106 INTRODUCTION. 



the lip, sometimes narrowly interrupted above ; 

 labial teeth in f series, disposed in two or 

 three rows, at least in the second series. 



A. Spiraculum equally distant from the anterior 



and the posterior extremity of the body ; tail 

 at least once and a half the length of the body, 

 and three and a half or four times as long as 

 deep ; caudal crests with a polygonal network 

 of fine black lines . . . DiscoGLOSSus. 



B. Spiraculum nearer the posterior than the ante- 



rior extremity of the body ; tail not more 

 than once and a half the length of the body, 

 twice to twice and a half as long as deep ; 

 caudal crests with fine black decussating hues. 



BoMBINATOR. 



Mouth trigonal . . . B. igneus. 

 Mouth elliptical . . . B. paehypus. 



0. Spiraculum nearer the anterior than the poste- 

 rior extremity of the body ; tail at least once 

 and a half the length of the body, twice and 

 two-thirds to thrice and a half as long as 

 deep ; no black network . . Alttes. 



II. Spiraculum sinistral; labial teeth disposed in 

 a single row in each series or ridge. 

 A. Anus median. 



1. Spiraculum directed upwards and back- 

 wards ; lower lip bordered with papillae ; 

 series of labial teeth |- or -I. 

 a. Tail obtusely pointed, with fine black de- 

 cussating lines ; an~ inverted fold on each 

 side of the lip, the upper edge of which 

 bears a long series of teeth ; beak white 

 with black edge . . Pelodytes. 

 ' h. Tail acutely pointed, without black lines ; 

 first series of upper labial teeth short ; 

 beak entirely black . . Pklobates. 

 Tail once and a half to twice as long as the 

 body .... ^P.fuscus. 



