xlvii, '36] ENTOMOLOGICAL NEWS 147 Rhectognathus, A New Group in the Lindenius Complex (Hymenoptera: Sphecidae: Crabrcnini) By V. S. L. PATE, Cornell University, Ithaca, New York. There is before me a short series of small Crabronine wasps which represent a new group closely allied to the old world Encopognathus. They are particularly interesting in that they exhibit certain features that parallel in some measure those pos-sessed by the more primitive members of the Oxybelini and while probably not ancestral to this group, nevertheless, offer a suggestion as to what that original and probably now extinct stock may have been like. RHECTOGNATHUS ' new subgentis. Head with mandibles simple and acute apically, strongly ex-cised beneath, internally bidentate on basal half; eyes naked; antennal sockets distant, the distance between them almost twice the distance between them and the nearest eye margin ; antennae of both sexes 12-segmented, the pedicel and the first and second fiagellar segments subequal in length, scapes compressed and evenly, arcuately, inwardly bowed strongly so in the male, weakly in female ; ocelli arranged in a very flat triangle ; maxil-lary palpi 6-segmented, labial 4-segmented. Females with a well developed psammophore. Tlwra.r subtly punctured ; mesopleura rounded anteriorly, not sharply margined (i.e. without an epicnemium), smooth, shin-ing, and finely punctate ; mesepisterna without a precoxal carina before the middle coxae ; suture between the mesonotum and the scutellum simple, not dilated laterally; middle tibiae with one small calcaria apically. Winys with the marginal cell of the fore wing rather long, squarely truncate apically, the transverse cubital vein distinctly ungulate, perpendicular above, sharply inclined basad helmv <<> cuhitus, joining the radius about middle of marginal cell, re-current vein joining cubitus about middle and not causing it in be appreciably angled backward; first discoidal cell trapexoidal. Anal lobe of hind wings not longer than the submedian cell. _ Abdomen depressed; first and second segments broadly ses-sile; first and second tergites with a sharp edge laterally" as in I'cloniicnts and somewhat inflexed, remaining tergites inflexed 1 PTT/CTOS, broken + j'Traflos, jaw, in allusion to tin-structure of the mandibles.
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