602 PROCEEDINGS OF THE NATIONAL MUSEUM vol.86 



discal cell, the lower basal corner of the first submarginal cell, the 

 apices of the two basal cells and of the anal cell, the basal parts of 

 the first, second, and third posterior cells, and most of the fourth 

 and fifth posterior cells; this is darker toward the stigma than 

 near the posterior margin of the wing. Abdomen concolorous with 

 the thorax ; the pile mostly whitish and semiappressed ; however, there 

 are some scattered erect black hairs on the posterior tergites; no 

 lateral spots of silvery appressed hair. Length, 8 imn. 



HoJotype. — Female, Caiio Saddle, Gatnn Lake, Panama, May 13, 

 1923 (R. C. Shannon). U.S.N.M. No. 52761. 



A group of six Neotropical species of Cyphomyia has the body 

 bright metallic blue or bluish, the wings deeply and uniformly in- 

 fuscated with black, the antennae wholly black, and the legs (except 

 in some specimens the base of the middle basitarsi) black, or metallic 

 blue. The black posterior basitarsi offer a good character for separat- 

 ing some of these species from related ones. The following key will 

 separate the females of the six species of this group : 



1. Face black nigritarsis Enderlein 



Face yellow 2 



2. Ocellar triangle situated on posterior margin of vertex ; a black 



stripe connecting it with neck leucocephala Hoffmanscgg 



Ocellar triangle remote from posterior margin of vertex ; the 

 space behind it wholly yellow 3 



3. Vertex with conspicuous golden pile zernyi Lindner 



Vertex with inconspicuous whitish pile or bare 4 



4. Vertex elevated in middle, depressed laterally, ocellar triangle at 



anterior end of prominence ; scutellar spines white or j-ellow on 



at least apical half ecuadorensis Enderlein 



Vertex lies below level of ocellar prominence, at least immedi- 

 ately behind it; scutellar spines at most tipped with yellow 5 



5. Ocellar triangle situated in a slight depression on front; front 



not elevated, but flattened and without a median trough. 



planifrons, new species 

 Ocellar triangle elevated above vertex; front elevated laterally, 

 with a median trough running from ocellar triangle to base of 

 antennae altifrons, new species 



CYPHOMYIA ECUADORENSIS Enderlein 



Seven females, Bogota, Colombia (B. Guevara). 



CYPHOMYIA PLANIFRONS. new species 

 FiGUKE 71, & 



Female. — Head yellow. Relative width of front at anterior 

 ocellus, front above insertion of antennae, face inmiediately above 

 oral margin, occipital orbit at upper corner of eye, and occipital orbit 

 at center of eye, 30:23:28:20:17. Vertex separated from occipital 



