326 ACRONURID^, 



Si/tiopsis of the Species. 



I. With nine or eight (seven) dorsal spines, with broad fixed incisors, and 

 with five soft ventral rcays. 



A. With black cross-bands on the head and body. 



1. A. triostegus 



(pentazona). 



B. With two white cross-bands on the anterior part of the body. 



2. A. gaittatus. 



C. Coloration of the body nearly imifomi, without conspicuous mark- 



ings. 



* Groimd-colour brown ; sometimes a whitish ring roimd the base 



of the caudal fin. 



3. A. chirui'gus. 5. A. nigro-fuscus. 7. A. nigros. ■ 



4. A. matoides 6. A. bipimctatus. 8. A. doreensis. * 



(lamarrii). 



* Uniform yellow. 



9. A. chrysosoma. 



* Some blue or red dots anteiiorly. 



10. A. rubropimctatus. 11. A. marginatus. 



D. Body with bluish longitudinal bands or lines, or with dots disposed 



in longitudinal series. 



12. A. lineatus. 15. A. undulatus. 18. A. bleekeri. 



13. A. striatus. 16. A. dussumieri. 19. A. cferuleus. 



14. A. sohal. 17. A. grammoptilus. 20. A. lineolatus. 



E. A yellow or black marking on the shoulder or superiorly on the 



gill-opening. 



21. A. olivaceus. 23. A. tennentii. 24. A. gahm. 



22. A. pyi'ofenis. 25. A. nunimifer. 



F. A whitish ring round the mouth or round the lower jaw. 

 2(3. A. glaucopareius. 28. A. fuscus. 29. A. leucosternon. 

 27. A. celebicus. 30. A. achilles. 



G. Tail with a black triangle. 



31. A. triangulus. 

 H. A blue spot below the dorsal fin. 



32. A. fraterculus. 



II. The soft portion of the ventral fin not fully developed. 



33. A. hepatus. 



III. Teeth setiform, moveable, dilated only at the extremity. 



34. A. strigosus. 35. A. ctenodon. 



IV. With only five to three dorsal spines. 



36. A. rhombeus. 39. A. gemmatus. 42. A. desjardinii. 



37. A. goranieneis. 40. A. velifer. 43. A. riippellii. 



38. A. xanthurus. 41. A. hypselopterus. 44. A. suillus. 



