386 HYMENOPTERA. 



nervures pallid testaceous, the stigma with a more fulvous tint. The radial cellule is 

 longer than the stigma ; the basal abscissa of the radius is short and oblique, the 

 apical abscissa longer and curved ; the first transverse cubital nervure is strongly, the 

 second very slightly oblique; the third transverse cubital and the second recurrent 

 nervures are entirely obliterated ; the first recurrent nervure is received in the basal 

 third of the cellule. 



In having the abdomen belted with black this species resembles S. aretes; but that 

 insect has the petiole (and especially the narrowed basal part) longer and towards the 

 apex much more strongly punctured. S. aretes also agrees with S. nigrobalteata in 

 having the median segment reticulated, but the base in the centre is reticulated like 

 the rest of the segment, there being no keels with the intervening spaces impunctate; 

 the metapleurae are entirely punctured, and the third antennal joint is much longer in 

 proportion to the fourth. 



141. SphaBrophthalma aretes, 



Ferruginea, antennis pedibusque pallide flavis; abdominis segmento 3° nigro balteato; alis hyalinis, apice 



levissime fumato, nervis pallide flavis, stigmate flavo. <$ . 

 Long. 7 millim. 



Hob. Mexico, Northern Sonora {Morrison). 



The head is nearly as wide as the thorax, impunctate, sparsely covered with long 

 white hair; the mandibles yellowish, the tips ferruginous; behind the eyes the head 

 is much narrowed and rounded, and is developed there nearly the length of the eyes. 

 The antennae are a little longer than the head and thorax united, not tapering much, if 

 at all, towards the apex, uniformly pale yellow, clothed with a white microscopic down ; 

 the third joint is perceptibly longer than the fourth. The thorax is of a deeper 

 ferruginous tinge than the head, and is sparsely covered with long pale fuscous hair; 

 the mesonotum is indistinctly punctured ; the median segment is reticulated and has a 

 gradually rounded slope ; the pro- and mesopleurae are punctured, the metapleurae 

 reticulated. The petiole is nearly as long as the second abdominal segment and 

 becomes gradually thickened towards the apex; it is keeled laterally, coarsely punc- 

 tured, and covered with long white hair. The second segment is punctured somewhat 

 strongly; the other segments are impunctate; the third segment has a broad black 

 band in the middle ; the apical segment is paler and without keels. The third and 

 fourth ventral segments are for the greater part black. The hinder femora are for the 

 greater part black. The wings nearly reach the apex of the abdomen ; the radial 

 cellule is a little shorter than the stigma, and commences a little beyond its base ; the 

 radial nervure at the base and apex is straight ; at the base the second cubital cellule 

 is not half the width it is at the apex; the first recurrent nervure is received shortly 

 before the first transverse cubital ; the second recurrent and the third transverse cubital 

 nervures are completely obliterated. 



