274 ME. C. TATE REGAN ON THE 



c. Teeth in the upper jaw stronger and fewer than in the lower, 3 or 4 in the upper, 6-8 

 in the lower on each side. 

 a. Abdomen covered by 3-5 series of plates between the lateral series. 

 Head 1^- times as long as broad, its lower surface entirely naked . 30. L. cataphracla L. 

 Head \\ times as long as broad, its lower surface entirely naked . 31. L. carinata Casteln. 

 Head 14 times as long as broad, its lower surface with a patch 

 of small granular plates on each side in front of the gill- 

 opening 32. L. simillima Rgn. 



/3. Abdomen with or without very small granular plates, sometimes wholly or partially 

 naked. 

 33-34 scutes in a longitudinal series ; pectoral spine extending 

 beyond middle of ventral (in the adult) ; breadth of body at 

 level of first anal ray nearly 4 times in the distance from that 



point to the caudal 33. L. apeltogaster Blgr. 



33-34 scutes in a longitudinal series ; pectoral spine extending to 

 anterior £ of ventral (in the adult) ; breadth of body at level 

 of first anal ray 3i times in the distance from that point to 



the caudal 34. L. macrodon Kner. 



36-37 scutes in a longitudinal series 35. L. vetula C. & V. 



B. Snout obtuse. 



a. Abdomen naked except for the lateral series of plates 



and a median strip of rather small plates ; 30-32 



scutes in a longitudinal series 36. L. variegata Stdr. 



b. Abdomen entirely covered with plates. 



Head If times as long as broad ; abdomen covered with small 



plates 37. L. macromystax Gthr. 



Head a little longer than broad; abdomen covered with small 



plates ; a lateral series of 8-10 plates between pectoral and 



ventral ; lower surface of head with a group of small plates 



in front of each gill-opening 38. L. lamina Gthr. 



Head as broad as long ; abdomen covered with small plates ; a 



lateral series of 6-7 plates between pectoral and ventral ; 



no group of plates in front of the gill-opening 39. L. laticeps Rgn. 



Head as broad as long; abdomen covered by a few large plates, 



in 1 series between the lateral series, which consist of 4 plates 



on each side 40. L. platycephala Kuer. 



1. LORICARIA FILAMENTOSA. 

 Loricaria jilamentosa Steind. Denkschr. Ak. Wien, xxxix. 1878, p. 45, pi. ix., and xlii. 1880, p. 65. 



Length of head 5-5J times in the total length. Breadth of head I3— 1^ times in its 

 length, diameter of eye 6-7 times, interorbital width 4-5 times, length of snout twice. 

 Sides of the head, in the male, swollen, armed with short spiny bristles. Supraorbital 

 edges moderately raised ; orbital notch equal to about § the diameter of eye ; supra- 

 occipital with one or a pair of serrated keels ; lips papillose, with short marginal 



