140 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lu 



hardly visible in Ageniella) ; in many species the last tergite is wholly 

 white or has a white spot in the middle. 



In both sexes the third cubital cell is longer and broader than the 

 second and extends nearer apex of wing than the marginal cell; the 

 basal vein in forewings is basad of the transverse vein by about the 

 length of the latter; in rear wings the subdiscoidal vein is generally 

 basad of cubitus but it is sometimes interstitial; lateral ocelli are from 

 1.0 to 2.0 as far from eyes as they are from each other; eyes are 

 lenticular and are almost parallel on inner edge (concave in some 

 species); posterior orbits and temples very narrow; anterior ocellus 

 almost always slightly larger than the laterals; propodeum is almost 

 jBat, hardly any declivity; in both sexes the claws have a small 

 sharp tooth near middle which extends at right angles from claw. 



I. MEXICAN, CENTRAL AMERICAN, AND CARIBBEAN SPECIES 



(Species 1-56) 

 Key to Species from Mexico, Central America, and the Caribbean 



FEMALES 



1. Abdomen wholly rufous 2 



Abdomen not rufous 3 



2. Head black, thorax greenish, antennae brownish, no white or rufous marks 



on head or thorax; forefemora and foretibiae yellow; middle and rear 

 femora yellow, the middle tibiae yellow beneath, the dorsal surface light 

 colored, violet tinted; all tarsi and posterior tibiae blackish; coxae and 

 trochanters black, with greenish reflection, strongly sericeous; wings 

 hyaline, veins brown; propodeum slightly striated in apical half; third 

 antennal joint longer than fourth; pronotum strongly sericeous on dorsal 

 surface; length about 9.0 mm. Panama .... 1. shannoni, new species 

 Head black with clypeus, cheeks, anterior orbits and fore part of head under- 

 neath, light yellow; pronotum reddish; head and thorax strongly golden 

 pubescent; all parts of legs including coxae yellow, except posterior tarsi 

 is darker colored; third antennal joint much longer than fourth; front part 

 of forewing from costal margin to back of cubital cells much darker colored 

 than the rear half of forewing or the rear wing; antennae yellow, browner 

 on dorsal surface; length about 11.0 mm. Trinidad. 



2. semialatus, new species 



3. Pygidial area mat, not polished and shining; depression of pronotum with 



cross-wrinkles; front trochanter entirely fulvous; dull black without irides- 

 cence; wings hyaline; apex of mandible ferruginous; legs beyond coxae 

 fulvous except apical tarsal joints; spurs brown; length about 11 mm. 

 U.S., Mexico, Central America (and A. mexicanus var. floridus Cresson). 



mexicanus (Cresson) 



Pygidial area polished and shining (or if not eyes converging below see 



couplet 46) 4 



4. Golden pubescence on head and thorax, or also on abdomen or only dense 



golden pile on face 5 



No golden pile on body anywhere 10 



