364 HYMENOPTERA. 



Head sparsely covered with pale hair 'below the antennae; the face opaque, finely 

 rugose, a little projecting in the middle; clypeus slightly projecting at the apex; front 

 rugose, a little depressed in the centre, where there is no distinct furrow; vertex a 

 little opaque, impunctate. Abdomen not much longer than the head and thorax 

 united. Petiole with the central part narrowed a little at the base and apex ; inner 

 furrow wide, irregularly and obscurely rugose, the outer furrow not half its width. Second 

 segment with a sharp area in the centre; the area longer than broad, ending in a. sharp 

 point a little beyond* the middle, and bounded by a narrow furrow which joins the 

 oblique and very much broader lateral furrow at the base ; the lateral furrow not reaching 

 to the apex of the central area. Suturiform articulation of moderate width, the second 

 articulation more curved and narrower ; the striation on the latter and on the furrow 

 on the third segment not very .strong. The apical segments are yellowish at the apex; 

 the pronotum irregularly reddish on the border. Wings dark fuscous, the stigma 

 black. 



In this species the abdomen is shorter than in I. excuratus-, the head more shining 

 and more developed behind ; the extreme upper edge only of the pronotum red ; the 

 wings darker and, if anything, longer ; ancLthe colour of the abdomen brighter. It is 

 otherwise easily separated from that species by the area on the suturiform articulation 

 being blunt at the apex, as well as shorter. 



y 52. Iphiaulax excuratus. (Tab. XV. fig. 6, $ .) 



tfiger, linea pronoti, mesonoto, scutello, striga metanoti abdomineque rufis ; alis fumatis, basi fere byalinis. $> . 

 Long. 8 millim. ; terebra 7 millim. 



Hah. Guatemala, near the city {Champion). 



Antennae a little longer than the body, very slightly attenuated towards the apex, 

 almost bare; basal joint about as long as the third and fourth joints united. Head 

 below the antennae scarcely transverse, obscurely punctured ; front not depressed. 

 Abdomen wider and half as long again as the thorax. Petiole with the central part 

 comparatively narrow, becoming gradually narrowed towards the apex, the latter trans- 

 verse ; the inner furrow moderately wide and deep, separated from the outer one by a 

 stout keel, the outer border of the outer furrow being also stout. Second segment with 

 a triangular keel in the centre, the keel reaching to a little beyond the middle ; the 

 lateral depression shallow, narrow, and scarcely reaching to the middle. Suturiform 

 articulation wide, minutely striated, the lateral branches originating a little beyond the 

 middle ; from the centre runs a triangular raised area, surrounded by a furrow. The 

 second and third articulations are distinct, but narrower than the basal one. The 

 pronotum is almost entirely red ; there is an obscure red mark below the tegulae and 

 below both wings ; the metanotum has a large red mark in the middle. Wings smoky, 

 the basal half much more hyaline than the apical half; stigma black, fuscous on the 

 lower side. 



