IPHIATJLAX. 369 



Antennae stout, not longer than the thorax and abdomen united; basal joint pedun- 

 culated, a little longer than the third and fourth joints together, becoming gradually 

 dilated towards the apex. Head densely covered with white hair ; face transverse, the 

 clypeus not projecting; eyes margined; the front depressed in the middle, its central 

 furrow wide ; ocelli not raised ; mandibles piceous at the apex. Abdomen a little 

 longer than the head and thorax together, wider than the latter. Petiole semiperpen- 

 dicular, the central part rough in texture and of nearly equal width ; the inner and 

 outer furrows crenulated, the inner one wider than the outer. Second segment with a 

 somewhat triangular area ; the area bounded by a wide coarsely striated depression, 

 which is united to the oblique lateral depression without becoming narrower. Suturiform 

 articulation of moderate width, its basal branch narrower than the apical one; the 

 second articulation narrow, and placed a little before the middle of the segment; 

 the third articulation a little narrower, placed near the base of the segment, and 

 smooth, not obscurely striated like the second. The abdomen is entirely red, except 

 the extreme apex. Wings large, dark fuscous ; stigma and nervures fuscous ; the 

 cubital nervure straight, scarcely bent at the base. The apical two joints of the palpi 

 are fuscous. 



Most nearly allied to /. pilosellus, but narrower and not so pilose (especially on the 

 head and metathorax) ; the abdomen, from the third segment, bears no punctures, and 

 is much more shining. 



The group of I. lacteifasciatus. 



Second segment with a triangular area, the area a little longer than wide, the hollow on 

 either side of it crenulated ; the lateral furrow oblique, not striated ; the base not 

 raised ; somewhat strongly punctured. Eyes not reaching to the base of the oral 

 region. Wings more or less marked with hyaline spots. Antennae longer than the 

 body, filiform. (Species 59 & 60.) 



The area longer than broad, the wings not uniformly fuscous, and the much longer 

 and thinner antennae separate this section from /. molestus and its allies. 



1 (2) . Abdominal segments uniformly punctured ; the third and following 



segments black at the apex, the others dull red ; wings black at 

 the base, lacteous at the apex, the stigma entirely black ; thorax 

 but slightly hairy, the hairs black lacteifasctatus. 



2 (1). Abdominal segments not uniformly punctured; only the apical 



segments black, the others bright red ; wings black at the base, 

 the first cubital cellule subhyaline, the stigma ochraceous ; thorax 

 densely pilose, the hairs white divinator. 



biol. cente.-amee., Hymenopt, February 1887. 3 bb 



