SPH^KQPHTHALMA. 377 



are hyaline, with a faint fuscous tinge ; the stigma is deep black ; the radial cellule is 

 hardly so long as the first and second cubital cellules united, the radius roundly curved 

 at its apex ; the first cubital cellule is sharply angled at the base ; the first recurrent 

 nervure is received not far from the middle of the cellule ; the third transverse cubital 

 nervure is almost obliterated, being very faint, beneath it is narrowed and bluntly 

 angled in the middle. 



133. SphaBrophthalma dioetus. 



Long. 10 millim. $ . 



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



Almost identical in coloration with S. ceax, but differing from it in the abdomen 

 being much less pilose, the second segment almost glabrous (whereas in S. ceax it is 

 covered all over with long pale hair) ; the petiole a little longer compared with the 

 second segment and not so stout towards the apex ; the wings shorter compared with the 

 body ; the reticulation on the median segment more distinct, the segment itself with 

 a somewhat more gradually rounded slope. 



The head is not much narrower than the thorax and is abruptly contracted behind 

 the eyes ; smooth, shining, very indistinctly and finely punctured, and not very thickly 

 covered with long fuscous hair. The pit in front of the ocelli is deep, moderately wide, 

 and curved. The mandibles are entirely ferruginous, punctured at the base, and 

 covered with long white hair. The antennas are stout, black, except the basal two 

 joints, which are ferruginous; the scape is sparsely covered with pale fuscous hair; 

 the fiagellum is closely covered with white pubescence ; the third joint is at least one- 

 quarter longer than the fourth. The thorax is shorter than the abdomen and thicker 

 than it ; the mesothorax is covered with long fuscous, the metathorax with long white 

 hair ; the hair on the prothorax being also long, soft, and white. The punctuation on 

 the prothorax is fine and close, on the mesonotum it is much coarser ; the median 

 segment has a gradually rounded slope and is reticulated all over. The mesopleura? 

 are punctured ; the metapleurse, except at the base, are reticulated. The petiole is 

 gradually dilated towards the apex, and is not much shorter than the second segment ; 

 it is rather strongly punctured and covered with long white hair. The other abdo- 

 minal segments are all deep black, smooth, shining, and impunctate, and fringed at 

 the apices with long soft white hair. The legs are black, the coxae and trochanters 

 ferruginous, the calcaria fuscous ; they are covered all over with long white hair, that 

 on the femora being longer and sparser. The wings are almost hyaline, the nervures 

 fuscous, the stigma nearly black ; the radial cellule is as long as the first and second 

 cubital cellules united ; the radial nervure is curved at the base and apex ; the first 

 transverse cubital nervure is oblique, the second somewhat roundly curved at the top, 

 the third obliterated or but very faintly indicated ; the cubital nervure is obliterated 

 biol. cente.-amer., Hymenopt., Vol. II., May 1896. 3 cc 



