IPHIAIJLAX. 351 



sharply posteriorly. Sides of the thorax sparsely covered with long white hair ; meso - 

 notal sutures moderately well denned ; the metathorax with a gradual slope to the apex. 

 Abdomen as long as the head and thorax united ; a little wider than the mesothorax ; 

 becoming a little dilated to the end of the third segment, then gradually narrowed to 

 the apex ; the petiole semiobliquely raised from the base. Petiole excavated at the 

 base, the central part raised, roundly contracted at the apex ; a furrow in its centre at 

 the base ; the inner furrow wide and deep and commencing a little in front of the 

 middle, the outer one longer and much narrower. Second segment with the basal 

 part of the central keel broader than long and sharply narrowed towards the apex ; 

 the keel proper narrow and not reaching quite to the apex, and with a narrow,, 

 not very clearly denned, furrow on either side ; the lateral furrow oblique, wide, and' 

 deep. Suturiform articulation wide, not very deep ; indistinctly crenulated ; the basal 

 branch straight, oblique, the apical branch curved. The furrow on the third segment 

 is narrow and not very deep. Wings longish, light fuscous ; the nervures and stigma 

 blackish-fuscous ; the second cubital cellule long, narrow, nearly as long as the third, 

 and of almost equal width throughout. 



B. A stout longitudinal keel on the side of the second segment, dividing the oblique depres- 

 sion in two ; the second segment not striated, impunctate, the second furrow 

 narrow, shallow, impunctate ; thorax flat, much narrower than the abdomen ; wings 

 almost hyaline, the apex darker. (Species 33.) 



V 33. Iphiaulax canescens. 



/Th 



Thorace luteus; abdomine tesfcaceo, antennis, capite pedibusque, nigris ; alis longis,.fumatis, apice fere fusco, 

 / stigmate nigro. $ . 



Long. 10 millim. ; terebra 10 millim. 



Hab. Nicaeagua, Chontales (Janson). 



Head sparsely covered with longish white glistening hairs; face opaque, finely 

 striated (so far as can be made out through the hair) ; two deep depressions (longer 

 than broad) above the antennae, separated by a broad keel going down from the ocelli ; 

 a short acute depression below the antenna? ; palpi fuscous. Thorax longish, the sides 

 parallel, not bulging out in the middle, and not much narrowed at the base and apex ; 

 above flat, the metanotum with very slight and gradual slope to the apex ; the pro- 

 sternum and metathorax covered with long white glistening hair ; metapleuree obscurely 

 punctured. Abdomen not much longer, but much wider, than the thorax. Petiole flat 

 in the centre ; a depression on each side at the apex, the centre there raised somewhat, 

 and with a longish oblique depression on each side of the raised part ; the inner keel of 

 the inner groove acute, very broad and deep, the outer keel obliterated. Down the 

 centre of the second segment is a distinct keel, dilated at the base ; there is an oblique 

 depression on each side of it, bounded by an acute keel ; on the outer side of this is a 



