Freshioater Fishes from Angola. 459 



eyelid not much developed ; maxillary not quite extending 

 to below atiterior border of eye ; length of lower border of 

 second suborbital equalling diameter of eye. Gill-rakers 

 moderately long, 20 on lower part of anterior arch. Dorsal 

 II 7, originating above ventralsand at equal distance between 

 anterior border of eye and root of caudal. Anal III 14. 

 Pectoral fin a little shorter than head, nearly reaching 

 ventral. Caudal forked. Caudal peduncle twice as long as 

 deep. Scales 30 *!, 2 between lateral line and ventral. 

 Olive above, silvery beneath ; a black spot on the caudal 

 peduncle, extending on the median caudal rays. 



Total length 70 mm. 



A single specimen from the Quanza River. 



Most nearly related to A. linberi^ Peters. Distinguished 

 by a more elongate body with a greater number of scales in 

 the lateral line. 



Mastacemhelus Ansorgii. 



Depth of body 26 times in total length, length of head 8| 

 times. Vent halfway between end of snout and root of 

 caudal. Rostral appendage trifid and as long as the eye, 

 which is 3^V times in length of snout ; cleft of mouth extending 

 to below centre of eye ; no praiorbital spine ; prajoperculuni 

 ■with two or three strong spines. Dorsal XXXIV 128, anal 

 II 120, both confluent with caudal, which is rounded ; the 

 distance between the first dorsal spine and the head is 3 

 times in the length of the latter. Pectoral i length of head. 

 20 scales between the origin of the soft dorsal and the lateral 

 line. Olive-brown above, yellow beneath, with dark brown 

 spots and marblings ; three series of large spots on the back, 

 the lateral series confluent into a wavy band on the tail; 

 below these spots a straight band along the body, disappearing 

 a little in advance of the vent ; a band on each side of the 

 head, and a vertical bar below the eye ; fins yellow, with 

 dark brown spots and oblique streaks. 



Total length 445 mm. 



A single specimen from the Quanza River. 



The nearest ally of this new species is M. marmoratus, 

 Perugia, from the Congo. 



This is the first Mastacemhelus recorded from south of the 

 Conso. 



31* 



