219. DBNISONIA. 333 



nasal entire or divided ; no loreal. Body cylindrical ; scales smooth, 

 without pits, in 15 to 19 rows ; belly rounded. Tail moderate or 

 short ; suboaudals single (in one species in two rows). 

 Australia, Tasmania, Solomon Islands. 



Synopsis of the Species. 



I. Anal entire; frontal not much broader than the supraocular, 



once and a half to twice and two thirds as long as broad ; 

 pupil round. 



A. Scales in 15 or 17 rows ; nasal in contact with the prseocular. 



1. Veatrals 136-160; suboaudals 38-57; scales in 15 (ex- 



ceptionally 17) rows. 



Frontal once and three fourths to twice 



as long as broad; ventrals 145-160 . . 1, superha, p. 335. 

 Frontal once and two thirds to twice as 



long as broad ; ventrals 138-151 ; a 



black nuchal collar 2. coronata, p. 335. 



Frontal twice to thrice as long as broad ; 



scales striated ; ventrals 136-151 .... 3. coronoides, p. 336. 



2. Ventrals 118 ; scales in 17 rows. 4. muelleri, p. 337. 



B. Scales in 19 rows ; nasal not reaching the prseocular ; ventrals 



167 ; suboaudals 35 5. frenata, p. 338. 



II. Anal divided ; frontal much longer than broad ; pupil round. 



A. Scales in 15 rows ; nasal not reaching the prseocular ; ventrals 



164; suboaudals 51 6. ramsayi, p. 338. 



B. Scales in 17 rows ; nasal in contact with the prseocular. 



Frontal once and two thirds to twice as 

 long as broad ; ventrals 153-170 ; sub- 

 oaudals 41-56 7. signata, p. 338. 



Frontal once and a half as long as broad ; 



ventrals 147-168 ; suboaudals 33-45 . . 8. dcBtnelii, p. 339. 



III. Anal entire ; frontal much broader than the supraocular, once 

 and one fifth to once and three fourths as long as broad ; pupil 

 often vertically elliptic or subelliptic. 



A. Scales in 19 rows ; ventrals 154-164 ; suboaudals 25-30. 



Nasal in contact with the prseocular .... 9. suta, p. 339. 

 Nasal not reaching the prseocular 10. frontalis, p. 340. 



B. Scales in 17 rows; ventrals 121-138; suboaudals 20-30. 



Anterior chin-shields as long as the pos- 

 terior 11- Jlagellum, p. 340. ] 



Anterior chin-shields shorter than the 



posterior 12. maculata, p. 341. 



