374 HYMENOPTERA. 



The group of I. avakus. 



The abdomen closely but not very coarsely punctured; broader than the thorax, not 

 tapering much towards the apex; shorter than the head and thorax united. 

 Ovipositor shorter, or at least not much longer than the abdomen. Legs black; 

 head and thorax more or less black. (Species 65-68.) 



The absence of a keel or area on the second segment distinguishes this group. 



1 (2) . Head and thorax entirely Hack, except the orbits, the edge of the 



pronotum narrowly, and two lines on the mesonotum, which are 



red avarus. 



2 (1). Head and thorax for the greater part rufous. 



3 (4). Front striated ; stigma and nervures fuscous ; thorax on the under- 



side, and the metanotum in part, black mexicanus. 



4 (3). Front not striated; thorax beneath for the greater part, or entirely, 



rufous ; stigma black ; head mostly rufous. 



5 (6) . Hind coxae entirely rufous ; mesosternum without black .... bellicosus. 



6 (5). Hind coxse black, except at the extreme base; mesosternum broadly 



lined with black jucundus. 



r 65. Iphiaulax avarus. (Tab. XV. fig. 11, $ .) 



Niger, linea pronoti, lineis 2 mesonoti orbitisque oculorum sordide runs ; abdomine flavo-testaceo j alis 



fumatis, stigmate nigro. 5 • 

 Long. 6 millim. ; terebra 1*5 millim. 



Hab. Mexico, Northern Sonora (Morrison). 



Antenna? moderately stout, covered with microscopic pile ; the third joint distinctly 

 longer than the fourth ; the basal joint nearly as long as the third, oblique at the 

 apex. Face densely covered with long glistening white hair, punctured ; the clypeus 

 not projecting at the apex, and not separated by a furrow ; front depressed in the 

 middle ; the latter, as well as the vertex, aciculated, opaque. Thorax shining, impunc- 

 tate; the breast, pleura?, and metanotum densely covered with long white hair. 

 Petiole semiperpendicular, excavated at the base ; the sides separated from the central 

 part by deep and wide furrows. The abdomen not much longer than the thorax, 

 ovate, the segments longitudinally striated. Suturiform articulation wide, deep, also 

 longitudinally striated. 



66. Iphiaulax mexicanus. 



Niger, orbitis, linea pronoti, lineis 2 mesonoti, striga metanoti abdomineque flavo-testaceis ; alis fusco- 



byalinis, stigmate fusco. $> . 

 Long. 8 millim. ; terebra 2 millim. 



Hab. Mexico, Northern Sonora (Morrison). 



