276 



SNAKES OF CI2YL01SI. 



steps to 15 two heads -lengths before the vent. The rows 

 reduce from 21 to 19 by the absorption of the uppermost row 

 into the vertebral ; from 19 to 17 by the fusion of the third 

 and fourth rows from the ventrals ; from 17 to 15 the upper- 

 most row is again absorbed into the yertebral. Ventrals : In 

 males 206 to 221, in females 218 to 256. Anal: Entire. 

 Svbcaudals : In males 79 to 96, in females 75 to 88 ; divided. 

 (Figs. 55 and 56.) 



Ver 



cos 



Fig. 55. — Scales of D. trigonatus seen from above. 



ven 



Fm. .30. — Dipsadomorphu^ trigonatua to show scaling. 



(6) Anomalies — Supralahials : The second is rarely divided 

 into an upper and a lower part. Costals : Rarely 23 rows. 

 In one such specimen I noted that the fourth row from the 

 ventrals divided, and reunited several times in the forebodj'. 

 The steps of absorption may not occur in normal ordet. 

 Suhcaudals : A few of those near the base of the tail are 

 sometimes entire. 



