372 HYMENOPTERA. 



apex, and all the other segments also, thickly covered with long rufo-fulvous hair. 

 The pygidium is black. The ventral segments are entirely black, and are sparsely 

 covered with long pale hair; the basal segment has no keel, the centre being quite 

 flat, and is coarsely punctured ; the second segment is strongly, the others at the apex 

 finely, punctured. The legs are black, and are covered with long, soft, pale hairs ; the 

 calcaria are black. The wings are smoky, lighter coloured in the centre; the radial 

 cellule is wide and projects a little beyond the third cubital ; the first abscissa of the 

 radius is straight and oblique, the apical abscissa very slightly curved, especially 

 beneath ; the first cubital cellule is a little longer than the radial ; the first transverse 

 cubital nervure is curved, the second oblique ; at the top the second cubital cellule is 

 about the same length as the space bounded by the first transverse cubital and the 

 recurrent nervures, the latter being received in the basal third of the cellule ; the third 

 transverse cubital nervure is broken off near the top. 



123. Sphaerophthalma thalia. 



Nigra ; abdomine ferrugineo, basi et apice nigris ; capite, prothorace, metanoto, mesopleuris petioleque longe 



albo-hirtis; alis fuscis. c?. 

 Long. 15 millim. 



Hal. Mexico, Chilpancingo 4600 feet and Venta de Zopilote 2800 feet, both in 

 Guerrero {H. H. Smith). 



Head distinctly narrower than the thorax, rounded in front and behind, densely 

 covered all over with long greyish hair ; the mandibles and the antennal tubercles 

 black. The antennae are shorter than the head and thorax united, punctured, covered 

 with long white hair ; the third and fourth joints are subequal. The thorax is more 

 than three times the length of the head ; the prothorax densely covered with dull 

 griseous pubescence; the mesonotum covered with black depressed hair, coriaceous; 

 the scutellum covered with long griseous hair ; the median segment with a gradual 

 rounded slope, and covered all over with griseous hair, which hides the sculpture. The 

 pleurae densely covered with griseous hair ; the metapleurae reticulated, and with the 

 hair longer. The abdomen ferruginous, except the basal and apical segments, which 

 are black. The basal segment longer than broad, becoming dilated towards the apex ; 

 coarsely punctured and covered with long pale hair ; the second segment closely punc- 

 tured and thickly covered with long pale hair ; the apices of the segments fringed with 

 rufous hair ; the pygidium black, coriaceous, and fringed with long stiff hair. The 

 basal ventral segment black, punctured ; the basal half of the keel straight, the apical 

 half raised gradually to the apex. The second ventral segment strongly punctured and 

 covered with pale hair ; the third and fourth segments thickly covered with longer pale 

 hair ; the fifth and sixth segments black, punctured, and covered with long black hair. 



