334 HYMENOPTEEA. 



The group of I. bros. 

 The keel on the second segment triangular at the base, produced as a sharp keel to near 

 the apex and bordered by a not very deep or wide furrow ; the lateral furrow wide, 

 oblique at the base. Apical branch of the suturiform articulation short, oblique. 

 Body rufous, the head and the apex of the abdomen black; wings yellowish, 

 banded with fuscous, the stigma yellow or black. (Species 8-14.) 



The species of this section differ chiefly from I. sciarius in the structure of the 

 basal segments of the abdomen and in the abdomen being shorter and broader. 



A. Suturiform articulation smooth, not striated. Legs for the greater part black. 



(Species 8—11.) 



a. Stigma yellow. (Species 8-10.) 



1 (2) . Metathorax yellow eros. 



2 (1). Metathorax black. 



3 (4) . A small raised space in the centre of the suturiform articulation ; 



knees broadly yellow trochanter atm. 



4 (3). No raised space in the suturiform articulation ; knees black . . . beatus. 



i.8. Iphiaulax eros. (Tab. XIII. fig. 25, $ .) 

 s ; antennis, capite, abdominis apice pedibusque, nigris ; alis flavis, medio apiceque fumatis. $ . 

 Long. 12 millim. ; terebra fere 9 millim. 



Eab. Guatemala, San Juan in Vera Paz (Champion). 



Antennae stout, very slightly compressed ; the third joint scarcely one fourth longer 

 than the succeeding one. Face finely punctured, semi-opaque ; apex of the clypeus 

 curved, not projecting much. Middle lobe of the mesonotum clearly separated from 

 the lateral lobe ; the furrows distinct, especially in front ; the longitudinal depression 

 on the mesopleurse wide, deep ; the oblique suture on the metapleurse shallower. The 

 centre of the petiole raised, surrounded laterally by a wide and deep depression ; the 

 depression bounded externally by a sharp keel, which is separated from the external 

 outer side by a furrow ; in the centre of the raised central part is a shallow longitudinal 

 furrow. The rest of the abdomen is broader than the mesothorax, and becomes 

 gradually (but not acutely) narrowed towards the apex ; on the basal half of the second 

 and third segments, in the middle, is a carina, broad at the base, narrowed towards the 

 apex ; on both of these segments a deep furrow runs from near the middle obliquely to 

 the sides, down which they run to near the apex, that on the second segment being 

 broader and deeper than the one on the third, which is very narrow (but still deep) 

 down the side ; the raised keel on the apex of the third segment is very distinct, and 

 there is a transverse furrow at the base of the fourth. The cloud in the centre of the 

 fore wing reaches to the base of the stigma, and touches the first transverse cubital 



