IPHIAULAX. 367 



narrow furrow at the base, the sides on either side of the furrow finely obliquely striated ; 

 the central area raised, widened a little towards the apex ; inner lateral furrow shallow, 

 with three stout transverse keels in the centre ; the outer furrow narrowed, and with 

 some stout keels at the base ; the space between the furrows flat, broad at the base, 

 becoming narrowed gradually towards the apex ; the central part finely longitudinally 

 striated ; the lateral part somewhat obliquely striated, except at the apex. Second 

 segment with the area at the base shield-shaped and longer than broad, the sides 

 retreating ; at the apex of the area are two oval depressions, which are longer than 

 broad, with the base acute and the apex more rounded ; the lateral depression is wide 

 and deep, and has a longitudinal keel at the apex ; the central part bearing a few 

 shallow punctures. Suturiform articulation wide and deep, striated in the centre. The 

 furrow on the third segment deep, striated; in front of it the segment is coarsely 

 rugosely punctured, except at the apex. The fourth segment bears some large shallow 

 punctures ; the fifth segment has but very few punctures. 



The group of I. molestus. 



The area on the second segment twice as broad as long, a broad depression on either 

 side of it ; the base of the segment on either side of the central area raised, 

 and then depressed in front of the raised part ; from the latter, from either 

 side of the area, run stout keels ; the segment itself more or less covered with small 

 shallow punctures. Eyes not or scarcely reaching to the base of the oral circle. 

 (Species 56-58.) 



1 (4) . Abdomen punctured throughout, 



2 (3) . Abdomen broadly black at the apex ; lower half of the stigma and 



the nervures at the apex fuscous molestus. 



3(2). Abdomen entirely rufous ; stigma and nervures entirely black . . pilosellus. 

 4(1). The basal one or two segments only punctured triangulator. 



J^m. Iphiaulax molestus. (Tab. xiv. fig. 22, $ .) 



Niger, abdominis segmentis l°-3 m rufis ; alis fuliginosis, basi fuscis. $ . 

 Long. 11 millim. ; terebra 7 miliim. 



Hab. Guatemala, Capetillo [Champion). 



Antennae longer than the body, tapering towards the apex, stout; basal joint nearly 

 as long as the third and fourth joints (which are subequal) united, becoming gradually 

 thickened towards the apex, the latter transverse. Head covered with long white 

 hair; the face somewhat projecting in the middle; the clypeus not projecting at the 

 apex ; the front depressed in the middle, the longitudinal furrow rather wide ; ocelli 

 but slightly raised. Abdomen longer than the head and thorax united, wider than the 

 mesothorax in the middle, becoming narrowed from the third segment. Petiole a little 



