1909.] 



OPHIDIAX GENUS GRAYIA, 



951 



10. Hgr. $ . V. 147 ; C. 93. 



11. Ya:. V. 160; C. 94. 



12. 9 . V. 163 ; C. 94. 



13. ? . V. 159 ; C. 96. 



14. <?. V. 147; C. 98. 



15. Yg. y. 155 ; C. 95. 



16. Yg-. V. 152; C. 91. 



17. 9 . V. 161 ; C. 94. 



18. ? . V. 168 ; C. ? 



19. Head&tail. 



20. Hgr. V. 151 ; C. 97. 



21. Hgr. V. 149; C. 101. 



Boma, Congo. Dr. Leach (P.). (Type 



of C. smi/tini and of Gr. siluropJiac/a .) 

 Zambi, Lower Congo. Capt. Lepez (C). 



Leopoklville, Congo. Dr. J. L. Todd (P.). 



Mensem be, Upper Congo. Rev. J. H. Weeks (P.). 

 District of Victoria Falls. M. J. Capart (P.). 



Entebbe, Uganda. 

 Uganda. 



P > (Types of G. silurophaga.) 



SirH. H.Johnston (P.). 

 Mr. E. Degen (C). 

 Dr. Scott Elliot (P.). 



Grayia tholloni. 



Grayia tholloni Mocquard, Bull. Soc. Pliilom. (8) ix. 1897, p. 11 ; 

 Bouleng. Ann. Mus. Congo, Zool. ii. 1901, p. 17; Werner, Rep. 

 "Wellcome Res. Labor, iii. 1908, p. 170. 



Grayia fasciata Bouleng. t. c. p. 9, pi. iii. fig. 3. 



Eye rather large, as long as its distance from the nostril, 

 longer than its distance from the oral border. 27 to 30 maxillary 

 teeth on each side. Rostral once and a half to once and two 

 thirds as broad as deep, just visible from above ; nasal divided * ; 

 internasals as lono' as bi'oad or a little longer, shorter than the 



Text-fie-. 299. 



Head of Grayia tholloni. 



pra?frontals ; frontal once and three fourths to twice as long as 

 broad, longer than its distance from the end of the snout, as long 

 as the parietals ; loreal once and one third to once and a half as 

 long as deep; one prse- and two postoculars ; temporals 2-|-3t, 

 lower anterior not longer than its distance from the loreal ; 

 eight upper labials, fourth or fourth and fifth t entering the eye ; 



* Resting on the first labial only in the two type specimens, a character to which 

 Mocquard attaches undue importance ; the divided nasal rests on 2 labials in 3 out 

 of the 4 specimens examined by me. 



t Exceptionally y+^> according to Mocquard. 



X 4th and 5th entering the eye on the left side in a specimen from Barboi, on 

 both sides in one from Entebbe. 



