ART. 21 ACALYPTEATE FLIES MALLOCH 31 



mouth mar<:m, the latter rounded. Thorax with normal bristling, 

 intradorso-central setulae in about 8 series; both sternopleurals dis- 

 tinct; legs normal. 



Length, 2 mm. 



Tijpe. — Higuito, San Mateo, Costa Rica (P. Schild). Cat. No. 

 2846G, U.S.N.M. 



This species resembles some of those in Chymomyza^ but despite 

 tlie position of the lower reclinate bristle is a true Drosophila. 



DROSOPHILA BICOLORIPES, new species 



Male. — Similar to 7iigrlcosta\, differing in having the costal cloud 

 fainter, and absent in marginal cell except narrowly along costal 

 vein and at base and apex; the outer cross vein has a conspicuous 

 dark brown cloud over it, and the tip of wing is faintly clouded. 

 The fore femora except base, all of fore tibiae and the fore metatarsi 

 are black, the apical four segments of fore tarsi whitish. 



Head bristles mostly rubbed off but the scars indicate that they 

 are similar to those of last species. Inner cross vein at about two- 

 fifths from base of discal cell, second and third costal divisions 

 subequal, outer cross vein nearer to apex of fifth vein than in 

 nigi^lcosta. 



Length, 2 mm. 



r?/;?^.— Higuito, San Mateo, Costa Rica (P. Schild). Cat. No. 

 284G7, U.S.KM. 



AMIOTA STEGANOPTERA, new species 



Female. — Shining black, lower half of face, a spot on each humeral 

 angle, and one on each pleura below wing base, milk white; basal 

 visible abdominal tergite in center, and second narrowly at base, 

 yellow. Bases of antennae, and the palpi yellowish. Legs and 

 halteres testaceous yellow. Wings hyaline. 



Orbital bristles on moderate length; postvertical bristles micro- 

 scopic. Thorax normal, scutellum convex, rounded in outline, the 

 margin thick, bristles equal in length. Wing venation as in figure 

 18: third costal division with some widely separated short wart- 

 like spines on under surface as in Stegana and Leucophenga. 



Length, 2.5 mm. 



7'?//)<?.— Higuito, San Mateo, Costa Rica (P. Schild). Cat. No. 

 28468, U.S.N.M. 



No other species of the genus which I have seen has the warlike 

 spines on costa, the character being previously recorded only in 

 Stegana and Leucophenga., and the color of the abdomen is distinct 

 from that of any other described species. The species might be 

 separated from Amiota, at least subgenerically, but there is nothing 

 to be gained by such a course as the other characters are identical 

 with those of typical species of that genus. 



