HYDROSAURUS 143 



Measurements of Hydrosaurus pustulosus (Eschscholtz) . 



mm. 



Total length 897 



Snout to vent 255 



Tail 642 



Snout to foreleg 98 



Axilla to groin 118 



Length of head 62 



Width of head 36 



Foreleg 128 



Hind leg 210 



Height of tail fan 35 



Variation. — A female from the same locality differs from the 

 male in having a lower caudal fan and a higher nasal crest. A 

 lateral fold from axilla to groin is much more prominent than 

 in the male, which is a smaller specimen; there are twelve 

 femoral pores on each side. 



Of the two specimens in my collection from Mindoro, one 

 has the body scales about a third larger and, instead of sixty- 

 four scales (as in the Polillo specimen) from dorsal crest to 

 the axilla-to-groin fold, there are only about forty-eight in the 

 widest part ; the row of groups of enlarged scales is present and 

 an additional row of single scales is present between this and 

 the crest ; there is a very distinct break in the dorsal crest above 

 the shoulder which is filled with very small lanceolate scales; 

 the enlarged scales on the( outer edges of the abdomen are much 

 more numerous than in the described specimen; the enlarged 

 scales above the labials are broken up into rows of small scales ; 

 temporal scales are enlarged and are strongly compressed and 

 keeled; the diverging series of chin shields are separated from 

 each other and do not touch any labials; no definite groups of 

 scales are present on neck below the angle of the jaws ; seventeen 

 femoral pores present on each side; the pores are larger in the 

 Polillo specimens; the lanceolate spines on the caudal fan are 

 more prominent. The second specimen from Mindoro repre- 

 sented by a mutilated skin has the nasal crest wanting but the 

 dorsal lepidosis resembles the other Mindoro specimen. Two 

 young Negros specimens are in the collection, and a single one 

 from Mindanao. 



Remarks. — This species is regarded by Barbour as differing 

 from Lophura amboinensis Schlosser. I have no extra-Philip- 

 pine material for comparison, but have followed his conclusions. 



