MICEODTJS. 



405 



B. Abdomen with a broad, deep, transverse, smooth depression on the second and third 

 segments; petiole raised in the centre; ovipositor longer than the abdomen. 



1 (4). Body black, reddish at the base of the abdomen. 



2 (3) . Wings uniformly blackish, the apex of the metanotum red, the base of 



the abdomen red above basimacula. 



3 (2). "Wings lacteous at the apex, the thorax entirely black, the base of the 



abdomen not black above simulatrix. 



4(1). Body red albitarsis. 



^-V~8. Microdus basimacula. (Tab. XVI. fig. 19, $ .) 



Niger, abdominis basi late apiceque metanoti runs ; alis fuliginosis. $ . 

 Long. 13 millim. ; terebra fere 14 millim. 



Eab. Mexico [Salle). 



Antenna? somewhat shorter than the body, microscopically pilose, tapering perceptibly 

 towards the apex. Head semiopaque, the face punctured ; frontal depression deep, 

 continuous, extending to the hinder ocelli. Thorax not very shining ; the mesonotum 

 faintly shagreened, its middle lobe raised and clearly separated ; the metanotum irre- 

 gularly rugosely reticulated. Abdomen shining, impunctate. Petiole raised in the 

 centre into a tongue-shaped area, narrow towards the apex ; the sides at the apex 

 excavated ; the sides of the area raised considerably at the base. Second segment with 

 a broad, deep, transverse furrow in the middle at its apex, and the third segment with 

 a similar furrow ; the first and third segments slightly interrupted in the centre. Areolet 

 narrow ; the nervures straight, uniting at the top. 



>"Y*9. Microdus Simulatrix. (Tab. XVI. fig. 14, $ ; Tab. XVII. figg. 2 a, maxilla; 



2 b, labium.) 



Niger, basi abdominis subtus testaceo ; alis Miginosis, apice lacteis. $ . 

 Long. 13 millim. ; terebra 14 millim. 



Eab. Guatemala, near the city (Champion). 



Antennae scarcely so long as the body, densely and shortly pilose, the tips curled. 

 Head shining, covered with a blackish pile ; a long, rather deep, fovea a little below 

 the antennee, and a roundish one on the lower part of the face; a broad and deep 

 excavation above each antenna, and another broad excavation on the vertex on either 

 side of the ocelli. Thorax shining, impunctate, covered with a blackish pubescence ; 

 middle lobe of the mesonotum distinct, the dividing sutures deep, broad, two furrows 

 down its centre; metanotum shining, impunctate, the apex subvertical, a keel at the 

 top, a triangular area (surrounded by a deep and wide furrow, and at the apex by three 

 foveas) in the centre, and a stout keel at the sides; metapleurse covered with shallow 

 punctures, bounded behind by a stout keel, depressed in the centre, with three large 

 fovese at the bottom, and excavated in front (especially above, lower down the depres- 



