310 PROCEEDINGS OF THE ACADEMY OF [1895. 



times, in the female three times as loug as the second; arista bare, 

 the penultimate joint not longer than broad; head at insertion of 

 vibrissa half as long as at base of .antennae, face in profile convex, 

 the sides bare, each at the narrowest part one-eighth as wide as the 

 median depression, ridges bristly on the lower four-fifths; vibrissa? 

 widely separated, inserted on the oral margin; cheeks one-seventh 

 as broad as the eye- height, the lower half covered with short bristly 

 hairs, the usual row of macrochaetae on the lower border; eyes micro- 

 scopically pubescent; proboscis robust, the portion beyond the basal 

 articulation not half as long as height of head, labella very large; 

 palpi clavate, well-developed. Abdomen oblong-oval, of four seg- 

 ments which are subequal in length. Hind tibia? outwardly ciliate 

 with short bristles intermixed with two or three longer ones. Third 

 vein bearing a few bristles at the base, the others bare; apical cell 

 open, ending at four-fifths of the distance betwwen the second vein 

 and the extreme wing-tip; bend of fourth vein obtuse, destitute of 

 an appendage; hind cross vein slightly nearer to the bend than to 

 the small cross vein, its posterior end nearer to the wing-margin 

 than to the small cross vein. Type, the following species: 



Pseudochaeta argentifrons n. sp. $ <? • 



Black, including the mouth parts. Front at vertex about as wide 

 as either eye, vitta next the antennae two-thirds as wide as either 

 side of the front, the latter and the face densely silvery pollinose, 

 antennal arista thickened on the basal third. Thorax gray polli- 

 nose; marked with four black vittae; four postsutural and two sterno- 

 pleural macrocbaetae; scutellum bearing three pairs of long marginal 

 and a pair of short apical macrocbaetae. Abdomen shining except 

 the grayish pollinose bases of the last three segments; first two 

 segments each with a marginal pair of macrochaetae, third with a 

 marginal row, the fourth with scattered macrochaetae except on the 

 basal fourth; genitalia not projecting. Pulvilli scarcely half as 

 long as the last tarsal joint. Wings hyaline, calypteres grayish 

 white. Length 5 mm. Charlotte Harbor, Florida (Mrs. A. T. 

 Slosson), and Los Angeles, California (D. W. Coquillett). Four 

 males and three females. 



Achsetoneura rubentis n. sp. 9 . 



Front at vertex three-fourths as wide as either eye, the vitta 

 blackish, next the antennae slightly narrower than either side of 



