Zool.-Vol. I.] U'HEELER—MAR'l7 r s¥E DOLICHOPODIDAi. 147 



near their tips, black. Each of these appendages bea^ a piceous or gray 

 lamella on its antero-lateral edge above the angle. This laiTfilla is fringed 

 along its edge with weak hairs, the appendages with stubby black, bristles, 

 which are especially abundant on the mesial surfaces. The inner appenda^s 

 are yellowish, the sinuate penis short and broad, with its point directed for- 

 wards. In life the hypopygium is folded up against the ventral surface of the 

 fourth to sixth abdominal segments, somewhat like the blade of a closed 

 pocket-knife. In this position both the inner appendages and the tips of the 

 outer appendages are invisible. Legs black (in alcoholic specimens piceous), 

 with a dull metallic green reflection, especially on the femora, and bristly 

 with black hairs. The ground color of the legs is obscured by a layer of pale 

 dust. Fore coxae with conspicuous black hairs on their anterior surfaces; 

 fore femora somewhat thickened proximally, with about a dozen prominent 

 black spines below directed at right angles to the surface. The fifth joint of 

 all the tarsi somewhat broader than the other tarsal joints. First joint as long 

 or nearly as long as the second to fourth joints taken together. Fore tibia 

 with a strigil-like comb of pale hairs near its distal end on the inner side. 

 Hind femur with a few long bristles near its tip on the outer side; middle 

 tibia with a few similar bristles near the proximal end on the outer side. 

 Wings gray, rather opaque, with faint traces of a darker cloud on the poste- 

 rior cross-vein, which is at right angles to the fourth longitudinal vein and 

 scarcely more than its own length distant from the posterior margin. Ter- 

 minal segments of the second to fourth veins parallel and slightly bent. Sixth 

 vein short but distinct. Anal angle of the wing not very prominent. Hal- 

 teres pale yellow throughout. Upper cilia of the piceous tegulas white, lower 

 cilia black. 



Female. — Length of the body 3-3.5 mm.; length of wing 3.5-4 mm. Dif- 

 fers from the male in having a somewhat broader face, in the absence of the 

 spines on the lower surfaces of the fore femora, and in the shape of the abdo- 

 men, which is much swollen in my specimens and consists of only five visible 

 segments. Its tip, provided with the small black or piceous ovipositor; is 

 turned upwards. 



Of this, the most abundant of the three species, I have 

 collected 200 specimens, 100 of either sex. The flies are 

 gregarious, and seem to feed on the small animals which 

 they find among the fronds of the Fucus and Endocladia 

 on the rocks. The females are more common than the 

 males. From July 1st to August 5th, 1896, this species was 

 observed almost daily at Pacific Grove, California, and along 

 the coast to the southward as far as Point Lobos. It was 

 also seen, January 15th to March 10th, in smaller numbers, 

 at Point Loma and La Jolla, San Diego County, California. 

 It will probably be found to occur throughout California 

 wherever the coast is rocky. 



