ART. 15 NEW GENEEA AND SPECIES OF MUSCOID FLIES ALDRICH 3 



Length, 4.2 mm'. 



Described from seven males collected in Santo Domingo, West 

 Indies, July 5-8, by August Busck. 

 Ty^e.— Male, Cat. No. 41813, U.S.N.M. 



Family TACHINIDAE 



Genus PHOROCERA Robineau-Desvoidy 



Phoroccra Robineau-Desvoidy, Myodaires, 1830, p. 131 ; Dipt. Environs de 

 Paris, 1868, vol. 1, p. 509. — Aldbich and Webber, Proc. U. S. Nat. Mus., 

 vol. 63, art. 17, 1924, p. 43. 



The genotype is Tachina assimilis Fallen. Aldrich and Webber 

 have discussed the synonymy in detail. 



PHOROCERA RUSTI, new species 



Male. — A rather large gray species with heavily striped thorax; 

 the head (except vertex and occiput), and the fourth abdominal 

 segment with deep golden pollen. Front rather wide, at vertex 0.25 

 of head width. The vertex with gray pollen, which extends as far 

 as the second of the large recurved frontals, where it changes into 

 the dense golden pollen which continues down around the eye and 

 narrowly on the posterior orbit; below the reclinate frontals the 

 much smaller decussate ones are rather scattered \)ut become normally 

 large at the antennae, the lowest ones fully meeting the row of large 

 bristles on tlie facial ridges. The parafrontal at the second reclinate 

 bristle is slightly wider than the seal-brown middle stripe and much 

 wider near the antennae. Cheek about one-third the eye height, 

 sloping upward anteriorly. Vibrissae at oral margin but considerably 

 above lower edge of head. Antennae black, rather slender, third 

 joint three times the second; arista slender, thickened only on basal 

 fourth. Palpi black. Thorax gray with four very distinct black 

 stripes, the two median extending some distance behind the suture, 

 the outer almost to the scutellum. Acrostichal 3, 3; dorsocentral 

 3, 3; presutural 2; sternopleural 2, 1; scutellum with three pairs of 

 laterals, apical pair decussate and depressed, more than one-half 

 as long as the longest lateral, a large pair of discals ; ground color of 

 scutellum distinctly yellowish. Calypters waxy-white, with white 

 rim. Abdomen with thin pollen, somewhat tessellated, so that irreg- 

 ular patches appear to be shining; fourth segment with very strik- 

 ing dense yellow pollen and yellow ground color; first segment with 

 a very small pair of median marginal bristles; second with a large 

 pair; third with a marginal row slightly interrupted next to the mid- 

 dle pair; fourth segment with an irregular row of discals and a few 

 small apical. Genital segments yellow, very small, the forceps 

 brown, the inner ones close together and rather strongly curved 



