358 On a nevi Locariid Fish. 



XL. — Description of a new Loricariid Fish of the Genus 

 Plecostomus/row Argentina. By C. Tate Regan, M.A. 



Plecostomus tceniatus, sp. n. 



Deptli of body 5 to 5£ in the length, length of head 3§ to 

 3?. Head as broad as long and If as long as deep. Diameter 

 of eye 8 to 9 in the length of head, inteiorbital width 2f , 

 length of snout 1£. Length of mandibular ramus 2 in the 

 inteiorbital width ; 30 to 36 teeth on each side in both jaws. 

 Barbel about £ the diameter of eye. Snout broad, obtuse ; 

 supraorbital edges not raised; temporal plates not keeled; 

 supraoccipital without median ridge, bordered posteriorly by 

 4 or 5 scutes ; occipital process short. Scutes spinulose, not 

 carinate, 31 in a longitudinal series, 8 between dorsal and 

 adipose fin, 15orlG between anal and caudal. Lower surface 

 of head and abdomen covered with small granular scales. 

 Dorsal I 7, the first ray a little longer than the head and 

 when laid back extending to the fifth scute behind the last 

 ray, which is a little more than \ as long as the first. Length 

 of base of dorsal equal to its distance from posterior end of 

 spine of adipose fin. Anal I 4. Pectoral spine extending to 

 anterior J of pelvic fin. Caudal emarginate, the middle rays 

 nearly f as long as the longest. Caudal peduncle 3£ as long 

 as deep. Head with numerous small dark spots; sides of 

 body witli three or four dark longitudinal stripes, each occu- 

 pying the upper and lower parts of adjacent series of scutes; 

 dorsal and paired fins with some dark spots ; caudal dusky. 



Bab. Rio La Plata. 



Two specimens, 2G0 mm. in total length, received for 

 di termination from the Berlin Museum. One of these has 

 been retained for the British Museum Collection. 



XLI. — Descriptions of new Fishes from Lake Candidius, 

 Formosa, collected by Dr. A. Moltrecht. By C. Tate 

 Regan, M.A. 



Gymnostomus labiatus. 



Depth of body equal to the length of head, 4 in the length 

 of the fish. Snout not projecting beyond the upper lip, 

 nearly as long as the postorbital part of head. Diameter of 



