168 E. E. AUSTEN— THREE NEW SPECIES OP THE GENUS CHKYSOPS, &C. 



C. roellmanii are still unknown, and it is consequently at present impossible to 

 make a complete comparison of the two species, the latter of which, however, 

 apart from less conspicuous characters, can at once be distinguished from C. cana 

 by the general coloration of its abdomen, which is ochraceous-bufF or tawny. 

 The milk-white hue of the abdomen of C. cana, with its thick covering of white 

 hair, will indeed distinguish the species from any other African Chrysops at 

 present described. 



While no information as to its habitat has yet been received, the remarkable 

 coloration of the insect described and illustrated above would seem to indicate 

 adaptation to existence in a sandy or desert region. 





