830 I'liOCEEDINCS OF TIIK XATIOSAI. MUSEUM. 



tniM(!iito(l; iuistii black, tliic-kcncd on its basal two-thirds, the first 

 joint almost as lonj"' as broad, tlie second three times as lonj? as broad; 

 l)ali)i slciKler, linear, yellow, i)i'obos('i.s black. Thorax black, oi)aque, 

 densely brownish yellow prninose, marked with four indistinct black 

 vittae, thickly covered with short, i)ale yellow hairs, lour pairs of postsu- 

 tnral dorso-ccMitral nia<'rochaeta(^ and thiec^ sternopleural ones; scntel- 

 lum yellow, o[)a(ine, browisli-yellow i)rninose, coNcred with short, yellow 

 hairs and, except at the base, with black macrochaeta, the margin bear- 

 ing three ])airs of longer ones. Abdomen yellow, snbopaqne, brownish- 

 yellow prninose, thicikly (jovered with short, pale yebow hairs, the first 

 segment, except the postei'ior angles, and th(^ middle of the second 

 black, the haiis on the black i)ortions, and for a short distance outside 

 of them, also black; first segment bearing six marginal nnicrochaetae 

 near the middle of tln^ dorsum, the second and third each with a. mar- 

 ginal row, the fourth with a discal and a marginal row. Femora black, 

 apices, tibiae, and bases of tarsi yellow, apices'of tarsi brown, tarsi not 

 dilated. Wings grayish-hyaline, the (;ostal nuirgin and border to the 

 veins pale yellowish, the third vein bearing live bristles near its base, 

 elsewhere the. veins are bare. Calypteres yellowish-white. 



Length, LM) mm. A single specimen (No. TM\). 



Typc.—^o.myi, II.S.N.IM. 



SKRVILLIA POLITULA, new species. 



Male: Head black, opatpie, sides of front brownish i)riiinose, no orbi- 

 tal bristUvs, frontals in two iirregular rows, extending to base of second 

 antennal Joint, (xjellar bristles slender, hairs of front, sides of face, 

 upper part of (cheeks, and on the occiput next the eyes chiefiy black; 

 face, cheeks, and occii)nt yi^llowishgray prninose; antennae reaching 

 slightly below lowest fourth of the fa<'e, black, the third joint almost as 

 long as the second, widening toward the tip, which is broadly rounded; 

 arista thickened on the basal two-thirds, the first joint noticeably 

 longer than broad, the second nearly three times as long as wnle; palpi 

 slender, linear, yellow, the proboscis bhuik. Thorax black, slightly 

 ]»olished, very thinly gray prninose, thickly covered with rather long 

 black hairs, on the lower i)art of the ])leura with pale yellow ones; 

 four i)airs of i)ostsutuial «lorso-cenrral macrochaetae and tlnee sterno- 

 jdenral ones; scutellnm polished, brown, thickly covered with rather 

 long black hairs, which on the posterior portion are intermixed with 

 nmcro(!haetae, the margin .bearing four pairs. Abdomen highly pol 

 ished, reddish yellow, the lirst segment, except its posterior angles, 

 a broad dorsal viltai on the second and third, and the whole of the 

 fourth, black; hairs of abdimien rather dense, becoming h)nger toward 

 the apex, thos(^ on the lirst two segments black, on the posterior angles 

 of the second and on the third and fourth bright yellow, intermixed 

 with several black ones at the apex of the fourth, those of the venter 

 chietly black; lirst segment bearing eight marginal macrochaetae near 



