332 HYMENOPTERA. 



The group of I. lachrymosus. 



The centre of the second abdominal segment raised, but not forming a keel; the lateral 

 furrows oblique, wide, deep ; suturiform articulation sinuated. Inner furrow of 

 the petiole wide, deep, the central part not much narrowed towards the base. Abdo- 

 men a little longer than the head and thorax united ; the apical ventral segment 

 ploughshare-shaped. Ovipositor longer than the body. Eyes oval; face rough, 

 shining. Recurrent nervure not interstitial. Body luteous, the head and the apex 

 of the abdomen black; wings yellowish-hyaline, banded with fuscous. (Species 6.) 



The raised central part of the second segment sufficiently distinguishes this group 

 from the two preceding. The coloration of the body and wings is of the same type, 

 but the species is much smaller in size. 



y^ 6. Iphiaulax lachrymosus. (Tab. XIII. fig. 24, $ .) 



Luteus ; antennis, capite, abdominis apice late pedibusque, nigris ; geniculis, trochanteribus tarsisque anticis 

 luteis ; alis flavo-hyalinis, fuseo bifasciatis, stigmate nigro ; articulations suturiformi sinuata ; terebra 

 quam corpus longiore. $> . 



Long. 9 millim. ; terebra 10 millim. 



Hab. Panama, Bugaba 800 to 1500 feet (Champion). 



Antennae stout, 43-jointed, scarcely so long as the body ; sparsely microscopically 

 pilose. Head shining ; eyes margined ; a rough keel down either side of the face ; the 

 central part uneven ; the keel in the centre of the front wide, moderately deep. Middle 

 lobe of the mesonotum distinct ; scutellum raised, the sides keeled, becoming narrowed 

 towards the apex. The middle cloud in the fore wings extends from a little in front 

 of the transverse basal nervure to the apex of the stigma ; the central cloud is broad ; 

 in the hind wings only the apex is broadly smoky. 



In general coloration and size this species approaches very closely to I. gloriatorius, 

 but the different structure of the second abdominal segment sufficiently distinguishes 

 the two. 



f f A keel on the second segment. (Species 7-54.) 



The group of I. sciaeius. 



The keel on the second segment extending to the apex, becoming gradually narrowed to a 

 point, not dilated at the base, the depression on either side of it very deep and wide ; 

 the lateral furrow also deep and wide, slightly oblique, and not curved, extending 

 to near the apex. The apical fork of the suturiform articulation extending to the 

 apical third of the segment, forming a rounded curve, not reaching to the side. 

 Eyes oval ; head considerably developed behind them. Body luteous, the head, the 

 apex of the abdomen, and the greater part of the legs, black; wings smoky-hyaline, 

 a fascia below the stigma and the apex, fuscous. (Species 7.) 



