70 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



although they differ considerably in size. Both have no 

 acrostichal bristles, both have six mesial dorsal bristles in a 

 row, and both have well developed humeral bristles, the 

 transverse row of the latter, to which Mik has called atten- 

 tion, being very distinct in pectinifer . This species has four 

 scutellar bristles, but neglectus has only two. This import- 

 ant character must be omitted from Mik's characterization 

 of Schcenophilus, if this species, as seems to me advisable, 

 is to be placed in the genus Thmophtlus. If this is done, 

 the genus Schoenofhilus will appear to be established on 

 rather insufficient characters. 



70. Thinophilus neglectus, sp. nov. 



Female. Length 2.75-3.5 mm.; length of wing 2.5-2.75 mm. Proboscis 

 black, not very prominent, in some specimens much retracted. Palpi large, 

 pale yellow, covered with silvery white dust. Ground-color of the broad face 

 dark, but almost completely concealed by a thick layer of white dust. Anten- 

 nae yellow, third joint rounded, reddish brown towards the tip and covered 

 with pale pubescence; arista bare, distinctly dorsal, pale yellow. Front thickly 

 overlaid with brownish yellow dust; on the occiput and cheeks the dust is 

 gray. Postocular cilia black above, silvery white below, abundant. Thorax 

 and scutellum opaque with a thick layer of dull brownish yellow dust. 

 Acrostichal bristles absent, six mesial dorsal bristles in a row on either side; 

 humeral bristles well developed, but not forming a conspicuous transverse 

 row on either side. Scutellum with only two bristles. Abdomen with five 

 visible segments, pale metallic green, thickly covered with silvery white dust 

 and with short white hairs. Ovipositor blackish above, yellow below, ter- 

 minating in a comb of ten small black teeth. Pleurae, coxae and bases of the 

 femora silvery with white dust, the dark ground-color of these parts being 

 almost completely hidden. Coxae infuscated, with yellow tips; fore coxae 

 with numerous conspicuous white hairs on their anterior surfaces. There 

 are similar hairs above the insertions of the fore coxae and on the anterior 

 surfaces of the middle coxae. Legs yellow, rather short. Basal third to two- 

 thirds of the femora more or less infuscated. In some specimens the bases of 

 the hind tibiae are also infuscated. Tips of the separate tarsal joints blackish, 

 fourth and fifth joints entirely black, rather broad, with large pulvilli. Femora 

 clothed with delicate white hairs and beset with a few black bristles near 

 their tips. There are also short silvery white hairs on the tibiae and tarsi in 

 addition to the usual black bristles. Wings rather opaque whitish or, in some 

 specimens, more hyaline, yellowish towards the costa, with yellow veins. 

 Some specimens have a distinct dark cloud on the posterior cross-vein and a 

 similar cloud on the gently up-curved middle of the distal segment of the 

 fourth vein. Tegulae and halteres light yellow. The cilia of the former are 

 pale and extremely short. 



