366 HYMENOPTERA. 



The head not much narrower than the thorax, rounded in front, transverse behind, 

 thickly covered with long griseous hair ; the antennal tubercles and the mandibles 

 black ; the space behind the eyes not half their diameter. The antennae black, the 

 scape bearing long white hair ; the third joint distinctly shorter than the fourth. The 

 prothorax covered with long griseous hair ; the mesonotum covered with shorter black 

 hair ; the scutellum and median segment thickly covered with long griseous hair, the 

 groove at the base of the former deep ; the median segment has an abruptly rounded 

 slope and is coarsely reticulated. The mesopleurse are coarsely reticulated, except at 

 the apex ; the metapleurse still more strongly reticulated. The abdomen is longer 

 than the head and thorax united ; the petiole is entirely black, coarsely punctured, 

 covered with long white hair ; the other segments are much less strongly punctured, 

 ferruginous, covered with long ferruginous hairs ; the apical segment is ferruginous, 

 except the extreme apex, which is black, its hair is long, soft, and pale. The ventral 

 segments bear long white hair. The legs are black, and are covered with long white 

 hair. The radial cellule is a little shorter than the first cubital, and does not reach to 

 the apex of the third cubital ; the apical abscissa of the radius is a little oblique. The 

 apical part of the wing is darker than the rest. 



117. Sphaerophthalma yucatana. 



Kigra ; abdominis segraento 2° late auranteo ; capite, thorace abdominisque apiee albo-hirtis ; alis fusco- 



violaceis. J . 

 Long. 13 millim. 



Hab. Mexico, North Yucatan (Gaumer). 



Head narrower than the thorax, a little rounded in front and behind, densely covered 

 all over with silvery pubescence ; the part behind the eyes hardly half their length ; 

 the antennal tubercles rufous ; the mandibles black. The antennae shorter than the 

 head and thorax united, stout, black ; the scape covered with silvery hair ; the third 

 joint shorter than the fourth. The thorax is more than twice the length of the head, 

 and is sharply narrowed behind the points of insertion of the wings. The pronotum 

 is finely and closely punctured, and is densely covered with dull silvery pubescence. 

 The mesonotum is coarsely punctured and covered with longish depressed hair ; at its 

 apex laterally it projects into stout, somewhat triangular teeth, the outer sides of which 

 are curved. The scutellu^m is densely covered with silvery pubescence. The median 

 segment has an abruptly rounded slope ; it is strongly reticulated, and the basal half 

 is covered with silvery pubescence. The pleurae are covered with silvery hair; the 

 rnesopleurse are finely punctured ; the apex of the metapleurse is reticulated. The 

 abdomen is longer than the head and thorax united, and a little longer than the 

 latter ; it is black, except a broad orange band, contracted in the middle, in the centre 

 of the second segment ; the petiole is coarsely punctured, the base oblique, the hair 



