as long as broad, is three-fourths length of 

 hind coxae. 



Legs black except distal one-third of front femora and knees 

 which are testaceous. 



Antennae : Flagellum with pedicel equal to head and thorax com- 

 bined; hairs on the first joint of flagellum distinctly longer than the 

 last joint of antennae; last joint bears a short tubercle which is about 

 twice as long as broad. Scape exclusive of base, one-third as broad 

 as long as seen in lateral profile; is broader in basal half than in 

 distal; no distinct shoulder in distal extremity; distinctly broader 

 than first joint of flagellum. There may be from one to three annula- 

 tions or indications of such at each articulation of the flagellum. 



Type-locality. — Front Royal, Virginia. 



Type.— Cat. ^o. 21756, U.S.N.M. 



Described from many females and males reared in cages under 

 irtificial conditions and from specimens reared from orchard grass 

 {Dactylis glomerata) collected in Indiana, Ohio, New York, Mich- 

 igan, Pennsylvania, and Virginia. 



This species inhabits the center of the stem and breeds only in 

 orchard grass. Males normally occur. 



HARMOLITA ELYMI French. 



Plate 39, fiJ,^ 3 ; plate 43, fij,'. 8 ; plate 45, fig. 21. 



iHosovia eiyini French. Can. Ent., vol. 14. p. 9, 1882. 



Isosoma elymi (French) Howard, U. S. Dept. Agr., Div. Ent., Bull. tech. 

 ser. No. 2, p. 14, 1896. 



Female. — Praescutum reticulately lineolate and occasionally with a 

 few small shallow impressions. Pronotal spots large, occupying one- 

 half to two-thirds anterior dorsal margin of prothorax. 



Proi^odeum with a distinct, narrow, continuous, median, longitudi- 

 nal, margined groove, which contains numerous cross rugae; mar- 

 ginal carinae usually parallel and regular; the spiracular carinno 

 prominent. There is a shield-shaped granulose area (rarely rugose) 

 laterad of groove; fimbria not prominent. 



Abdomen equal to or shorter than head and thorax combined ; seg- 

 ment 2 almost equal to 3, 4, and 5 combined, occupying nearly one- 

 third of the entire dorsal surface ; 3, 4, and 6 subequal. 



