44 PROCEEDINGS OF THE NATIONAL MUSEUIVI. vol. 64 



ocellar bristles reaching half-way to antennae and equal to postvert- 

 icals; front narrower than eye. Mesonotmn brownish, on each side 

 in front with an inverted H -shaped yellow spot, scutellum black, 

 metanotum brown, pleurae pale yellow, metapleura blackish; notal 

 hairs and bristle black, prescutellars absent, one lateral scutellar seta 

 located well up on disk, sternal hairs short and yellovv^ Abdomen 

 blackish except at extreme base, hypopygium small, valves nearly 

 square. Legs yellowish, posterior knees capped with brownish, front 

 tibiae and front tarsi black, hind tibiae bro\\Tiish before apex, hairs 

 dark, though pale at base of femora, nine black setae in posterior 

 flexor row of front femora, middle femora with four setae in front 

 row near knee and eighteen setae in posterior row arranged the full 

 length of the femur. Wings with apical three-fourths cloudy, 

 gradually merging into the subhyaline base, costal ratio 4.5 : 1.5 : 1, 

 fourth vein 0.9 : 1 : 2.5, fifth vein 2.25 : 1, second vein distinctly 

 diverging from third at tip, but ending much nearer to tip of wing 

 than to posterior crossvein; halteres white. Length 3 mm. 



Female. — Abdomen with last segment and ovipositor whitish; hind 

 tibiae black. 



Types. — Ten specimens, Turrialba, Costa Rica, secured from Pablo 

 Schild, Melander collection. Paratype deposited in National Museum, 

 Cat. No. 26274, U.S.N.M. Remarkably constant in structure and 

 color. 



70. SOBAROCEaPHALA LUMBALIS Williston. 



(Fig. 37.) 



Heteroneura lumbalis Williston, Trans. Ent. Soc. Lond., 1896, 388 (1896).— 

 CzERNY, Wien. ent. Ztg., vol. 22, p. 103 (1903).— Williston, Manual N. Am. 

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



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



Head, thorax, antennae, palpi, hypopygium, ovipositor, legs and 

 halteres yellow, the posterior part of mesonotmn and the scutellum 

 brown, abdomen blackish, extreme base yellowish in female. Arista 

 plmnose, buccal hairs small, bristles strong and brown, no pre- 

 scutellars, a single minute lateral scutellar hair. Hypopygial 

 lamellae rounded elongate triangular. Preapical bristles of middle 

 tibiae strong. Wings and veins yellov/ish, not clouded, sections of 

 costa 4 : 1.1 : 1, of fourth vein 1.1 : 1 : 3.5, third vein ending almost 

 at wing- tip. Length 2.5-3 mm. 



Distribution. — Described from co type specimens from collection of 

 Cornell University. Original locality, St. Vincent, West Indies. 

 Recorded by Malloch from Grenada. The National Museum con- 

 tains the species from Alhajuelo and Paraiso, Panama, collected by 

 August Busck. 



