IPHIAULAX. 339 



The group of I. championi. 



The keel on the second segment broad at the base (not dilated), becoming gradually 

 narrowed towards the apex of the segment, which it reaches; the bordering 

 depressions deep, moderately wide ; the lateral furrow narrow, bordered by a 

 sharp Jceel on the inner side. A keel on the third segment (broad and triangularly 

 dilated at the base, narrowed towards the apex), the bordering depression wide, 

 shallow. Apical branch of the suturiform articulation curved, longer than the 

 basal. Thorax flat above ; the apex of the petiole raised above it. Abdomen a 

 little longer than the head and thorax united, becoming dilated to the apex of the 

 third segment. The second cubital cellule shorter than the third, wide ; the cubital 

 nervure rounded upwards at the base. Luteous; the head, legs, andprosternum black; 

 wings with the apex and a fascia below the stigma smoky. (Species 15 & 16.) 



A 



The keel on the third segment makes this a very distinct group. 



15. Iphiaulax championi. (Tab. XIV. fig. 4, § .) 



Luteus ; antennis, capite, prosterno pedibusque, nigris ; genieulis tarsisque anterioribus testaceis ; alis flavo- 



hyalinis, fascia medio apiceque fumatis, stigmate nigro. $ . 

 Long. 12 millim. ; terebra 11 millim. 



Hab. Panama, Bugaba (Champion). 



Antennae scarcely so long as the body ; the third joint longer than the fourth, curved 

 laterally, and dilated at the base. Head broader than long in front, the face punctured ; 

 clypeus transverse at the apex, not gaping much; a furrow between the antennal 

 tubercles ; front depressed above the antennae ; a thin carina running down from the 

 ocelli, which are surrounded by a furrow. Thorax narrow, longish, flat on the upper 

 side, the metanotum not being much depressed below the mesonotum, from which it 

 gradually recedes. Scutellum perfectly flat, not raised above either the meso- or meta- 

 notum, and bearing some punctures. Pleurae somewhat compressed. Petiole with a 

 somewhat pear-shaped (the base, however, is too transverse) area, bounded by a wide 

 and deep depression, except at the base, where the depression is scarcely noticeable ; 

 the narrow apex of this depression becoming confluent with the raised apical portion ; 

 along the side of the latter is a keel, with a furrow on its outer side. In the centre of 

 the second segment is a heart-shaped depression, enclosing a somewhat triangular raised 

 part in the centre ; along the side is a furrow, curved at the base. In the centre of the 

 third segment is a triangular carina (broadest at the base), and from the base a broad 

 oblique furrow runs to each side; at the base of this segment is a semicircular 

 or curved furrow, irregularly reticulated. In the centre of the fourth segment is a large 

 depression, with a stout keel in the middle ; a smaller depression also on the fifth, but 



2 xx 2 



