592 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 56. 



tarsal joints thickened, not elongate. Male claws short. Thoracic 

 chaetotaxy very similar, but all the bristles much reduced in size. 



BEZZIMYIA BUSCKH, new species. 



Length, .5 mm. One male, Trinidad Rio, Panama, February 17, 

 1912 (A.Busck). 



Dusky brownish, faintly pollinose. Palpi small, short, fulvous. 

 Third antennal joint and arista clear orange, the basal joints obscurely 

 so. Frontalia brown. Rest of head very faintly silvery, as is the 

 thorax; latter shows indistinctly tv/o heavy brown vittae. Scutellum 

 and abdomen brown, without distinct pollen. Legs brown, femora 

 more or less rufous. Wings slightly fuscous, with a clear streak near 

 costa on basal two-thirds. Tegulae small, glassy-whitish or faintly 

 tinged. 



Type.—Csit. No. 22263, U.S.N.M. 



Tribe CUTEREBHINI. 

 ATRYPODERMA, new genus. 



Genotype. — Musca americana Fabricius; equals Trypoderma ameri- 

 cana Wiedemann. 



Differs from Cuterehra (type, cuniculi Clark) as follows : Mesoscutum 

 at most scarcely as long as wide. Abdomen no wider than thorax. 

 Front not prominently produced, the front border of head viewed 

 from above subarcuate. Antennal axis little over half head height. 

 Whole outline of head and body viewed from above equilateral and 

 subquadrangular. 



Cuterehra has the mesoscutum fully as long as wide; the abdomen 

 very conspicuously wider than thorax; the front strongly produced, 

 the head viewed from above being sub triangular ; the antennal axis 

 nearly two-thirds head height; the outline of head and body viewed 

 from above strongly contrasted with that of Atrypoderma and quite 

 Bomhus-Wke,. Cuterehra maculosa Knab, described from Panama, 

 belongs in Cuterehra, 



