IPHIATJLAX. 371 



the inner furrow sharply keeled on the outer side, wide, and crenulated, the outer furrow 

 scarcely so wide (except at the apex), but, if anything, deeper. Second segment with 

 a triangular area in the centre, the area surrounded by wide furrows, which are strongly 

 ribbed ; the lateral depression wide and deep. Suturiform articulation wide and deep, 

 the striations strong, the basal branch rather weak ; the second articulation as wide, 

 and, if anything, deeper, the third of much the same width and depth ; the following 

 segments shining and impunctate, their apices raised ; the furrows finely longitudinally 

 striated. The puncturing is strongest on the third and fourth segments ; on the others 

 it is rather weak and irregular. The apical segments are blackish and covered with 

 black hairs. Wings fuscous, subhyaline behind the transverse basal nervure, and also 

 in the first cubital nervure and immediately below it ; the stigma black, the extreme 

 base ochraceous ; the cubital nervure a little curved at the base ; the recurrent nervure 

 scarcely interstitial. Apical joint of the palpi white. 



The group of I. kepentinus. 



The area on the second segment usually closely punctured, its base rounded, its apex trian- 

 gular and running into a heel, the latter reaching nearly to the apex of the segment and 

 without a depression on either side of it; the apical part of the segment rugose or 

 rugosely reticulated ; the lateral furrow broad, oblique, shining, rugosely striated. 

 The entire abdomen closely, rugosely punctured ; the furrows broad, and strongly 

 longitudinally striated. Eyes large, reaching to below the level of the base of the 

 clypeus. (Species 61-63.) 



This group chiefly differs from the preceding in the narrower more triangular area 

 on the second segment, and in the transverse furrows being deeper, wider, and 

 striolated. 



1 (4). The area closely punctured ; thorax entirely, and the palpi, black. 



2 (3) . Petiole coarsely rugosely punctured ; abdomen entirely red, not 



much longer than the head and thorax united repentinus. 



3 (2). Petiole not coarsely punctured, and with two foveas near the apex ; 



abdomen longer than the head and thorax united rixosus. 



4 (1). The area shining, impunctate ; pronotum and the sides of the meso- 



notum red, the palpi white egregius. 



/^>6l. Iphiaulax repentinus. 



Niger, abdomine rufo ; terebra quam corpus breviore ; alis fumato-hyalinis, apice fuscis. $ . 

 Long. 8 milHm. ; terebra 5 millim. 



Hab. Guatemala, San Geronimo (Champion). 



Antennae microscopically pilose, tapering towards the apex ; the basal joint as long 

 as the second and third joints united. Head covered with a silvery-white pile ; face 



3bb2 



