558 Mr. G. A. Boulenger on Fishes 



lower part of anterior arch. Dorsal I 6, 1 j to Ij as distant 

 from root of caudal as from end of snout ; spine strong, 

 feebly serrated behind, f length of head ; fir.-t and second 

 soft rays longest, as long as head, reaching or nearly 

 reaching adipose fin Avhen folded ; adipose fin as long as 

 base of rayed dorsal, ^ as long as its distance from latter. 

 Anal 13, 9 rays branched. Pectoral shorter than head, 

 spine strongly serrated on inner side. Caudal deeply 

 forked, -oitli long pointed lobes^ middle rays I length of 

 longest. Caudal peduncle Ij to H times as long as deep. 

 Olive-brown above, white beneath ; fins olive-brown. 



Two specimens, measuring 85 and 160 mm. respectively, 

 from the Bengo River at Dondo. 



Closely allied to C. furcatus, Gthr. ; distinguished by 

 longer barbels. 



Named in memory of the late Prof. Barboza du Bocage, 

 who so largely contributed to our knowledge of the Zoology 

 of Angola. 



40. Chrysichthys ansorgii, sp. n. 



Depth of body 4i to 5 times in total length, length of 

 head 3^ to 3| times. Head rather strongly depressed, 

 \l to 1| times as long as broad, its upper surface smooth, 

 covered with thick skin; occipital process narrow, extending 

 to the small interneural shield ; snout rounded ; eye 3^ 

 (young) to 5 times in length of head, 1 (young) to 2 times 

 in interocular width ; mouth inferior, its width 1^ to 1^ 

 times in length of head (narrower in young) ; prseraaxillary 

 band of teeth straight or feebly curved, 4 times as long as 

 broad ; voraero-pterygoid teeth forming a stronjr and long 

 band, narrowly interrupted in the middle ; nasal barbel as 

 long as eye^ maxillary f to ^ length of head (as long as 

 head in very young), outer mandibular \ to ^, inner 

 mandibular \ to i. Gill-rakers rather long, 1-3-15 on 

 lower part of anterior arch. Dorsal 16, \\ to 1^ times as 

 distant from end of snout as from root of caudal ; spine 

 strong, feebly seriated behind, | to | length of head ; second 

 or third soft ray longest, i to | length of head ; adipose 

 fin as long as or a little shorter than base of rayed dorsal, 

 ^ to ^ as long as its distance from latter. Anal 13, 8 or 9 

 rays branched. Pectoral much shorter than head, spine 

 strongly serrated on inner side. Caudal moderately forked, 

 the lobes tbtusely pointed in the adult, middle rays | to \ 

 length of longest. Caudal peduncle \\ times as long as 

 deep. Olive-brown or grey to blackish above, white 

 beneath j fins olive-brown. 



