458 Lewis Henry Gough, 



extended, as it is obvious tliat an individual cannot exceed the limit 

 of Variation of the species it belong-s to. 



The anomalities chiefly occurred in the number of the temporals, 

 these seem to nie to be on the whole more variable and less con- 

 stant in form and arrangement than the other head-shields ; almost 

 as many deviations from the rule, or from symetry, are to be observed 

 in the upper labials. The other head-shields are much more cou- 

 stant, the postoculars and lower labials being the next most variable. 

 As a general rnle, as has been pointed out by Professor Döderlein, 

 the larger the niimber of shields of any kind, the greater the ten- 

 dency to prodnce anomalies. (Döderlein, „Ueber die Beziehungen 

 nahe verwandter Thierformen", in: Zeitschr. f. Morphologie und 

 Anthropologie 1902.) 



I have also included such snakes in tliis list, as have abnormal 

 numbers of rows of scales around the body, or whose anal scale is 

 divided when it sliould be entire or vice versa, and also in one case 

 a colour- Variation. 



The terms employed are those used by Mr. Boulenger in his 

 Catalogue, E and L indicatiug the side of the head referred to; 

 when lower labials are mentioned, only those in contact with the 

 anterior chin-shields are referred to. 



Corallus hortulanus (L.). 



a) Chili, FßAKK 1892. 



Loreais : R 2, L 3, normal 2. 



Polyodontophis annulatus (D. B.). 



a) Mexico, Weber 1865. 



Temporals R 1 + 2, L 1 + 1, normal 1 + 2 or 2 + 3. 



b) Mexico. 



Body tili vent red with pairs of black bars enchosing a 

 lighter zone, tail grey with 3 longitudinal series of 

 small black spots. Normal: Anterior half of body red 

 with pairs of black bars enclosing a yellow or lavender- 

 grey zone, tail grey with 3 longitudinal series of small 

 black spots. 



Tropidonofus ordinatus (L.) var. sirtalis (L.). 



a) Cambridge, Cambridge Museum, Mass. U. S. A. 1876. 

 2 superposed loreals, normal one loreal. 



