120 



MISS M. L. HETT ON 



4. PoROCEPHALUS BIFURCATUS Var. ORIENTALIS, 110V. (Text- 



fig. 4, C, D.) 



There were 16 specimens obtained as follows: — 



I 2 from Zamenis mucosus. (There were also 3 specimens 



of P. pattoni in the same snake.) 



II $ 's from Naia tripudicms. 

 4 J 's from Naia tripudians. 



They differ from P. bifurcatus in the following particulars :■ — ■ 



(1) The body is relatively more slender. 



(2) The rings are 40 or occasionally more in number, while in 

 P. bifurcaius they are usually under 40. 



(3) The mouth is more oval and the anterior end of the 

 cephalothorax is slightly more rounded. 



Text-figure 4. 



A. Porocephalus bifurcatus, ? , X 2. B. "P. houlengeri" ?,X2. C. Head of 

 P. bifurcatus. var. orientalis, X 8. D. P. b. var. orientajis, ? , X 2. 

 E. Head of P. bifurcatus var. mediterraneus. X 10. F. P. b. var. medl- 

 terraneus, $ , X 2. 



