TEXAN HYMENOPTERA. 217 



Tacliytes obscnrus, n. sp. 



£. — Black; face and clypeus clothed with a dense silvery pubescence ; 

 prominence above lower ocellus divided centrally by an impressed line, and 

 behind it a lunate excavation or depression; back of head and cheeks with a 

 silvery sericeous pile; posterior margin of prothorax silvery; lateral and pos- 

 terior margins of mesothorax, pleura and metathorax with a silvery sericeous 

 pubescence, longer on metathorax, which has a small fovea at apex above and 

 a central groove on posterior face; tegulae dull testaceous; wings hyaline, 

 faintly dusky at apex; legs black, tibiae and tarsi silvery sericeous; abdomen 

 black, smooth and shining, more or less sericeous, base of first segment with a 

 rather long, thin white pubescence, lateral apical margins of segments 1 — 3 

 more or less silvery sericeous, apical segment with dense golden pubescence. 

 Length .55 inch. 



Three specimens. (Belfrage.) Easily distinguished from the other 

 species by the apical segment of abdomen only being golden, the 

 clothing of the remainder of body having a silvery lustre. 



Tacliytes texanus, n. sp. 



%. — Black, clothed with an erect white pubescence, face and clypeus 

 densely silvery ; vertex as in olxcurus ; mesothorax and seutellum finely and 

 distinctly punctured, lateral and posterior margins and posterior margin of 

 prothorax more or less silvery in certain lights; metathorax with long white 

 pubescence, a smooth shining shallow fovea on apex above and a short deep 

 fissure on upper half of posterior face; tegulae dull luteous, obscure at base; 

 wings hyaline- legs black, with a silvery sericeous pile, especially dense on 

 tibia?, apical joints of tarsi more or less fulvous ; abdomen convex, with a thin 

 glittering pile, segments 1 — 4 each with a silvery sericeous band on apical 

 margin more or less interrupted medially; apical segment bright silvery 

 Length .40 — .45 inch. 



Five specimens. (Belfrage; Boll.) This is our smallest species. 



Tacliytes abdominalis. 



Larra abdominalis, Say, West. Quar. Eep. ii., p. 77. 

 Six 9 specimens. (Belfrage; Boll.) 



Tacliytes rufo-fasciata, n. sp. 



%. — Black; face, clypeus, posterior margin of prothorax, lateral and pos- 

 terior margins of mesothorax, postscutellum, sides of metathorax and pleura 

 more or less, silvery; mandibles yellow-ferruginous, rufo-piceous at tips: ver- 

 tex as in obscurus; metathorax sculptured as in texanus ; tegulse luteous ; 

 wings subhyaline, stained along the nervures with yellowish, nervures honey- 

 yellow; legs fulvous, coxae black, tibiae silvery sericeous; abdomen black, 

 basal segment with a silvery sericeous pile; narrow apical margin of first seg- 

 ment and second segment except basal margin reddish-fulvous, apical margin 

 of remaining segments pale testaceous, apical segment silvery. Length .45 

 inch. 



One specimen. (Coll. Gr. W. Belfrage.) May be the S of ab- 

 dominalis, Say, although the legs are fulvous. 



TRANS. AJIER. ENT. SOC. IV. (2S) NOVEMBER, 1872. 



