96 silurid-s:. 



times in the total length. The maxillary barbels do not extend to 

 the end of the opercle. Trunk and hinder half of the tail black. 



Java. 

 a. One of the typical specimens. From Dr. P. v. Bleeker's Collection. 



6. Acrochordonichthys ischnosoma. 

 Bleeker, Prodr. Silur. p. 232, and Ail. Ichth. Silur. p. 70. tab. 84. fig. 4. 

 D. 1/5. A. 10. P. 1/7. 



The median groove on the upper surface of the head terminates at 

 a considerable distance from the base of the occipital process ; occi- 

 pital process elongate-ovate. The greatest width of the body is con- 

 tained five times and two-thirds in the total length. The maxillary 

 barbels extend to the operculum. Entirely brownish. 



Java. 



a. Type of the species. From Dr. P. v. Bleeker's Collection. 



38. AKYSIS. 



Akysis, Bleek. Prodr. Silur. p. 234. 



Parabagrus, Bleek. Nederl. Tydschr. Dierk. 1863, p. 100. 



Adipose fin of moderate length ; a short dorsal fin with one spine 

 and five soft rays ; anal fin short. Barbels eight. The upper jaw 

 is somewhat longer than the lower; teeth villiform, palate edentu- 

 lous. Head covered with soft skin above ; skin tubercular ; eyes 

 very small, below the skin ; a lateral line. Caudal emarginate or 

 forked ; pectorals horizontal ; ventrals with six rays. Gill-opening 

 of moderate width, extending upwards to the extremity of the opercle, 

 the gill-membrane reaching across the isthmus, slightly emarginate 

 behind. 



Java. 



1. Akysis ariegatus. 



Pimelodus variegatus, Bleek. Verh. Bat. Gen. xxi., Silur. Batav. p. 53. 

 Akysis variegatus, Bleek. Prodr. Silur. p. 235, and All. Ichth. Silur. 

 p. 65. tab. 83. fig. 1. 



B. 6. D. 1/5. -A. 9. P. 1/5-6. 



The length of the head is one-fourth, or a little less than one- 

 fourth, of the total (without caudal) ; the eyes are situated before 

 the middle of the length of the head ; the maxillary barbels extend 

 to the root of the pectoral ; the free portion of the tail is twice as 

 long as high. Dorsal spine of moderate strength, a little shorter 

 than the head ; adipose fin longer than the dorsal, and equal in 

 length to its distance from the dorsal ; caudal forked. Yellow, with 

 four broad, irregular brown cross-bands ; fins and barbels variegated 

 with brown. 



Java. 



a. One of the typical specimens. From Dr. P. v. Bleeker's Collection. 



