IPHIAULAX. 361 



obscurely punctured ; vertex shining ; front scarcely depressed above the antennae, the 

 central furrow wide and deep. Thorax shining, impunctate. Abdomen more than one 

 half longer, and scarcely broader, than the thorax ; the segments deeply incised at the 

 base. Petiole gradually sloping to the apex and not subvertical ; the central tongue- 

 shaped area shining ; the inner furrow wide and deep, obscurely striated ; the outer 

 keel stout. Second segment with a stout keel down the centre reaching to beyond the 

 middle ; on either side of the keel deeply depressed, the depression becoming widened 

 at the base and there continuous with another large, deep, oblique one ; the trans- 

 verse furrow wide, deep, bifurcating a little beyond the centre. The edge of the 

 pronotum, the mesonotum (except at the tegulse), the scutellum (except narrowly 

 behind), and the metanotum broadly at the base, red. Wings smoky; the stigma 

 fuscous on the lower side. 



The long and comparatively narrow abdomen with rather flat petiole distinguishes 

 this species from its allies. The hair is sparse but somewhat long. 



47. Iphiaulax infirnms. 



Niger, mesonoto abdominisque segmentis l°-6 m ferrugineia ; alis fumatis. J . 

 Long. 7*5 millim. 



Hab. Mexico (BilimeJc). 



Head covered with long white hair, obscurely punctured ; apex of the clypeus scarcely 

 projecting; front but very slightly depressed; a deep crescent-shaped fovea in front of 

 the ocelli. Abdomen longer than the head and thorax united, but scarcely so wide as 

 the mesothorax. Petiole with the central part pear-shaped ; the inner furrow wide and 

 deep and separated from the outer one by a stout keel. Second segment with a stout 

 keel running down the basal half, the keel not bordered by a distinct furrow; the 

 lateral depression wide and deep, reaching beyond the middle. The suturiform articu- 

 lation of moderate width and bifurcating quite close to the middle ; the basal branch 

 not much narrower than the apical one ; the second and third articulations not much 

 narrower than the first. The mesonotum is red in front of the scutellum, except a 

 large black mark on each side in front of the tegulae ; the extreme apex of the abdomen 

 black ; the pilosity of the latter is rather sparse. The stigma on the lower side and 

 the nervures towards the apex are fuscous. 



Xa&. Iphiaulax fuscipalpis. 



]tfiger, mesonoto, linea pronoti, abdomineque ferrugineis ; alis fumatis. 3 . 

 Long. 8-5 millim. 



Hab. Guatemala, Capetillo {Champion). 



Antennee as long as the body, stout, scarcely tapering towards the apex ; microsco- 

 pically pilose ; basal joint stout, not much shorter than the following three joints 

 united. Face covered with long white hair, transverse, rugose ; clypeus scarcely pro- 



biol. CENTE.-AMEE., Hymenopt, February 1887. 3 aa 



