ART. 11. FLIES OF THE FAMILY CLUSIIDAE MELANDER AND ARGO, 45 



71. SOBAROCEPHALA NIGRONOTUM, new species. 



(Fi£^. 28.) 



Male.. — Front blackish brown, mouthparts, cheeks, and face 

 ■whitish, the latter centrally grayish with the facial ridges brownish; 

 antennae reddish yellow, arista black and finely short-pliunose ; head 

 bristles reddish yellow. Notum entirely black, pleurae pale yellow, 

 metapleura brownish; prescutellars scarcely larger than the black 

 notal hairs, two small lateral scutellar setae. Abdomen blackish, 

 hypopygimn yellow, valves oblong twice as long as wide and crossing 

 each other. Legs uniformly pale yellow, only the hind femora with 

 slight duskiness before knee, no flexor femoral bristles. Wings uni- 

 formly and strongly infumated, veins blackish, costal ratio 4: 1.3; 1, 

 fourth vein 1:1: 2.7, fifth vein 1.5: 1 ; halteres pale yellow. Length 

 3 mm. 



Female. — Front reddish with a black central stripe, face yellow- 

 ish marked with a W-shaped brown design, clypeus brownish, facial 

 orbits and cheeks whitish, six long delicate buccal setae, mouthparts 

 yellow. Last abdominal segment and ovipositor pale yellow. Front 

 tarsi and all of the tibiae dark, the five setae on the postero-upper 

 edge of front femora dark and stronger than in male. Length 3.75 

 mm. 



Types. — Two males and two females. La Suiza de Turrialba, 

 Costa Rica (Pablo Schild), Melander collection. One of the para- 

 types deposited in National Museum, Cat. No. 26275, U.S.N.M. 



72. SOBAROCEPHALA PICTIPENNIS Kertesz. 



Monorrhexa pictipennis ICertesz, Ann. Mus. Hung., vol. 1, p. 573 (1903). 



Reddish yellow, a little shining. Upper part of head yellowish 

 gray, lower part concolorous but somewhat lighter, ocellar spot black- 

 Mesonotum with a broad black clear-cut vitta tapering in front and 

 anteriorly sending a blackish brown bowed band to each side margin ; 

 base of scutellum with a brown line which continues toward the apex 

 in a curved angle. Abdomen reddish but marked with a broad black 

 vitta which ends on the fifth segment. Tibiae and tarsi infuscated. 

 Wings with yellowish tinge, apical third more or less brown, a paler 

 brown mark over the posterior crossvein which in front forms a semi- 

 circular spot in the first posterior cell; hind margin clear brown; 

 halteres yellow. Length 5.5 mm. 



Habitat. — Surinam, South America. 



73. SOBAROCEPHALA PLEURALIS Williston. 



Heteroneura pleuralis Williston, Trans. Ent. Soc. Lond., 1896, p. 387 (1896).— 

 CzERNY, Wien. ent. Ztg., vol. 22, p. 102 flOOS). 



Head, pleurae and legs light yellow, notum and a prealar pleural 

 spot dark brown, abdomen black except immediate base. Wings 



