30 



A REVISION OF THE TSETSE-FLIES (GLOSSINA). &C. 



proved. Finally, a specimen of Dr. Morrison's, which had not. lieen ex^iosed to 

 naphthaline at all, was found to be black." 

 In all, 93 examples have been examined. 



Comparative Table of the Morplwlogical Characters of the Superior Claspers of 

 G. morsitans and G. submorsitans. 



Median lobes {ml in 

 figs.). 



Heel or posterior 

 angle. 



Snbmedian promi- 

 nence. 



Inner lateral marain 



Upper lateral group 

 of bristles. 



December 20th, 1910. 



G. submorsitans. 

 With the outer (free) 

 margins straight and 

 parallel : sub-apical 

 tubercle distinct, 



when extended. 



Usually strongly pro- 

 duced distally. 



Relatively small, rarely 

 extending beyond the 

 heel ; bristle inserted 

 near the margin. 



Narrowly rounded dis- 

 tally ; and consider- 

 able produced. 



Relativelv long. 



G. morsitans. 



With the outer margins 

 curved and converginr/ 

 distally ; apex with 

 a median line or 

 division ; snbapical 

 tubercle absent. 



Usually broadly rounded. 



Very prominent and 

 usually projecting 

 considerably beyond 

 the heel : bristle in- 

 serted considerably 

 within the margin. 



Broadly rounded dis- 

 tally ; and not mar- 

 kedly produced, 



Relativelv short. 



