478 



tracted portion much longer than the expanded portion and less than 

 one-third the width of the latter. » 



b. Gills pointed at tip (Figs. 51,52) ; venter of abdomen without a 

 median row of black spots. 



c. Ovipositor of female not extending caudad of the eleventh seg- 

 ment; lateral gills not conspicuously contracted beyond the 



middle unguiculatus. 



cc. Ovipositor of female extending caudad of the eleventh segment ; 

 lateral gills conspicuously contracted beyond the middle. . uncatus. 

 bb. Gills not sharply pointed (Fig. 49) ; venter of abdomen with or 

 without a median row of black spots. 



e. Lateral keels of segments 1-9 or 2-9 with long apical spines ; 

 venter of abdomen without a median row of black spots ; gills not 



conspicuously narrowed beyond the middle vigilax. 



cc. Lateral keels of segments 3-9 or 4—9 with apical spines ; gills 

 (Fig. 49) conspicuously narrowed beyond the middle; venter of 



abdomen with a median row of black spots j forcipatus. 



\ rectangularis. 



ADULTS 



Females 

 a. Dorsum of thorax green. 



b. Wings flavescent eurinus. 



bb. Wings not flavescent. 



c. Occiput and postgenae pale inaequalis. 



cc. Occiput and postgenae blaclv. 



d. Basal half of first abdominal segment yellow ; stigma always 

 surmounting less than three cells; length usually about 



35 mm uncatus. 



dd. Basal half of first abdominal segment black; stigma usually 

 surmounting three or more cells; length 43-47 mm. . . .vigilas. 

 aa. Dorsum of thorax black or dark brown, never green. 



b. Metepimera with a black spot above and below the latero- ventral 



carina congener. 



bb. Metepimera without a black spot above and below the latero- 

 ventral carina, 

 c. Occiput and postgenae pale buff or yellow ; abdomen Avith a 



greenish tint unguiculatus. 



cc. Occiput and postgenae black or very dark brown ; abdomen never 



with a greenish tint. 



,„.,,-, f forcipatus. 



d. Tarsi black above \ di^junctus. 



dd. Tarsi with more or less pale yellow above rectangularis. 



