306 rROCEEDINGS OF THE NATIONAL MUSEUM. vol.51. 



portion of third joint. Third antennal joint rather stout, of equal 

 width, about five times as long as the very short second. Palpi mod- 

 erately stout. Facialia sparsely ciliate to above lowest frontals. 

 Eyes thickly hairy, more elongate dorsoventrally. Cheeks less than 

 one-half of eye-height. Three stemopleurals, four postsuturals. 

 Apical decussate scutellar pair erect. Median marginal pair on first 

 abdominal segment; other segments with erect discals. Apical cell 

 short-petiolate, ending far before wing tip; hind cross vein straight, 

 nearly parallel with apical cross vein. Cubitus without stump, 

 farther removed from hind margin; apical cross vein not so strongly 

 bent in. 



MADREMYIA PARVA, new species. 



Length of body, 4.5 to 5.5 mm.; of wing, 3.5 to 4.5 mm. Two 

 males. Head of Rio Piedras Verdes, Sierra Madre of Chihuahua, 

 Mexico, about 7,300 feet, August 29, 1899 (Townsend) ; and Rio Tular- 

 osa, Sierra Blanca of New Mexico, about 6,400 feet, October 3, 1896 

 (Townsend) . 



Palpi, antennae, and paraf rentals black; last showing thinly sil- 

 very from behind; face and orbits more thickly silvery. Frontalia 

 obscure rufous. Thorax and scutellum black, thinly silvery; four 

 narrow vittae; scutellum more or less distinctly testaceous on mar- 

 gin. Abdomen brownish to black; the bases of last three segments 

 distinctly silvery, the pollen spreading posteriorly in oblique lights. 

 Legs blackish; tibiae tinged with brown. Wings clear. Tegulae 

 watery-whitish. 



Holotype. — No. 20032, U.S.N.M. (Sierra Madre of Chihuahua) . 



Genus CNEPHALOGONIA Townsend. 



Cnephalogonia Townsend, Ent. News, vol. 27, 1916, p. 178. 



Genotype.— Gonia distincta H. E. Smith, 1915, Psyche, vol. 22, 

 pp. 99-100. 



Difi'ers from Salmacia as follows : Female. Front not swollen, no 

 more produced in profile than that of Cneplmlia. No median marginal 

 macrochaetae on first abdominal segment; no closely set marginal 

 row on third segment. Parafacials below not over one-half greatest 

 eye-width, widenmg above to nearly eye-width at base of antennae. 

 Front marginal macrochaetae of parafacials sparse, few, and weak. 

 Cheeks hardly one-third eye-height. Ground color of face, front, 

 and cheeks yellow. Anterior part of front wider than lower part of 

 face. Vertex narrowed to about one-half head-width. Abdomen 

 like that of Cnephalodopsis and allied genera. 



