360 HYMENOPTEKA. 



on a level, wide, moderately deep. A sharp keel down three fourths of the second 

 segment ; a narrow depression on either side of it, joined at the base to a much wider 

 depression, the latter extending from the side ; first transverse furrow wide and mode- 

 rately deep in the centre, the lateral branches narrower ; the basal fork straight, the 

 apical one curved ; second transverse furrow deep, straight, the third nearly obsolete. 



This is a somewhat larger and stouter species than /. abjectus ; the abdomen is longer 

 compared to the thorax ; the antennae are somewhat longer and stouter ; the hair on 

 the metathorax is much denser and longer ; and the black colour of the metathorax 

 does not run into reddish as in I. abjectus. The head is not striated or wrinkled in any 

 way, and the suturiform articulation is not so strongly striated. 



45. Iphiaulax bilimeki. 



''Niger, abdomine rufo ; alis fuscis. $ • 

 Long. 8-5 millim. ; terebra fere 4 millim. 



Hab. Mexico, Orizaba (Bilimek). 



Antennae a little longer than the body ; basal joint longer than the third, becoming 

 gradually thicker towards the apex, the latter oblique. Head below the antennae 

 densely covered with long white hair ; face nearly transverse ; front but very slightly 

 depressed in the centre ; ocelli scarcely raised ; the furrow leading down from the latter 

 narrow, shallow. Abdomen not much longer than the thorax* wider than the meso- 

 thorax, and becoming narrower from the middle towards the apex. Petiole deeply 

 excavated at the base; the central part nearly triangular (the narrow end at the base); 

 the inner furrow wide and shallow, and bearing a few oblique striations, the outer furrow 

 narrower and deeper. In the centre of the second segment is a stout keel (the broad 

 basal part of which is triangular), occupying three fourths of the segment ; the furrows 

 bounding the keel shallow, the lateral depressions oblique and becoming wider towards 

 the apex. Suturiform articulation wide, longitudinally striated in the middle ; the basal 

 branch narrower and deeper than the apical one; the second articulation not much 

 more than half the length of the first, irregularly striated. Wings dark fuscous, 

 darkest at the base ; the second cubital cellule much shorter than the third. 



E£fu 



2. Suturiform articulation not crenulated or striated. (Species 46-49.) 



46. Iphiaulax salvini. (Tab. XIV. fig. 21, $ .) 



fus ; antennis, capite, pleuris, sterno, mesonoti lateribus pedibusque, nigris ; terebra quam corpus longiore j 

 alis fuscis. $ . 

 Long. 12 millim. ; terebra 11 millim. 



Hab. Guatemala, Cubilguitz in Vera Paz {Champion), 



Antennae stout, almost bare ; the joints somewhat oblique at the apex ; third joint a 

 little longer than the fourth, the basal one nearly as long as the third and fourth 

 together. Head densely covered with rather long white hair; the face opaque, 



