14. HELicops. 279 



Helicops Cyclops, Cope, Proc. Ac. Philad. 1868, p. 309. 

 ? Helicops fumigatus, Cope, I. o. p. 808. 



Eye small ; rostral visible from above, usually in contact with 

 the internasal ; frontal once and a half to once and two thirds as 

 long as broad, as long as or a little longer than its distance from 

 the end of the snout, as long as or a little shorter than the 

 parietals ; loreal as long as deep or deeper than long ; one prae- 

 and two postoculars ; temporals lor 2+2 or 3, posterior keeled ; 

 eight upper labials, fourth entering the eye; five or six lower 

 labials in contact with the anterior chiji-shields, which are as long 

 as the posterior. Scales in 19 rows, strongly keeled even on the 

 occiput and nape ; outer row more or less distinctly keeled, rarely 

 smooth. Ventrals 102-130 ; anal divided ; subcaudals 61-94, 

 keeled. Olive or grey-brown above, with more or less regular 

 dark brown, black-edged cross bands, which narrow towards the 

 sides, where they are usually confluent with the black cross bands 

 of the belly ; a large rhomboidal dark blotch on the nape ; lower 

 parts yellowish (in spirit) with large black spots, or, more usually, 

 with regular black cross bands. 



Total length 730 millim. ; tail 200. 



Tropical South America east of the Andes. 



a. 2 (V. 120 ; C. 61). British Guiana. 



h-e,f-g. d'(V. 116, 117; Demerara. Mr. Snellgrove [0.]. 



C. 72,73) & $ (V.120, 



1--'0,122,130;C.63,65, 



67, ?). 

 h, i. S (V. 113 ; 0. 72) & Berbice. 



2 (V. 120 ; 0. 65). 

 k. S (V. 116 ; 0. 94). Para. 



I. Yg. (V. 118; C. ?). Pernambuco. W. A. Forbes, Esq. [P.], 



m, ru $ (V. 114 ; 0. 71) & Upper Amazon. 



vj;-. (V. 115; C. 83). 

 o Hot. (V. 102; 0. 82). Pebas. H. W. Bates, Esq. [0.]. 



p-t °c? (V. 112; C. 73), Moyobamba, Mr. A. H. Koff[O.J. 



2 (V. 114 ; 0. 62), & yg. N.E. Peru. 



(V. 110, 111, 108; 0.77, 



62, 76). 

 u 2 (V. 109 ; C. 72). Sarayacu, N.E. W. Davis, Esq. [0.]. 



Peru. Messrs. Veitch [P.]. 



V. Skull. Santa Cruz, 



Brazil 



10. Helicops scalaris. 



Helicops scalaris, Jan, Arch. Zool. Anat. Phys. iii. 1865, p. 250, and 

 Icon. Gen. 28, pi. iii. fig. 1 (1868). 



Eye small ; rostral just visible from above and in contact with 

 the internasal'; frontal twice as long as broad, a little longer than 

 its distance from the end of the snout, a little shorter than the 

 parietab ; loreal trapezoid ; one pree- and two postoculars ; tem- 

 porals 2+3; nine upper labials, fourth or fourth and fifth entering 



