44 PROCEEDINGS OF THE NATIONAL MUSEUM vol. G8 



OPSIDIA METOPIOIDES, new species 



Front at narrowest point, in single specimen measured, 0.35 of head 

 width; inner orbits most nearly approximated at base of antennae, 

 diverging moderately and equally to vertex and bucca; frontal vitta 

 black, narrowest at base of antennae, sides diverging to vertex, vitta 

 at level of lowest ocellus, slightly wider than either parafrontal; 

 parafrontals gray pollinose; about thirteen bristles in the single 

 frontal row, which extends downward as far as base of second anten- 

 nal joint; one reclinate and two proclinate orbital bristles, which are 

 much stronger than bristles in frontal rows; sparse bristly hairs on 

 front outside of macrochaetae ; vibrissae inserted one and one-half 

 times length of second antennal joint above front edge of oral margin; 

 facial ridges nearly parallel; bearing two bristly hairs just above the 

 vibrissae; antennae extend five-sixths the distance to vibrissae; 

 second joint red; third joint black, four times as long as second; 

 arista thickened on basal two-fifths; in profile, width of bucca equals 

 that of parafacials, and is one-sixth eye height, front protrudes one- 

 third the eye diameter; parafacials with sparse microscopic hairs. 

 Bucca with very fine, black hairs; palpi yellow. Thorax golden 

 pollinose over black, with three somewhat obscure black vittae, 

 perceptible to scutcllum; three postsutural dorsocentral bristles of 

 which the first is scarcely larger than the surrounding bristly hairs; 

 seutellum uniformly pollinose, with three pairs of marginal bristles; 

 prescutellars scarcely differentiated. Abdomen black, the bases of 

 the last three broadly, and the first segment entirely, pollinose; first 

 and second segments each with a pair of median marginal bristles; 

 third and fourth with median marginal rows of ten to fourteen 

 bristles. Genitalia black. Wings hyaline; penultimate section of 

 fourth vein equaling three-fifths the preceding section; hind cross- 

 vein nearly parallel to section of fourth vein be3^ond the bend; third 

 vein witli row of small bristles extending nearly to small cross-vcm. 

 Legs black; pulvilli half as long as last tarsal joint. 



Length, 7 mm. 



Type.— Male, Cat. No. 28152, U.S.N.M. 



Described honi one male, Porto Bello, Panama, April 22, 1912. 

 (A. Busck.) 



Genus OPSIDIOPSIS Townsend 



Opsidiopsis Townsend, Proc. U. S. Nat. Mus., vol. 5G, p. 544, 1919. Geno- 

 type, oblaia Townsend, from Wild Horse Canyon, Animas Mountains, New 

 Mexico. 



This genus was erected by Townsend to receive a single species 

 having the habitus of Opsidia from which it is readily distinguished by 

 the row of bristly hairs on the first vein and the last section of the 

 fifth vein being distinctly more than half as long as the preceding 

 section. The presence of the bristly first vein is unique, serving to 



