2 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 93 



cord these generic rank. In this revision 6 of the 22 previously 

 created generic names that have been employed for components of the 

 complex treated by Aldrich and Webber under Zenillia are retained 

 as valid, and 2 new generic names are proposed. 



This group of genera may be characterized as follows: Eyes pilose; 

 ocellar bristles directed forward; frontal bristles descending more or 

 less down on parafacials, at least to base of third antennal segment, 

 one to three uppermost bristles usually reclinate (pre verticals) ; 

 parafrontals pollinose; vibrissae situated at most slightly above oral 

 margin, vibrissal or facial ridges usually bristly on lowest one-third. 

 sometimes extending approximately halfway or slightly more; para- 

 facials bare, at least on lower half; antennae elongate, reaching at 

 least three-fourths way to oral margin, second antennal segment less 

 than half as long as third segment, third antennal segment more than 

 twice as long as wide; arista longer than third antennal segment 

 and not thickened to near the apex, face receding, proboscis well 

 developed and not elongate; palpi of normal length and shape. 

 Chaetotaxy of thorax well developed; anterior acrostichals distinct, 

 one pair just in front of the suture; pteropleural bristle of normal 

 length or weak; posterior sublateral bristle present; middle of pro- 

 pleura hairless. 6 Wings of normal venation; apical cell open, rarely 

 closed in margin, ending more or less before apex of wing; bristles 

 present only at base of third vein, otherwise the veins bare ; posterior 

 cross- vein never more noticeably oblique than apical cross-vein; fourth 

 vein without a distinct fold; last section or fifth vein never half as 

 long as preceding section. Thoracic squamae not hairy; infrasquamal 

 setulae lacking. Abdomen usually black or gray, never metallic blue 

 or green ; wider than deep at base ; bristly in appearance with at least 

 marginal macrochaetae. Anterior tibiae usually with one or two 

 median posterolateral bristles. 



KEY TO THE GENERA 



1. Eye high, occupying nearly whole side of head; gena small or nearly linear, 

 not over one-twelfth the eye height (exclusive characteristics).' Usually 

 with only two sternopleural macrochaetae, sometimes three. (Hind 

 tibia ciliate on the anterolateral 8 side, at least in the male, with regular 

 comblike curved bristles, among which one or two sometimes stand out 



larger) 3. Carcelia (p. 37) 



Eye not high or occupying whole side of head ; gena larger, at least one-eighth 

 or more the eye height; usually more than two sternopleural macro- 

 chaetae 2 



*Aplomya submissa (Aldrich and Webber) is an exception. 



T Tlie term "exclusive characteristics" is used to indicate that the designated part of 

 the key will serve to separate the particular genus or genera from the rest of the genera 

 in the key. 



8 Anterolateral is the name used for the anterodorsal or outer front side of the tibia; 

 posterolateral, for outer back side of the tibia. 



