42 CYPRINODONTID.E. 



D. 8-9 ; A. 13-14 ; Sc. 24-26 ; caudal rounded- 

 acuminate ; caudal peduncle 1^ times as 

 long as deep 16. //. decorsii, Pellegr., p. 57. 



D. 8 ; A. 12 ; Sc. 28 ; caudal rounded ; caudal 



peduncle 1£ times as long as deep . . .17. //. exiguus, Blgr., p. 57. 



b. 29-32 scales in longitudinal series. 

 D. 8 ; A. 14-15 ; Sc. 30-32 ; caudal forked 



in the male; caudal peduncle nearly twice 



as long as deep 18. H. elegans, Blgr., p. 58. 



D. 9-10 ; A. 14-15 ; Sc. 30-32 ; caudal 



rounded ; caudal peduncle a little longer 



than deep 19. II. petersii, Sauv., p. 59. 



D. 9-10; A. 12-13; Sc. 29-30; caudal 



acuminate or rounded-acumiuate ; inter- 

 orbital width 2 diameters of eye, which is 



3f to 4 times in length of head . . . . 20. II. calliurus, Blgr., p. 59. 

 D. 9-10 ; A. 13 ; Sc. 30-31 ; caudal rounded ; 



interorbitul width 1^ diameters of eye, 



which is 3£ times in length of head . . 21. //. striatus, Blgr., p. 60. 



2. Eye not more than 3 times in length of head, not or but slightly shorter 

 than postocular part of head. 

 a. Caudal rounded. 



«. Caudal peduncle not longer than deep ; ventral nearer end of snout 

 than caudal. 

 D. 7-8 ; A. 13-14 ; Sc. 25-28 ; lower jaw 



not projecting 22. II. spilauchen, A. Dum., p. 61. 



1). 8-9 ; A. 13-15 ; Sc. 23-24 ; lower jaw 



projecting 23. H. Judereaui, Blgr., p. 63. 



/3. Caudal peduncle longer than deep ; lower jaw projecting. 

 * Ventral equally distant from end of snout and from caudal. 



D. 7-8 ; A. 14-15 ; Sc. 24-28 2L H. load, Blgr., p. 63. 



D. 6-7 ; A. 11-12 ; Sc. 26-27 . . . . - . 25. H. Ungii, Blgr., p. 64. 



** Ventral much nearer end of snout than caudal. 



P. 7-8 ; A. 12-13 ; Sc. 25-28 ; caudal pe- 

 duncle 1\ to 2 times as long as deep ; 

 diameter of eye much less than inter- 

 orbital width 26. H. schoelUri, Blgr., p. 65. 



D. 7-8 ; A. 14-16 ; Sc. 26-28 ; caudal pe- 

 duncle twice as long as deep ; diameter 

 of eye a little less than interorbital 

 width : .... 21. H. moeruensis, Blgr., p. 66. 



