478 



tractcd portion imich lonp;ei' 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 eaudad of the eleventh seg- 

 ment; lateral gills not eonspicuously eontraeted beyond the 



middle unguiculatus. 



ec. Ovijxisitor of female extending eaudad of the eleventh segment ; 

 lateral gills conspicuously contracted beyond the middle, .uncatus. 

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

 without a median row of black sjiots. 



c. Lateral keels of segments 1-0 or 2-9 with long apical spines; 

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



conspicuously naiTowed beyond the middle vigilax. 



ec. 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 ) jorcipniux. 



I rectangularis. 



ADULTS 



Females 



a. Dorsum of thorax green. 



b. Wings flaveseent eurinus. 



bb. Wings not flaveseent. 



c. Occiput and postgenae pale inaequalis. 



cc. Occiput and postgenae black. 



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. . . .vigiJns. 

 aa. Dorsum of thorax black or dai'k brown, never green. 



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



carina congener. 



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

 ventral carina, 

 e. Occiput and postgenae pale buff or yellow ; abdomen with a 



greenish tint unguiculatus. 



cc. Occiput an<l postgenae black or very dark bi'own ; abdomen never 



with a greenish tint. 



. ( forripafus. 



d. Tarsi black above ] disjunctus. 



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



