50 



tibiae to shortly boyond the middle wliitish, the rest of it and the hind 

 tarsi fuscous. The antennae from the sixth joint fuscous, darker towards 

 the apex. Wings hyaline, the nervuros and stigma fuscous. Female. Length 

 4 mm. Chinandega, Nicaragua. 



Head and thorax shagreened. Parapsidal furrows distinct on the basal 

 half of mesonotum. Metanotum areolated. Basal two segments of abdomen 

 clearly longitudinally striated, the third closely finely rugose; on the 

 base of the second is a clearly defined aiva slightly longer than wide, 

 rounded and slightly narrowed at the apex and pallid yellow in colour, 

 the apex of the third segment margined and broadly rounded, the outer 

 edges projecting. 



1452 Microdus trochanteratus sp. nov. 



Ferruginous, the antennae, a broad line on the fore femora behind, 

 the four posterior trochanters and apices of the four posterior tibiae 

 and the hind tarsi, black. Wings fuscous, the nervures black. Female 

 Length 6 mm., terebra 4 mm. San Marcos, Nicaragua. 



Antennae densely covered with a black microscopic pile. A stout 

 keel occurs in the center of the scutellar depression; the apex of the 

 scutellum is depressed; the apical keel is less stout than the lateral. Meta- 

 notum with six areae, the lateral square, the basal central sharply pointed 

 (lanceolate) at the base, the apical slightly narrowed at the apex, longer 

 than broad. Abdomen as long as the thorax, smooth. Areolet triangular, 

 the nervures almost uniting in front. Wings highly iridescent. 



Kareba gen. nov. 



Three cubital cellules; the recurrent nervure received in the second 

 transverse median in praediscoidal cellule; radius issuing from shortly 

 behind the middle of stigma; radius in hind wing obsolete. Occiput dis- 

 tinctly margined. Parapsidal furrows distinct, the middle lobe of meso- 

 notum depressed at apex. A large not very deep, depression, of uniform 

 width occurs at the base of scutellum, its sides with a round shallow fovea. 

 Metanotum with two keels in the centre, at the base they unite, diverge 

 obliquely to the top of the apical slope, then side. The first abdominal 

 segment is slightly longer than its width at the apex; it and the follo- 

 wing segment closely, strongly, longitudinally striated; the suturiform 

 articulation obsolete, the other segments smooth, the last broadly roun- 

 ded. Calcariae minute. Tarsi shorter than tibiae. Antennal joints elongate. 

 The male I do not know, but the female should readily be separated 

 from Ehyssalus, the only genus with which it could be confounded, by 

 the radius originating behind the middle of the stigma and by the stron- 

 gly striated two basal segments of the abdomen. 



1453 Kareba fiavipes sp. nov. 



Rufous, suffused with black, the median segment and the middle of 

 abdomen almost black, the apical four segments of the abdomen testa- 

 ceous, tinged with yellow; antennae yellow, tinged with fulvous; legs 

 pale yelow; wings hyaline, iridescent, the nervures and stigma pallid 

 testaceous. Female. Length 5 mm., terebra 1 mm. Acapulco, Mexico. 



