532 PROCEEDINGS OF THE NATIONAL MUSEUM. voi,. xxix. 



fulvous-brown; the sides and ventral surface of second seg-ment and 

 lateral patches and ventral fringe on third segment silverv; wings 

 vellow-hyaline, the veins and cilia brown. Fore wing with the area 

 in front of the median nervure and vein 5 brown, the cell with the 

 scales less dense toward base; the inner area with brown fascia 

 expanded to vein 1 except on outer third. Hind wing with fulvous 

 costal fascia, and the front of cell rather thinly clothed with brownish 

 scales. 



Expanse. — 28-30 nnii. 



Ilahitat. — Suapure, Venezuela. 



Types. — Cat. No. 8403, U.S.N.M., ana in collection of the author. 



This species, as well as the next, belongs to the same generic sec- 

 tion as P. j)olistes Hiibner. 



PSEUDOSPHEX CAURENSIS, new species. 



Male. — Head fulvous-yellow; antenna^ tegula?, thorax, and legs 

 fulvous; lower part of frons and line behind eyes white; vertex with 

 black patch; mesothorax clothed rather thinly between dorsal line and 

 patagia; fore cox*, and streaks on fore and middle femort« silvery; 

 abdomen with- the first three segments and ventral valve fulvous, the 

 fourth segment with the ventral surface light fulvous, the upper sur- 

 face and following segments black; the first segment with subdorsal 

 black lines, the second and thii'd dorsal segments narrowly edged, and 

 the fourth dorsal segment irrorated and broadly edged with fulvous- 

 yellow; the ventral valve and the third ventral segment fringed Avith 

 white; wings fulvous-hyaline, the veins fulvous. Fore wing with 

 costal and inner fascia fulvous and the outer end of cell and area for- 

 ward of vein 5 somewhat irrorated. Hind wing with fulvous costal 

 fascia. 



l^xpanse. — 30-32 umi. 



Habitat. — Suapure, Venezuela. 



Types. — Cat. No. 8404. U.S.N.M., and in collection of the author. 



PSEUDOSPHEX POLISTES, Hubner. 



Hahltat. — Suapure, Venezuela. 



SPHECOSOMA GRACILIS, new species. 



Male. — Head, thorax, and legs orange; palpi in front with some 

 whitish scales; antenme with the shaft reddish and the branches dark; 

 spot on vertex, band on back of head, patches on tegul;\?, stripes on 

 patagia, and large patches on meso- and meta -thorax lilack; pectus 

 with white spots; fore coxa? whitish at base; abdomen fulvous above 

 and lighter below, the segments fringed with fulvous-yellow; the front 

 of first segment with a black bar expanded at middle into a short 

 dorsal stripe not reaching second segment; the tubercles with a few 



