390 . HYMENOPTERA. 



especially the tibiae ; the femora and tibiae sparsely covered with long, soft, white hair , 

 the tarsi have the hair thicker, closer, and much shorter ; the tips of the tarsal joints 

 are slightly darkened ; the calcaria are pale. The wings are clear hyaline ; the stigma 

 dark, almost black; the nervures fuscous, the transverse cubital and the recurrent 

 nervures much paler. The radial nervure commences beyond the middle of the stigma, 

 sharply oblique at the base, curved at the apex, and extending to the stigma ; the 

 second cubital cellule is much narrowed at the top, being not wider there than the 

 space bounded by the first transverse cubital and the first recurrent nervures; the third 

 cubital cellule is widened at the apex, the recurrent nervure received shortly before the 

 middle ; the first transverse cubital nervure is roundly curved at the bottom, the second 

 quite straight and slightly oblique, the third a little bent ; the transverse basal nervure 

 is interstitial. 



In the form of the petiole this species agrees with S. laerma ; the latter, however, has 

 the scutellum distinctly narrowed towards the apex, the head more rounded behind, the 

 body not so strongly pilose, and the petiole shorter compared to the second segment. 



I have seen males only of the following three species. They have but two cubital 

 cellules and one recurrent nervure, the third transverse cubital and the second- recurrent 

 nervures being obliterated entirely. The radial cellule is longer than the stigma. The 

 head, thorax, and petiole are ferruginous, the abdomen black, and the body is' covered 

 with long white hair. The petiole is elongate, dilated at the apex. 



The three species may be separated as follows : — 



1 (2). The sternum armed with two stout slightly curved teeth marice. 



2 (1). The sternum without teeth. 



3 (4) . The greater part of the petiole and legs black . . . „ lamyrus. 



4± (3). The petiole entirely and the legs for the greater part ferruginous . . facilis. 



145. SphaBrophthalma mariae. 



Capite, thorace petioleque ferrugineis ; abdomine longe albo-hirto ; alis hyalinis, nervis stigmateque fuscis. J . 

 Long. 12 millim. 



Eab. Mexico, Tres Marias Is. (Forrer). 



The head is narrower than the thorax, rather sharply and obliquely narrowed behind 

 the eyes ; the occiput rounded ; shining, impunctate, sparsely covered with long white 

 hair ; the ocelli in a black spot, indistinctly surrounded by a furrow. The mandibles 

 rufous, the tips black ; the basal part bearing long white hair. The antennae stout, 

 reaching to the apex of the thorax, black, the scape and second joint ferruginous, the 

 basal joint with long white hair; the flagellum black, covered with an indistinct pale 

 pubescence ; the third joint almost twice the length of the fourth. The thorax is 



