ZooL— Vol. II.] WHEELER— DOLICHOPODID^. 29 



Three male and eleven female specimens swept from the 

 dry ferns in the pine-woods about Pacific Grove, Calif., 

 during July, 1896. 



This species, in general appearance and in neuration, 

 resembles the species of Thrypticus {Aphantottmus 

 Wheeler). 



31. Medeterus aurivittatus, sp. nov. 



Plate II, Fig. 47. 



Male. Length 2.5 mm.; length of wing 2.75 mm. Proboscis moderate, 

 glabrous, black, with white hairs. Palpi and face black, the latter above the 

 suture dull metallic blue, covered with gray dust, which is thickest at the 

 suture and just below the insertions of the antennas. Antennae black, of the 

 usual form. Front opaque, with a thick layer of light gray dust. Postocular 

 cilia white. Thorax opaque, with light gray dust, with the black bristles well 

 developed and with three subequal golden yellow or light brown stripes ex- 

 tending back as far as the anterior edge of the prescutellar depression. Scu- 

 tellum and abdomen dark steel blue, somewhat shining, covered with a thin 

 layer of gray dust. Scutellum with four prominent bristles. Hairs covering 

 the abdominal segments white except those along the posterior edge of each 

 segment, which are black. Hypopygium as long as the abdomen, well devel- 

 oped, glabrous, black, with white hairs on its basal portion; appendages 

 rather thick and short, yellow. Pleurae greenish black, thickly covered with 

 gray dust. Coxa; and legs black; knees and basal two-thirds of middle 

 metatarsus yellow. Bristles above the base and hairs on the anterior surfaces 

 of the fore coxae white. Hind metatarsus plain, second joint about one and 

 one-half times as long as the metatarsus. Wings hyaline, veins black, yellow 

 at their bases. Venation normal. Distal portion of fifth vein but little longer 

 than the posterior cross-vein. Halteres and tegulae whitish, the latter with 

 white cilia. 



Female. Length 2.75 mm.; length of wing 2.75 mm. In coloration the 

 female closely resembles the male. The ovipositor, which is extruded in my 

 specimens, is rather short and thick. 



Two males and three females collected by J. M. Aldrich 

 at Moscow, Idaho. 



32. Medeterus appendiculatus, sp. nov. 



Plate II, Figs. 41-43. 



Male. Length 2.5 mm.; length of wing 2 mm. Proboscis of moderate 

 size, shining black. Palpi black. Face opaque with gray dust; on the front 

 the dust is more yellowish gray. Antennas black; arista apical, but little 

 longer than the face. Postocular cilia whitish. Thorax opaque gray, more 

 yellowish in front of the prescutellar depression. The acrostichal bristles are 



