The Ocionata nr Drinionjlies of South Africa. 393 



ridge or anterior flattened spaces of frons. Thorax yellowish with broad, 

 deep black stripes; median, ante humeral, humeral on suture; narrow 

 black lines between humeral suture and metastigma, above metastigma 

 and on second lateral suture. Mid-dorsal black band on abdomen com- 

 paratively broader than in last species ; no lateral black bands, only 

 narrow black lining of lateral cariuae ; ventral surface black. Female with 

 foliaceous dilatation of eighth segment broader and appendages short. 

 Mature males pruinose to disappearance of pattern first on abdomen, 

 finally also on thorax. ^ , Abd. 29, hdw. 29, pt. S'o mm. ? , 28, 30, 4 



0. icieromelas. 



5. Almost regularly two rows of cells between Rs and fisp?, at least for a short 



space 6. 



Regularly but one row of cells between fls and Ssjji. Abdominal pattern 

 of non-prninose males and of females consisting of broad lateral con- 

 tinuous black bands. Pterostigma large, light yellowish between black 

 veins ............. 8. 



6. Abdominal pattern of non-pruinose males consisting of lateral black bands, 



complete or not fully touching lateral carinae or even interrupted in 

 middle of segments, of females similar but reduced in various degrees 



and almost regulaily interrupted 7. 



Abdominal pattern of non-pruinose males and of females similar to 

 0. stemmale capense ; on segments 3 -7 broad median transverse yellowish 

 bands, interrupted by a narrow mid-dorsal black line, almost regularly 

 extended narrowly along that line to anterior margin of segments. 

 Thoracic dorsum greenish or olivaceous ; a mere vestige of blackish on 

 median suture, incomplete ante-humeral and Inimeral blackish lines ; 

 sides with four dark lines of variable development ; in specimens in 

 perfect condition of colours two broad bands whitish (or lighter greenish 

 than rest of sides), mesepimeral and metepimcral, gradually obscured 

 from ventral to dorsal margin. Lijis yellowish, often with median lobe 

 of labium dark. Face and frons light olivaceous, very narrow basal 

 black line on frons. Pterostigma light yellow between lilack veins, the 

 costal one mostly thickened. Variable golden yellow spot on base of 

 hind wings to apex of membranule. Mature males mostly pruinose on 

 abdomen and thorax to the complete disappearance of pattern. <J, Abd. 

 31, ;idu'. 33, pt. >3mm. $,31,32,3 . . . . O.brachiale. 



7. Thoracic sides with two distinct whitish stripes ; immediately behind 



humeral and second lateral sutures ; these stripes most distinct at 

 ventral end, where they are lined with blackish, gradually darkened to 

 dorsal end. Thorax otherwise olivaceous, shading to ferruginous, a mere 

 vestige of blackish on median suture and an incomplete ante-humeral 

 blackish line, which is accompanied (at least in part of specimens) 

 medially by a third somewhat diffused whitish stripe. Lateral abdominal 

 black bands narrow and sometimes interrupted in males, very narrow 

 and often indistinct in females, when the abdomen appears ferruginous 

 almost without markings. Face and frons olivaceous with very narrow 

 black basal line. Pterostigma shorter and narrower than in following 

 species, ferruginous. Small golden yellow basal spot at membranule of 



