184. homalooranium. 

 Table showing Numbees of Shields. 



215 



meUmocephalmn 



annulatum 



trilineatum 



longifrontale . 



coronatum 



mbrum 



semicinctum 



fustyum 



schistoi 

 camtla 

 mmiat' 



virgatum 



mficeps 



bocourti 

 reticiilatum . 



mcestum 



vermiforme . 



breve 



'atriceps 



planters 



calamarinum 

 gracile 



133-171 



149 

 145-163 



158 

 138-158 

 149-179 

 143-180 

 136-159 



161 

 121-135 



110 

 147-152 

 154-175 



146 

 172-176 



148 

 140-148 



122 



111 

 123-125 

 121-153 

 119-132 

 112-133 



0. 



46-71 



54 

 68-69 



85 

 40-58 

 59-70 

 50-72 

 44^9 



46 

 32-38 



37 



55 

 57-65 



? 



55 



67 

 55-63 



26 



1 

 55-59 

 42-58 

 27-35 

 41-51 



1. Homalocranium melauocephalum. 



Coluber melanocephalus, Linn. Mus. Ad. Frid. p. 24, pi. xv. fig. 2 



(1754), and S. N. i. p. 378 (1766). 

 Elaps melanoceplialus, Wagl. in Spix, Serp. Bras. p. 8, pi. ii. b. fig. 1 



(1824). 

 Duberria melanocephala, Fitzing. N. Class. Hept. p. 65 (1826). 

 Cloelia dorsata, Wagl. Syst. Amph. p. 187 (1830). 

 Calamaria melanocephala, Schleg. Phys. Serp. ii. p. 38, pi. i. fig. 30 



(1837) ; Trosch. in Schmnb. JReise Brit. Guian. iii. p. 653 (1848). 

 Homalocranium melanocephalum, Dum. ^ Bibr. vii. p. 859 (1854) ; 



Bocourt, Miss. Sc. Mex., Rept. p. 588, pi. xxxvii. fig. 4 (1883). 

 ■ melanocephalum, part., Oiinth. Cat. p. 18 (1858) ; Jan, Arch. 



Zool. Anat. Phys. ii. 1862, p. 51, and Icon. Gen. 15, pi. ii. fig. 5 



(1866) ; Giinth. Biol. C.-Am., Rept. p. 147 (1895). 

 Tantilla melanocephala. Cope, Proc. Ac. Philad. 1861, p. 74, and 1868, 



p. 102. 

 Elapomorphus mexicanus, Giinth. Ann. Sf Mag. N. S. (3) ix. 1862, 



p. 57, pi. ix. fig. 1. 

 Tantilla melanocephala, part.. Cope, Proc. Ac. Philad. 1866, p. 126. 



capistrata, Cope, Journ. Ac. Philad. (2) viii. 1876, p. 181. 



Homa'ocraniam melanocephalum, vars. fraseri and pernambuoense, 



Giinth. Biol. C.-Am. p. 148. 



armillatum, part., GUnih. I. c. p. 149, pi. Iii. fig. 0. 



mexicanum, Giinth. I. c. p. 153. 



Eye about half as long as the snout. Eostral much broader than 

 deep, visible from above ; internasals not more than half as long as 



