332 PBOGEEDINGS OF THE NATIONAL MUSEUM. 



scndiiifi" fivo spurs from Its posterior sido; tliroc pairs of postsutural 

 (lorso central iniicrocliaetao iuul tliree steriiopleiiral ones; sentelliini 

 velvet-black, bearinj;: tliree ina,r}>ina] i)aiis of lonj;' niacrocliaetae. Ab- 

 domen yellowisli-<>r;iy pruinose, tlie lirst segment except the jiosterior 

 margin, a larftv sjmt on the second extending nearly its entire length, 

 and a similar spot on the third segment, velvet-black; venter laigcly 

 velvet-bliick; first segment of abdomen bearing marginal, the second 

 and third with discal ami marginal macrocbaetae, the bristly hairs 

 long and snl>er(M't. Front i)nlvilli as long as the last tarsal Joint. 

 Third vein hearing one or two bristles near i(s base, elsewhere the 

 veins are bare. 



Length, (I to 7 mm. Three si)ecimens (No. 1\'A). 



TyiK.—^o. 4004, r. S.N. INI. 



HYPOSTENA VITTIGERA, new species. 



Male: Differs from the above description oi s'uiniferu only as (bllows: 

 Cheeks one seventh as broad as the eye height, marked with an oblique 

 brown streak antei'iorly, in place of the vittai; third Joint of antennae 

 more than thrc^e times as long as these(H)nd. Thorax marked with five 

 velvet-black vittae inlerrnpted at the suture, the three middle ones 

 united at their front, ends and again behind the suture; sculellnm, on 

 nearly its apical hall, gray [»iuinose; aii)ex of fourth segment of abdo- 

 men polished, black, veuter largely gray i)ruinose. Female <litfers from 

 the male as follows: I-'ront almost as wide as either eye, two pairs of 

 orbital bristles; front pnlvilli less than one half as long as the last 

 tarsal Joint. Length, 10 to 1! mm. Two males and one lemale (No. 

 74L>). 



7V//X'.— No. 400;% H.S.N.M. 



l-aniily DEXllDAE. 

 DEXIA FLAVIPES, new species. 



Male: lUack, the antennae, face, cheeks, palj)!, apex of proboscis, 

 abdomen, excel)! a dorsal vitta, femorai, and tibiae, yellow : frontcalyp- 

 teres white, the hind ones yellowish; wings hyaline, tinged with yel- 

 lowish at the base and in the region ol" the costa. Vvo\\\ at narrowest 

 part one-tifth as wide as either eye, the sides yellow pruinose, no orbital 

 bristles, frontals in single rows, descending to insertion of antennae; 

 face and cheeks pale yellow i)ruinose, sides of face bare, cheeks 

 slightly more than one-third as broad as the eye height, vibrissae 

 slightly above the level of the front margin of the oral opening; auten- 

 uae two-thirds as long as the face, the third Joint three times as long 

 as the second, longest hairs of arista more than four times as long as 

 its greatest diameter. Thorax yellowish gray i)ruinose, marked with 

 four black vittae; three pairs of postsutural dorso-ceutial macrochaetae 

 and two sternopleural ones; scutellnm bearing three long marginal 



