AMERICAN HYMENOPTERA. 



101 



a bifurcate line on base of scutellum of dense whitish pubescence; scutellum 

 (fig. 1) smooth and polished, impunctured, large, projecting over the meta- 

 thorax, depressed on the middle, the tip with a broad, flat obtuse tooth, lateral 

 teeth long, slightly divergent and subacute; tegulse, the sharp transverse sub- 

 sinuate carina in front, and the legs, fulvo-ferruginous; wings dusky, broadly 



fuliginous on apical margin; legs with short 

 white pubescence, posterior femora, tibise and 

 tarsi varied with black, middle trochanters 

 elongate, subcylindrical when viewed laterally; 

 abdomen smooth and polished, with scattered 

 punctures; segments 1 — 5 each with a narrow 

 apical fringe of white pubescence; sides of first 

 segment broadly ferruginous; apical segment (fig. 4) long, finely punctured, 

 gradually narrowed to tip which is slightly turned up, a fine central longi- 

 tudinal carina, and on each side before apex a short fringe of ochraceous 

 pubescence; venter ferruginous, with scattered deep punctures, a well defined 

 central longitudinal carina on segments 2 — 5, the fifth segment elongate, 

 acutely conical and fringed at tip with ochraceous pubescence; apical seg- 

 ment (fig. .3) long and narrow, much longer than upper segment, and in- 

 curved, sides parallel nearly to apex which is rounded, with a slight notch 

 on each side, the base fringed with jjubescence, (fig. 2, apex in profile). 

 Length .50 inch. 



Hah. — Mexico, (Suruichrast). A very distinct species. 



Ccelioxys otoinita. — 9 . — Black, smooth and polished ; head as described 

 in zapoteca exce]3t that the clypeus is flat, nearly nude, with a fringe of dense 

 pale ochraceous pubescence at tip; eyes with very short pubescence; meso- 

 thorax smooth, with deep scattered punctures on the sides; anterior margin of 

 thorax, continued beneath, spot behind tegulse, and band at base of scutellum, 

 of dense, appressed, pale ochraceous pubescence; scutellum large, projecting 

 over the metathorax, depressed, obtusely angular behind, the tip slightly 

 recurved, lateral teeth slightly divergent, obtuse; metathorax with long pale 

 pubescence; transverse carina in front of tegulee prominent, subsinuate; tegulse 

 and legs ferruginous; wings dusky, fuliginous at tip; legs clothed with short 

 white pubescence, posterior tarsi dusky above, spines on anterior coxse short 

 and acute, middle trochanters elongate, subcylindrical when viewed laterally; 

 abdomen smooth and polished, with a few scattered punctures, 

 basal margin of the first, and apical margin of segments 1 — 5 

 with a narrow fringe of white pubescence, extreme sides of first 

 segment red; apical segment rather closely and finely punctured, gradually 

 narrowed to tip, and curved in profile, a longitudinal roughened depression 

 on each side of the middle; venter ferruginous, shining, with large scattered 

 punctures, banded with white pubescence, fifth segment elongate, conical, 

 apical segment much longer than the upper, slender, incurved, gradually 

 narrowed to tip which is rounded, (figure, apex of abdomen in profile). 

 Length .45 inch. 



Hah. — Mexico, (Sumichrast). One specimen. The scutellum is 

 formed much like that of tolteca.^ while the apical sef>ments of the 

 abdomen resemble in outline viewed from above, those of zapoteca^ 

 but in profile are very different. 



