326 ACRONURIDJi. 



Sytiopsis of the Species 



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

 with five soft ventral rays. 



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. guttatus. 



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



ings. 



* Ground-colour brown ; sometimes a whitish ring round the base 



of the caudal fin. 



3. A. chirurgus. 5. A. nigro-fuscuw. 7. A. nigi-os. 



4. A. matoides G. A. bipunctatus. 8. A. doreensis. 



(lamarrii). 



* Uniform yellow. 



9. A. chiysosoma. 



* Some blue or red dots anteriorly. 



10. A. rubropimctatus. 11. A. mai^inatus. 



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. cseruleus. 



14. A. sohal. 17. A. grammoptihis. 20. A. lineolatus, 



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



gill-opening. 



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



22. A. pyroferus. 25. A. nunmiifer. 



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



26. A. glaucopareius. 28. A. fuscus. 29. A. leucostemou. 



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 cxtremitj-. 



34. A. strigosuR. 35. A. ctenodon. 



IV. With only five to three dorsal spines. 



36. A. rhombeus. 39. A. gemmatiis. 42. A. de.^jardinii. 



37. A. goramensis. 40. A. velifer. 43. A. riippellii. 



38. A. }«inthurus. 41. A. hypselopterus. 44. A. suillus. 



