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loud and exerted both by day and night, and though very 

 startling when first heard, should be welcome, as these animals are 

 great destroyers of insects and will devour young rats ; and 

 even capture bats. 



G. Stentor, Cantor. 



0. Verreauxii, Tytler. J. A. S., B., 1864, p. 546. 

 Back covered with small flat granular scales, with ten longi- 

 tudinal rows of large tubercles. Tail with a double row of 

 enlarged subcaudals. Prseanal pores 13 in a slightly angular 

 series. Colour above pale brown or ashy, with some darker 

 markings. Tail dark and white-banded. Below whitish. 

 Grows to 14 inches. 



Inhabits Chittagong, Akyab, Birmah, The Andaman islands, 

 The Malayan Peninsula, Pinang, &c. 



This species is readily distinguished from guttatus by its 

 enlarged subcaudal shields. Its voice is a ' tuk-tuk-tuk' several 

 times repeated. The bite of both species is dreaded as poisonous 

 by the natives and ignorant Europeans, though of course only 

 to be avoided from the severe nip which these animals can 

 inflict. 



G. monarchus, D. et B. 

 Back covered with small flat granular scales, with numerous 

 small conicle tubercles arranged in irregular longitudinal series. 

 Tail with band like narrow, irregular subcaudals. Prseanal and 

 femoral pores, 32 disposed in a continuous curved series. Colour 

 above buff or reddish brown, with from 8 to 12 pairs of regu- 

 larly rounded distant dark brown spots along the spine. Head, 

 sides, and limbs, dark-spotted. Beneath yellowish white. Length 

 7 inches, 



Inhabits Ceyloft, also the Malayan Peninsula, the Philippine 

 islands, Amboyna, and Borneo. 



The voice of this species is a ' tok ' repeated six or eight times 

 with increasing celerity. 



