48 PROCEEDIlsrGS OF THE NATIONAL MUSEUM. vol.64 



costal ratio 4:1.2:1, fourth vein 1.1:1:3.2, fifth vein 2:1; Halteres 

 whitish. Length 3.5 mm. 



Holotype. — Marlboro, Md., collected by R. C. Shannon, 19 June, 

 1916; in National Museum, Cat. No. 26277, U.S.N.M. 



78. SOBAROCEPHALA VALIDA. Williston. 



(Fig. 30.) 



ffeteroneura valida, Williston, Trans. Ent. Soc. Lond., 1896, p. 388, fig. 136 

 (1896).— CzERNY, Wien. ent. Ztg., vol. 22, p. 102 (1903).— Williston, Manual 

 N. Amer. Dipt., 3 ed, p. 319 (1908). 



Heteromeringia valida Malloch, Proc. Ent. Soc. Wash., vol. 20, p. 8 (1918). 



Head including antennae, proboscis and occiput light yellow, 

 arista black, pubescent, two and a half times length of antennae, 

 bristles yellowish. Thorax light yellow, mesonotum broadly on the 

 sides and behind and the scutellum brown or black, shining, meta- 

 notum yellow; the yellow of the front of the mesonotum extends as a 

 broad central stripe to or beyond the suture. Abdomen black or 

 dark brown, its base, the ovipositor and the small hypopygium 

 yellow. Legs yellow, double rows of short setae on underside of 

 anterior femora. Wings uniformly cinereous hyaline, narrow, the 

 sections of costa 7:1.5:1, of fourth vein 1:1:3.5, of fifth vein 1.5:1. 

 Length 2.5 mm. 



From cotype specimens from St. Vincent, from the collection of 

 Cornell University. 



79. SOBAROCEPHALA VARIEGATA, new dpecies. 



(Fig. 40.) 



Male. — Head ochraceous, paler beneath, a small brownish spot 

 under each eye; third antennal joint circular, luteous, a blackish 

 spot at base of the black and bushy-plumose apical arista; head 

 bristles reddish yellow, six fine hairs in buccal fringe, upper occipital 

 ofbits with a row of ten black stiff setae, postverticals very small, 

 no ocellars. Thorax variegated black and yellow; mesonotum with 

 three distinct pairs of black markings, including one pair of parallel 

 vittae half the length of the mesonotum and extending to base of the 

 black scutelhmi, one pair of oblique spots directly above the wings 

 and fusing anteriorly with the first pair of stripes, and a third pair 

 of narrow posthumeral fasciae, the last crossing the pleurae to the 

 middle coxae; pleurae with two additional subalar spots and the 

 hypopleurae black; presuturals undeveloped, two small lateral 

 scutellar setae, mesonotal hairs black. Abdomen centrally black, 

 first two segments yellow; hypopygium large and yellow, valves 

 long, narrow, nearly parallel-sided. Legs yellow, the middle femora 

 with brownish spot above knee, hind femora with central brownish 



