pepsinae: tribe macromerini 169 



the tibia longitudinally weakly grooved or concave; sixth sternite of 

 male with a short apical longitudinal ridge terminating in a rounded 

 eminence; subgenital plate of male with a median longitudinal ridge 

 which fades out before the apex. 



Male with the face black but with a more or less distinct longitudinal 

 whitish or yellowish mark next the eye (not marked thus in the other 

 subgenera) ; spurs of fore and middle tibiae of male usually whitish to 

 dusky stramineous (blackish in A. reynoldsi) ; spurs of hind tibia of 

 male blackish. 



This subgenus includes larger species. It seems well distinguished 

 from all the other subgenera, but is close to Nemagenia. Five species 

 are included, four from the southern portion of the Nearctic region 

 and an undetermined species from the State of Morelos in Mexico 

 (Evans and Berkeley). 



Keys to the species of the subgenus Leucophrus 



MALES 



1. First three tergites ferruginous or largely so 2 



First three tergites black or blackish 3 



2. Forewing slightly tinged with fuscous, the apex infuscate; veins of forewing 



dark brown 1. semitincta (Banks) 



Forewing tinged with yellowish, the apex infuscate; veins of forewing brownish 

 stramineous, dark brown in the apical fuscous area . . 2. reynoldsi (Banks) 



3. Upper part of head and of pronotum very densely punctate, the punctures so 



close that these parts are dull and the ridges between neighboring punctures 

 on the frons are about 0.25 the diameter of the punctures . 3. incita (Banks) 

 Upper part of head and of pronotum rather densely punctate, but the punctures 

 separated enough that these parts are somewhat shining and the ridges be- 

 tween neighboring punctures on frons are about 0.35 the diameter of the 

 punctures 4. fulgifrons (Cresson) 



FEMALES 



1. Abdomen ferruginous 2 



Abdomen black 3 



2. Wings weakly infuscate, the apical part of the forewing darker; pubescence 



of head and thorax silver gray; third cubital cell receiving the second recur- 

 rent vein at its middle 1. semitincta (Banks) 



Wings yellow, the apical margin of the forewing fuscous; pubescence of head 

 and thorax dark brown; third cubital cell receiving the second recurrent vein 

 at its basal 0.4 2. reynoldsi (Banks) 



3. Clypeus, face, and frons with dense whitish pubescence that is not especially 



long; top of head, of pronotum, and of mesothorax with dense pubescence; 



wing veins fuscous 3. incita (Banks) 



Clypeus, face, and lower lateral portions of frons with dense, long, golden 

 pubescence; top of head, of pronotum, and of mesothorax with rather sparse 

 pubescence; wing veins yellowish brown 4. fulgifrons (Cresson) 



