IPHIAULAX. 359 



the longest and curved ; the keel scarcely striated ; the two hinder transverse furrows 

 narrow and moderately deep. The apical segment deeply and widely depressed 

 (perhaps accidentally) in the centre above. Wings very large, deep fuscous-black ; the 

 recurrent nervure interstitial ; cubital cellules large and wide, the second much shorter 

 than the third and with its upper and lower sides of nearly equal width at the apex. 



This is the largest species in the section ; it will readily be known from its allies by 

 the characters given in the synoptical table, and also by the much darker and larger 



wings. 



x 



43. Iphiaulax abjectus. 



/ Niger, pronoto, mesonoto, scutello abdomineque runs ; facie striata ; artieulatione suturiformi lateribus striolata ; 

 alis fuscis. $ . 

 Long. 8 millim. ; terebra fere 10 millim. 



Hob. Mexico, Presidio (Forrer). 



Antennae stout, not much longer than the thorax and abdomen united ; basal joint 

 longer than the third and fourth joints together, its apex transverse. Face transverse, 

 rugose, sparsely pilose ; apex of the clypeus not projecting ; front but very slightly 

 depressed in the middle, rugose, the furrow narrow and of equal width ; vertex shining, 

 impunctate. Abdomen about as long as the head and thorax united. Petiole semi- 

 perpendicular ; the central part pear-shaped (the narrow end at the base) ; the inner 

 furrow broad, straight, moderately deep, and bounded on the outer side by a sharp 

 keel, the outer furrow narrower. Second segment with a sharp keel reaching to a 

 little beyond the middle, and issuing from a broad base ; a narrow furrow on either side 

 of the keel curving round at the base into the oblique lateral depression, the latter 

 being of moderate width. Suturiform articulation narrow, moderately deep, the basal 

 branch half the size of, and shallower than, the apical branch ; the second articulation 

 narrower, situated quite close to the base of the segment. 



44. Iphiaulax vagabundus. (Tab. XIV. %. 20, $ .) 



Niger, medio mesonoti, scutello, pronoto abdomineque rufo; facie lsevi; artieulatione suturiformi lateribus 



non striata ; terebra quam corpus longiore ; alis fuscis. $ . 

 Long. 10 millim. ; terebra 12 millim. 



Hab. Mexico, Presidio [Forrer). 



Antennae as long as the body, moderately stout, tapering towards the apex, the third 

 joint a little longer than the fourth; covered with a pale microscopic pile. Head and 

 palpi covered with a glistening white, rather long pubescence; face semiopaque, 

 obscurely punctured; front depressed above the antennae (but not deeply), finely 

 rugose, opaque, the central furrow deep; tips of the mandibles piceous. Thorax 

 impunctate, shining ; sternum, pleurae, and metathorax covered with long white hair. 

 Petiole with the tongue-shaped central portion shining, impunctate ; the two furrows 



