IPHTAULAX. 373 



wide, especially at the apex ; the keel stout, acute. Second segment with the area 

 broader than long ; the area smooth and shining, acute at the apex, the keel reaching 

 nearly to the suturiform articulation ; strongly rugosely (more strongly than the third 

 and fourth segments) punctured. Suturiform articulation wide, deep, coarsely striated ; 

 the furrow on the third and fourth segments not quite so wide and deep, rugose. The 

 apical segments not strongly punctured ; the sixth segment largely red laterally. 



The group of I. sonokensis. 



The abdominal segments in the middle or at the apex broadly depressed and striated, 

 the rest shining and impunctate ; the area on the second segment broader than 

 long, shining, impunctate ; the lateral area oblique, very wide, shining, indistinctly 

 striated. Abdomen longer than the head and thorax (nearly double the length of 

 the thorax) united; becoming gradually broader to the fourth segment, but not 

 broader than the thorax; vermilion-red, the edge of the pronotum, and the mesonotum 

 in front, red. (Species 64.) 



This group is readily distinguished by the very wide and deep striolated furrows on 

 the abdomen, the latter longer than the head and thorax united ; and also by the long 

 and narrow body. It contains a single species. 



^V 



64. Iphiaulax sonorensis. (Tab. XV. fig. 4, $ .) 



Niger, linea pronoti, macula ad basin mesonoti abdomineque runs ; alis fuliginosis. 2 . 

 Long. 9 millim. ; terebra 7 millim. 



Hab. Mexico, Northern Sonora (Morrison). 



Antennae as long as the body, almost glabrous ; third joint distinctly longer than 

 the fourth ; basal joint not much longer than the third, thick, oblique at the apex. 

 Head below the antennae densely covered with long white hair ; the face nearly trans- 

 verse, finely punctured ; the clypeus very slightly projecting at the apex ; the front 

 scarcely depressed, the central furrow narrow. Pleurae and sides covered with long 

 white hair. Abdomen much longer than the head and thorax together, towards the 

 middle a little wider than the mesothorax. Petiole raised in the centre at the apex, the 

 base deeply and broadly depressed ; the central part keeled in the middle ; the inner 

 furrow moderately wide and deep and curved, the outer furrow narrower. Second 

 segment with a keel running down the centre to a little beyond the middle, the keel 

 starting from a somewhat triangular area ; on either side of the keel deeply depressed 

 (especially near the side) and irregularly and strongly striated. Suturiform articulation 

 very wide, occupying more than half the segment ; its centre broadly raised in the 

 middle ; the apical branch much wider than the basal one and finely striated. 



