SPH^EOPHTHALMA. 381 



narrow, the apical two-thirds dilated to more than twice the breadth of the base and 

 longer than the median segment. The rest of the abdomen somewhat ovate, shining, 

 impunctate, sparsely clothed (more thickly towards the apex) with long soft white hair. 

 Beneath, the petiole is somewhat triangular, smooth, almost glabrous; the other 

 segments are impunctate, very shining, and sparsely pilose. Except that the tibiae are 

 paler, the legs are ferruginous and very sparsely haired ; the anterior femora have a 

 paler, more yellowish tint than the others. The wings extend fully two millimetres 

 beyond the apex of the abdomen and are clear hyaline, the stigma black, the nervures 

 also dark ; the stigma is longer than the radial cellule ; the basal abscissa of the radius 

 is oblique, its apex also slightly oblique, with a short fork issuing from its base ; the 

 first and second transverse cubital nervures converge at the top, but do not quite unite, 

 and are both oblique ; the third transverse cubital nervure is only very slightly oblique 

 and is a little curved ; the cubital nervure ends at the apex of the third cubital cellule ; 

 the first recurrent nervure is received in the basal third of the cellule, the second 

 nearly in the centre ; both the recurrent nervures are curved. 



The following three species are very closely related ; they have only one recurrent 

 and two transverse cubital nervures, the second recurrent nervure being obliterated. 

 They are thickly covered with long white hair ; the antennae and legs are pallid yellow ; 

 the apical half of the abdomen is infuscated ; and the median segment is strongly 

 reticulated. I have only seen males of each species. 



1 (2). The breast with two tufts ; mesonotum coarsely punctured . . paron. 



2 (1). The breast without tufts ; mesonotum reticulated eubule, phylacis. 



137. SphaBrophthalma paron. 



Ferruginea, abdominis apice late nigro, longe albo pilosa ; pedibus pallide flavo-testaceis, apice tibiarum tar- 



sisque posticis nigris ; alis hyalinis, stigmate testaceo, nervis pallide flavis. d 1 . 

 Long. 14-15 millim. 



Hab. Mexico, Northern Sonora (Morrison). 



The head is a little narrower than the mesothorax, sparsely punctured, more strongly 

 on the front, covered with long pale fuscous hair ; the mandibles covered with long 

 pale yellow hair, the tips black ; the hind ocelli bordered by a deep furrow behind ; the 

 posterior edge of the head is rounded behind, where it is developed more than the 

 length of the eyes. The antennee are entirely pale yellow ; the scape with long white 

 hair; the flagellum almost bare; the basal joint curved; the third and fourth joints 

 subequal. The thorax is covered all over with long white hair. The mesonotum is 

 strongly punctured; the longitudinal furrows are distinct; the seutellum is more 

 rugose and more closely punctured than the mesonotum, and has the hair longer, the 

 transverse furrow at its base distinct and deep. The median segment has a gradually 



