1913- ] W. M. Wheeler : Hymenoptera, II. 235 



Head large, subrectangular, distinctly longer than broad, 

 very slightly narrower in front than behind, with straight sides, 

 broadly rounded posterior corners and the posterior margin 

 distinctly but not deeply emarginate. Upper and lower surfaces 

 convex. Median longitudinal furrow extending the full length of 

 the head but shallow. Eyes small, rather convex, but consisting 

 of numerous facets, situated near the anterior third of the head. 

 Median ocellus present in some individuals. Mandibles with 

 5 subequal teeth, moderately convex, with rather straight external 

 borders. Clypeus short, flattened in the middle, its anterior border 

 broadly rounded, feebly and sinuately excised in the middle. 

 Antennae short, rather slender; scapes reaching to about ^ the 

 distance between the eyes and the posterior corners of the head ; 

 basal joint of the two-jointed club scarcely half as long as the 

 apical; first funicular joint as long as joints 2-4 together ; joints 

 2-8 scarcely longer than broad. Frontal carinse short and diverg- 

 ing. Frontal area large, flat. Thorax shorter than and half as 

 broad as the head, broadest through the pronotum, which is 

 broader than long and, when seen in profile, very convex and 

 rounded above, with rounded humeri. Mesonotum small, trans- 

 versely concave in the middle, separated from the pronotum by a 

 distinct suture and ridge, its general outline in profile rapidly 

 sloping to the epinotum from which it is separated by a deep 

 suture. Epinotum much lower than the pronotum, about as long 

 as high, in profile with subequal base and declivity, the former 

 horizontal, the latter sloping, armed with two small acute up- 

 wardly directed teeth, which are as long as broad at their bases. 

 These bases are prolonged anteriorly and posteriorly on each side 

 into a ridge along the base and declivity of the epinotum. The 

 space between these ridges is slightly concave. Petiole slender, 

 longer than high through the node, which has a long, concave 

 anterior and flat posterior surface, with the summit rounded in 

 profile and transverse when seen from above. Lower surface of 

 petiole without a tooth. Postpetiole small, rounded, transversely 

 elliptical ; a little broader than long and a little broader than the 

 petiole. G aster large, ovate, narrowly emarginate at the insertion 

 of the postpetiole. Sting well-developed. 



Mandibles, clypeus and frontal area shining, the mandibles 

 coarsely and sparsely punctate, longitudinally rugose at their 

 bases Clypeus and cheeks finely and regularly longitudinally 

 rugose. Remainder of head opaque, more coarsely rugose, the 

 rugse on the front diverging backwards and covering a fan-shaped 

 area, those on the posterior fourth of the head transverse but not 

 coarser than the frontal rugie, and those on the sides longitudinal. 

 Thorax, petiole and postpetiole opaque, pro- and mesonotum 

 transversely and rather irregularly rugulos:? ; epinotum and base 

 of petiole reticulately, upper surfaces of petiolar and post- 

 petiolar nodes irregularly rugulose. Gaster subopaque or slightly 

 shining above and, especially at the base, finely reticulate and 

 sparsely punctate; base of first segment also with traces of 



