270 Atuiah (if the South African Mueeum. 



AVings hyaline oi- vory slightly tinged with yellow Pterostignia 

 narrow, rectangular, yellowish brown. Superior appendages of male 

 bent downward in distal third ...... plagiatus. 



5. Yellow colour of wings gradually deeper towards the tip.s. Pterostignia 

 yellowish in the central, brown in the marginal parts. Superior appen- 

 dages of males with three distinct medial teeth .... virgatus. 



Yellow colour of wings suddenly deepened to golden yellow in the 

 pteiostigmatic region. Pterostignia yellowish throughout. Superior 

 appendages of males with an acute sub-basal median tooth and a 

 trapezoid distal dilatation amicus. 



Lestes icteeicus (Gerstiicker, 1869). 

 This species is uot represented in the collections forwarded by 

 Dr. L. Pcriuguev. It is originally described from an incomplete 



Fig. 8. — Lestes ictericus, i . Okosongomingo. Appendages, right side 

 and dorsal view. 



male from Mombasa, The writer lias examined specimens from the 

 White Nile (Vienna and Stockholm Museums), an old female from 

 Dakar in the Selvsian collection (Brussels Museum), a good series 

 from the Kalahari desert (Berlin Museum, alcoholic specimens, 

 described in my paper on Schultze's voyage), and he can now add 

 2(^,1 9- from South-West Africa, "Farm Okosongomingo am 

 Kleineu Waterberg " (H. Thomsen, i-ii . 1913, Hamburg Museum). 



fj (Okosongomingo.) Labium and occiput whitish. 



Dorsum of head reddish ochreous ; free margin of labruiii, ant 

 clvpeus and geuae lighter, more whitish. 



Thoracic dorsum reddish ochreous, a meie trace of a lighter 

 yellowish line at the humeral suture ; the same ochreous colour on 

 mesepimerou ; metepisternum and metepimerou very light yellow, 

 turning to whitish on the ventral surface. A very small brownish 



