IPHIAULAX. 363 



becoming gradually narrowed to the apex, sufficiently distinguishes this group from the 

 preceding. The species are very uniformly coloured, deep vermilion. 



1 (2). Thorax entirely black cruentatus. 



2 (1). Mesonotum in front of the scutellum red. 



3 (4). Suturiform articulation striated teres. 



4 (3). Suturiform articulation impunctate. 



5 (8) . A raised area in the middle of the second segment at the base ; the inner 



furrow on the petiole crenulated ; metanotum red in the middle. 



6 (7). The basal half of the wings much lighter than the apical half; the area 



on the second segment distinct, acute at the apex, not originating in 



the suturiform articulation excuratus. 



7 (6). The wings uniform in colour; the area on the second segment origi- 



nating in the suturiform articulation and dividing it in two, not 



acute at the apex pugillator. 



8 (5) . No area on the second segment ; metanotum entirely black .... paganus. 



/^50. Iphiaulax cruentatus. (Tab. XV. fig. 3, $ .) 



/Niger, abdomine ferrugineo ; terebra quam abdomen breviore ; alis fuscis. $ 

 Long. 9 millim. ; terebra 4*5 millim. 



Hab. Costa Kica, Cache {Rogers). 



Antennae nearly as long as the body, scarcely tapering towards the apex ; covered 

 with pale microscopic pile ; basal joint as long as the second and third joints united, 

 slightly dilated towards the apex, shortly pedunculated. Head densely covered with 

 rather long grey hair ; front but very slightly depressed, and with a narrow keel in the 

 middle ; face almost transverse ; clypeus not projecting, not separated from the face. 

 Pleurae and metanotum covered with long white hair. Abdomen longer than the head 

 and thorax united, a little broader in the middle than the mesothorax. Petiole shining, 

 the central part becoming gradually broader towards the apex ; the hinder furrows wide 

 and deep. Second segment with the wedge-shaped area reaching nearly to the apex, 

 the furrows bounding it irregular ; the lateral depression wide and deep, not reaching 

 to the apex of the central area. Suturiform articulation not very wide ; the striations 

 moderately strong in the middle, but becoming weaker towards the sides. The suture 

 on the fourth segment a little narrower, and with the striation nearly as strong as on the 

 first ; the suture at the base of the fifth segment narrower and not so strongly striated. 

 The colour of the abdomen is a bright vermilion. Wings rather long, narrow ; of a 

 uniform smoky colour throughout, except that the first cubital cellule is more hyaline ; 

 stigma obscure ochreous at the base. 



51. Iphiaulax teres. 



Niger, mesonoto abdomineque ferrugineis ; articulatione suturiformi striolata ; alis fuscis. $ . 

 Long. 8 millim. ; terebra 6 millim. 



Hab. Mexico, Presidio (Former). 



3aa2 



