368 HYMENOPTEEA. 



longer than broad, the surface a little roughened ; the central part of nearly equal 

 width ; the inner furrow wide and deep, with a few transverse keels, its outer border 

 forming a stout keel ; the outer furrow a little wider, and placed on a lower level than 

 the inner. Second segment with a shining area in the centre at the base ; the area 

 broad at the base, broader than long, and prolonged to the apex as an acute keel ; on 

 either side of this keel, bounded by the base of the segment, is a depression which at 

 the base bears some stout keels ; the apex irregularly punctured. Suturiform articu- 

 lation wide and deep, occupying one third of the segment, and strongly longitudinally 

 striated, the striations being continued on both the lateral branches; the second 

 articulation is not half the width of the first, but is fully as deep. The segments are 

 punctured, the punctures rather shallow and not closely set together. 



A larger and stouter species than /. pilosellus ; the antennae and terebra longer ; the 

 antennal tubercles much more developed ; the wings lighter in tint, and with the 

 lower half of the stigma and the apical part of the nervures fuscous; the abdomen 

 broadly black at the apex ; the inner furrow of the petiole much broader, and with a 

 few stout transverse keels, the outer furrow still broader ; the puncturing on the 

 segments not so strong ; and generally the abdomen not so pilose. 



J\ 57. Iphiaulax pilosellus. (Tab. XV. fig. 7, $ .) 



/"Niger, abdomine rufo ; alis fuseis. $ . 

 Long. 10 millim. ; terebra 4*5 millim. 



Hab. Guatemala, San Geronimo (Champion). 



Antennae as long as the thorax and abdomen united, stout, microscopically pilose, 

 tapering towards the apex ; the joints clearly separated ; the basal joint nearly as long 

 as the third and fourth united, its apex produced on the underside. Head densely 

 covered with long white hair ; the face and cheeks rugose ; the front aciculated, laterally 

 depressed in the middle, the basal half of the furrow double the width of the apical 

 half. Abdomen one half longer than the thorax, covered (much more distinctly on the 

 basal half) with large punctures. Petiole with the central part of nearly equal width ; 

 an obscure keel down the middle ; the inner furrow narrow and bordered by stout keels 

 on both sides, the outer furrow wider at the apex. Second segment with a stout keel, on 

 either side of which is an oblong depression ; the lateral depression oblique, widened 

 at the apex. Suturiform articulation wide, the branches originating not far from the 

 sides ; strongly longitudinally striated ; the second and third furrows near the base of 

 the segment narrower and not so strongly striated. 



58. Iphiaulax triangulator. 



Niger ; abdomine ferrugineo, basi punctato ; alis fuliginosis. $ . 

 Long. 9-5 millim. ; terebra 4 millim. 



Hab. Panama, Volcan de Chiriqui 2000 to 3000 feet (Champion). 



