366 HYMEN OPTEEA. 



branch curved ; the second articulation curved and narrower than the first ; the third 

 articulation still narrower. The mesonotum, and the edge of the pronotum irregularly, 

 red. Wings smoky. 



This is a smaller and narrower species than any of the preceding ; the abdomen is 

 longer and narrower, being distinctly longer than the head and thorax united, and 

 becomes gradually narrower from the second segment. 



ii. Abdomen punctured. (Species 55-68.) 



The group of I. bifoveatus. 



Petiole with the central part narrow, the sides nearly as wide as the central part j 

 raised, depressed at the base and apex ; the depression at the base narrow and deep 

 (the sides broad on either side of it), being clearly separated from the raised central 

 part, the latter finely longitudinally striated. Area on the second segment shield- 

 like at the base, longer than broad, narrowed laterally ; a fine transverse keel 

 at the apex, from which runs a narrow prolongation {also narrowed laterally 

 and with a depression on either side of it), the latter not reaching to the apex of the 

 segment. Lateral depression wide, semioblique, deep in the centre, and impunctate. 

 Suturiform articulation wide, deep, finely striated in the middle ; the basal branch 

 indistinctly indicated ; the apical branch wide, very deep at the base. Abdomen a little 

 longer than the head and thorax united, not much wider than the thorax. Mead 

 narrow, considerably developed and narrowed behind the eyes, the latter oval and 

 reaching nearly to the base of the mandibles. (Species 55.) 

 This group contains a single very distinct species. 



% 55. Iphiaulax bifoveatus. (Tab. xv. fig. 9, $ .) 



Niger, pronoto, mesonoto abdomineque rufis ; alis fuliginosis. $ . 

 Long. 13 millim. ; terebra 9 millim. 



Hab. Mexico, Ventanas 2000 feet (Forrer). 



Antennae stout, microscopically pilose, the joints closely united. Face sparsely covered 

 with long white hairs, rugose ; projecting broadly in front of the eyes, especially near 

 the antennas ; a deep depression between the latter. Front deeply excavated, the 

 excavation divided into two large oval foveas by two keels which come down from the 

 ocelli ; the keels widely separated near the antennas, but becoming closely united towards 

 the centre. Ocelli placed on a raised triangle, surrounded by a shallow furrow. Eyes 

 large, oblong, projecting. Thorax elongated, flat above ; mesonotum without sutures ; 

 pronotum in the middle divided into two by a deep furrow. Scutellum flat, narrowed 

 posteriorly. Metathorax elongated, having a gradual slope to the apex ; the oblique 

 lateral furrow deep and wide. Petiole longer than the second segment ; a deep and 



