272 ME. C. TATE REGAN ON THE 



4 times in the length of head ; median abdominal plates 



extending anteriorly to level of middle of gill-opening . . 8. L. magdalena Stdr. 

 Breadth of body at level of first anal ray 4* times in the distance 



from that point to the caudal; first dorsal ray as long 



as the head; interorbital width 4§ times in the length 



of head ; median abdominal plates extending anteriorly to 



posterior edge of coracoid 9. L. cadece Hensl. 



Breadth of body at level of first anal ray nearly 6 times in the 



distance from that point to the caudal ; first dorsal ray 1-1- 



times the length of head 10. L. teffeana Stdr. 



/3. Scutes in front of dorsal all distinctly carinate. 

 Breadth of head l-§— 1J times in its length; abdominal plates in 3 



or 4 series between the posterior plates of the lateral series, 



in 5 or 6 between the middle ones, still more numerous 



anteriorly 11. L. catamarcensis Berg. 



Breadth of head 1| times in its length; abdominal plates in 3 series 



between the lateral series for nearly their whole extent ; first 



dorsal ray longer than the head, the length of which is 4| 



times in the total length (in a specimen of 108 mm.) . . . 12. L. konopickyi Stdr. 

 Breadth of head 1J times in its length ; abdominal plates in 3 



series between the lateral series for nearly their whole extent; 



first dorsal ray shorter than the head, the length of which is 



4|-4§ times in the total length (in specimens of 190 mm.) . 13. L. steindachneri Rgn. 

 Breadth of head 1^-1-1- times in its length; abdominal plates in 



3 series between the last 4 of the lateral series, anteriorly 



more numerous 14. L. lima Kner. 



d. Abdominal plates in 5 or 6 series between the posterior plates of the lateral series, 

 anteriorly more numerous ; 29 scutes in a longitudinal series (? upper caudal ray 

 elougate) . 

 Breadth of head 1^ times in its length ; anal plate bordered ante- 

 riorly by 3; pectoral spine extending to base of ventral . . 15. L. strigilata Hensl. 

 Breadth of head 1\ times in its length; anal plate bordered ante- 

 riorly by 5; pectoral spine extending to anterior |-of ventral. 16. L. microlepidog aster Rgn. 



B. Abdomen naked anteriorly, covered by a group of 



rather large plates in its posterior half 17. L. latirostris Blgr. 



II. Upper lip narrow, with marginal fringes for its whole extent; lower lip broad or moderately 

 so, in great part covered with very small papilla?, posteriorly smooth, the margin entire 

 or slightly fringed; barbel not longer than diameter of eye; teeth in equal number in 

 both upper and lower jaw, 10-12 on each side; a more or less distinct enlarged anal 

 plate ; head without keels or ridges. (Pseudoloricaria Blkr.) 

 34-35 scutes in a longitudinal series ; anal plate bordered ante- 

 riorly by several .... 18. L. Imviuscula C. & V. 



30 scutes in a longitudinal series ; anal plate bordered anteriorly 



by 4 19. L. punctata Rgn. 



