230 MAINi: AGRI CULTURAL EXPERIMENT STATION. I909. 



black stripes, the lateral ones abbreviated in front. Scutellum 

 yellow, with the margin brownish. Pleura in part pitchy- 

 brown. Metanotum light yellow above, brown on the lower 

 part. Abdomen : first segment and the venter light yellow ; 

 second to seventh segments, inclusive, shining black, with the 

 hind margin yellow or yellowish, and clothed with yellow hair ;. 

 remainder of abdomen black, with less abundant yellow hair; 

 hypopygium yellow, with the superior organs blackish. Legs 

 yellow ; 4 posterior coxse brownish ; hind femora, tip of the 

 hind tibiae, the hind tarsi, and the tip of the middle tibise black; 

 middle tarsi brownish ; front tibiae with weaker bristles ; all 

 the tibiae with spurs, the hind pair with long and stout ones. 

 Wings light yellow, with brown markings as follows : the 

 whole of the costal cell, except sometimes a spot at the begin- 

 ning of the yellow distally, the broad distal and narrow pos- 

 terior margin, and a moderately broad band near the middle 

 of the wing; the subcostal vein vanishes in a fold that ends 

 about opposite the beginning of the radial sector; the radial 

 sector forks before its middle, the media a little beyond the 

 middle of the petiole of the radial sector; the costal vein ends 

 at the tip of R4+5. Mexico, Sierra de las Aguas Escondidas in 

 Guerrero, 7000 feet. 



4. Symmerus mexicana Giglio-Tos. 

 1890. ni'exicana Giglio-Tos, Boll. Mus. Zool. Anat. Comp. 

 Torino. V. No. 84. (Ditomyia). 

 Male. Length 10 mm. Face and front yellow ; eyes black, 

 3 ocelli, distant, placed in a right line upon a black spot; 

 antennae yellow, subfuscous toward the tip, longer than the head 

 and thorax conjointly. Thorax yellow, reddish upon the center 

 of the mesonotum. Abdomen black, with yellow pile, sub- 

 clavate posteriorly, the whole of the first, and the posterior 

 margins of the second and third, yellowish. Legs yellow, tarsi 

 fuscous, each tibia with fuscous apex. Wings yellow, sparsely 

 tomentose; longer than the abdomen, with 2 fuscous fasciae, 

 the first filling the basal half of the costal cell and extending 

 across the disk of wing between the crossveins and the base of 

 the fork of the media; the second broadly covers the apex of 

 the wing. Halteres yellow. Recorded by Giglio-Tos from 

 Orizaba, Mexico. 



