ART. H. FLIES OF THE FAMILY CLUSIIDAE MELANDER AND ARGO. 9 



its veins brown, costal sections 6 :1.3 :1, third vein ending at wing- 

 tip, sections of fourth vein 2 :1 :4. Legs entirely yellowish, front 

 and middle femora with close-fitting double flexor combs of short 

 setae, middle tibiae with preapical bristle. Length 3 mm. 



Holotype. — Alhajuelo, Panama, 12 March, 1912, August Busck, 

 Cat. No. 26260, U.S.N.M. 



10. CHAETOCLUSIA QUADRIVITTATA, new species. 



(Fig. 15.) 



Female. — Front yellow, ocellar spot black, face and cheeks pale 

 yellow; antennae and mouthparts 3^ellow, the former dorsally piceous, 

 arista slender, three and a half times the antennal length and deli 

 cately pubescent; head bristles long and brownish. Mesonotum 

 testaceous with two blackish stripes on either side, extending from 

 the neck, where they are joined, to the tip of the scutellura, where 

 they are joined again; pleurae pale yellow except metapleurae which 

 are brownish. Abdomen blackish except first and basal sides of 

 fifth segments. Legs entirely yellow, apical spur of middle tibiae 

 strong and black, no femoral comb of setae. Wings cloud}^ except 

 on basal third, bristles of first vein distinct, costal ratio about 5 :1 :1, 

 segments of fourth vein 1.5 :1 :3.5, of fifth vein 2.3 :1. Length 

 3.5 mm. 



Types. — Three females. La Suiza de Turrialba, Costa Rica, April - 

 July (Pablo Schild). Type and one paratype in Melander collection, 

 paratype in National Museum, Cat. No. 26261, U.S.N.M. 



11. CHAETOCLUSIA NIGROMACULATA, new species. 



Female. — Testaceous, the abdomen black except apex, a black 

 spot between root' of wing and scutellum, a large round black spot 

 filling upper portion of sternopleura, metapleurae black anteriorly; 

 antennae and mouthparts j^ellow, arista delicately plumose; bristles 

 dark brown. Legs yellow, front and hind tibiae and tarsi brownish. 

 Knobs of hal teres whitish; wings brownish, paler at basal half, costal 

 sections 5:1:1, sections of fourth vein 3:2:8, of fifth vein 1.4:1. 

 Length 3.5 mm. 



Holotype. — Hayti, in Melander collection. 



12. CHAETOCLUSIA XANTHOPS Williston. 



(Fig. 14.) 



Heteroneura xanthops Williston, in part, Trans. Ent. Soc. Lond., (189G), p. 386. — 

 CzERNY, Wien. ent. Ztg., vol. 22, p. 100 (1903). 



Head including antennae and mouthparts wholly yellow, arista 

 loosely plumose, brown. Mesonotum black lateral to dorsocentral 

 rows, centrally luteous, scutellum and metathorax yellow, pleurae 



