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1. L. 1. 60; eye 4 times in head, thrice 

 in interorbital space, barbels twice as 



long as eye H. modiglianii ') p. il. 



2. L. 1. 63 — 73 ; eye 6 times or less in 

 head, more or less than twice in inter- 

 orbital space; barbels slightly longer or 

 slightly shorter than eye ; origin of dorsal 

 before middle of length. 



a. Origin of A. much nearer to base of 



C. than to that of V. Ventral surface 



scaly only between and behind ventrals. 



a!. 30 scales between dorsal and oc- 

 ciput H. gymnogaster p. 11. 



/3'. 50 scales between dorsal and oc- 

 ciput H. antphisquamata p. 12. 



/3. Origin of A. in the middle between 



base of C. and that of V. Ventral 



surface scaly only behind ventrals. . H. heterolepis p. 12. 



3. L. 1. 74; eye S'/^ times in head, more 

 than twice in interorbital space, outer 

 barbels scarcely visible, inner ones equal 

 to eye, origin of D. behind middle of 



length H. whiteheadi p. 13. 



b. Abdomen totally scaly H. lepidogaster p. 14, 



II, Origin of dorsal before origin of ventrals. (^Ho- 

 maloptera s. str.). 



1. L. 1. 45 — 48. 



a. Height 8 — S'/o- Scales on upper surface 



with a single strong keel H. zollingeri p. 14. 



b. Height 10I/4 — ii'/a- Scales on upper sur- 

 face with a single keel, the anterior ones 



with 2 or 4 short keels besides H. ophiolepis p. 15. 



2. L. 1. 63 to about 70. 



a. Ventral surface, except between pectorals, 



totally scaly //. orthogoniata p. 15. 



b. Ventral surface scaly between anus and anal 

 and on a triangular patch before ventrals, 

 otherwise naked. 



a. Height less than 7. Longest rays of 



pectorals shorter than head H. crythrorhina p. 17. 



l) We are not sure that H. modiglianii belongs to this group, as the diagnosis 

 of Perugia of this species gives no information about the absence or presence 

 of scales on the abdomen. 



