356 HYMENOPTEKA. 



of the thorax, smooth, shining, flat, the apex fully as wide as the base. Petiole deeply 

 excavated on the basal third; the central part raised, and keeled on either side. 

 Second segment with a keel in the centre, the latter doubled at the base, the two 

 branches uniting about the basal fourth ; the lateral depression semi-oblique, deep, 

 narrow, and on the inner side bordered by a stout keel. Suturiform articulation 

 situated at the base of the segment, wide, not very deep, and bearing about a dozen 

 stout keels ; from its middle two wide furrows run obliquely to the sides, where they 

 become transverse and somewhat indistinct ; a little in front of them is a narrow trans- 

 verse furrow. At the base of the fourth segment is a curved transverse furrow, which 

 gives origin near its middle to an oblique (but not so sharply oblique as that on the 

 third) furrow. 



^C 39. Iphiaulax versBpacis. (Tab. XIV. fig. 15, $ .) 



Aiger, maculis 2 mesonoti sordide rufis, abdomine flavo-testaceo ; alis fumatis, stigmate nigro. $ . 

 Long. 13 millim. ; terebra 13 millim. 



Hab. Guatemala, Purula (Champion). 



Antennae slightly longer than the body, tapering a little towards the apex ; the 

 flagellum covered with an ashy microscopic pile ; the scape on the underside with long 

 white hair. Head large; the face projecting in the middle; an oval depression (not 

 very clearly defined) over the clypeus ; the sides and the cheeks sparsely covered with 

 white hair, the latter finely punctured. Antennal tubercles large, the space separating 

 them deep ; a longish depression, separated by a raised part in the centre of which is a 

 fine furrow, over each antenna. Palpi fuscous towards the apex, and covered with 

 white hair. Abdomen a little shorter than the head and thorax united; becoming 

 gradually wider to the apex of the fourth segment, then narrowed again to the apex. 

 Petiole excavated at the base ; the raised central part transverse behind, the middle 

 portion rounded at the apex, the former blistered and bounded by a sharp keel, the 

 inner furrow being obsolete ; the outer furrow placed lower down on the sides, and 

 wide and deep. Second segment with a narrow and sharp keel which reaches nearly to 

 the apex, and has a wide oval depression on either side of it; the lateral furrow 

 oblique, not reaching nearly to the side of the segment, and bounded on the outer 

 side by a sharp keel, beyond which is a narrower furrow ; the extreme edge of the 

 segment has a sharp margin, inside of which is a narrow furrow. Suturiform articula- 

 tion wide, the central part bearing eight stout keels ; basal branch obscurely crenulated, 

 the apical branch narrower, more oblique, and reaching beyond the middle of the 

 segment ; at the apex of the segment is a narrow, shallow, transverse furrow which does 

 not reach the sides. The furrow at the base of the third segment is narrow, and does 

 not reach much beyond the middle ; a similar furrow at the base of the fourth segment. 



