242 



Mr. II. Campion on some 



suture, and is bordered on each aide by a streak of dark 

 brown ; otherwise, the sides of the thorax are yellowish 

 brown. 



In cliaracteristic examples of hrachiale, on the other hand, 

 tiie ground-colour is greenisli througliout, witii dark markings 

 as in chrysostigma, added to which there are two dark stripes 

 crossing the metathorax ; but in Nyasaland, at least, the 

 dorsum tends to become very pale, and the mesepimeral 

 stripe tends to take on a whitish hue. Just as the Lingadzi 

 specimens oi' brachiafe vary in the direction of chrysosligmay 



Fig. 1. 



Fig. 2. 



Fig. 3. 



QeiiitaUa of three males of Orthetrnm from the Liugadzi River, 



Nyasaland. 



Fig. l.— O. hrachiah, V. de B., 23, ii. 1.5. 



Fig. 2.— 0. hrachialp, P. de B., 4. iii. 15. 



Fig. 3. — O. chrysodiymu, Barm., 8. ii, 15. 



P. Highley, cam. luc. et del. 



so do the Monkey Bay examples of chrysostigma vary in the 

 direction of bracMale, and in many cases the thoracic colour- 

 scheme affords little guidance to the identification of the 

 species. 



The black markings on the abdomen are distributed in 

 different ways in the two species, but, as tliey are seldom 

 visible in dried specimens, they are not of much value as aids 

 to identification. When semi-adult individuals are met with, 



