3gg HTMENOPTERA. 



the basal segment is longer than wide, and is of equal breadth throughout, its base is 

 oblique, the segment bearing large deep punctures, and sparsely covered with long 

 black hairs ; the second segment is moderately strongly punctured, and bears longish, 

 depressed, stiff black hairs ; the third and fourth segments are punctured, and covered 

 with long black hair; the fifth segment is densely covered with silvery pubescence ; 

 the pygidium is covered with long black hairs, its middle being indistinctly carinate. 

 The ventral surface is entirely black ; the keel on the basal segment is distinct, and 

 projects at the base into a blunt triangle ; the second segment is moderately strongly 

 punctured, and is sparsely covered with pale hairs ; the other segments are much more 

 finely punctured, and more densely covered with longer pale hairs ; the hypopygium 

 is more strongly punctured, and is sparsely covered with black hairs, its base is 

 depressed and oblique, the middle bluntly keeled, the keel becoming narrower and 

 more distinct towards the apex. The legs are black, and are covered with silvery 

 pubescence ; the calcaria are black. The wings are fusco-violaceous throughout ; the 

 radial cellule is elongate, but does not reach the apex of the third cubital cellule ; the 

 first abscissa of the radius is sharply oblique, the apical abscissa straight or nearly so ; 

 the first cubital cellule is shorter than the radial ; the second cubital cellule is much 

 longer than the first, but not longer than the radial; the third cubital cellule is 

 distinct, and is much narrowed at the bottom, where it is hardly half the length of the 

 top of the second cellule ; at the top the latter is as long as the space bounded by the 

 first transverse cubital and the first recurrent nervures ; the first recurrent nervure is 

 received shortly beyond the basal third of the cellule ; the second recurrent nervure is 

 interstitial. The tegulse are large, longer than wide, and bear large deep punctures. 

 Characteristic of this species is the tooth on the base of the scutellum. 



119. Sphserophthalma perfidiosa. 



Nigra ; abdominis basi late rufo ; capite et tborace longe albo-hirtis ; alis fumatis. <$ . 

 Long. 11-13 millim. 



Hab. Mexico, Tepetlapa in Guerrero 3000 feet (H. H. Smith), San Bias (Schumann). 



The head nearly as wide as the thorax, slightly rounded in front and behind, punc- 

 tured, densely covered all over with long dull griseous hair ; the space behind the eyes 

 hardly one-half their length ; the antennal tubercles and the mandibles black, the 

 latter bearing long white hair. The antennae shorter than the head and thorax united, 

 stout, black; the scape covered with long pale hair; the third joint a little longer than 

 the fourth. The thorax is more than twice the length of- the head, not much narrowed 

 behind ; the pronotum densely covered with a silvery pubescence and with long silvery 

 hair ; the mesonotum coarsely punctured and covered with long fuscous hair ; the 

 scutellum covered with long silvery hair ; the median segment with a rounded slope 

 and reticulated, the base with a dense, short, pale fulvous pubescence, the rest of the 



