274 MR. 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. cataphracta L. 
Head 1} times as long as broad, its lower surface entirely naked. 31. ZL. carinata Casteln. 
Head 1} times as long as broad, its lower surface with a patch 
of small granular plates on each side in front of the gill- 
Cat oe A oe Sas |) Aer tc in koce 
8. 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 
pointtothe caudal . . . .. =... +. « « - . . Sd LD, apelfogaster Bier. 
33-34 scutes in a longitudinal series ; pectoral spine extending to 
anterior 3 of ventral (in the adult) ; breadth of body at level 
of first anal ray 3} times in the distance from that point to 
fhe‘candal” oe. sepa -mestans * Jet eee eer.) te) O40 2s. macrodon kner: 
36-37 scutes in a longitudinal series . . . . ... =. =. . 85. L.vetulaC. & 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 . . . . . . . 86. LZ. variegata Stdr. 
6. Abdomen entirely covered with plates. 
Head 1? times as long as broad; abdomen covered with small 
platesi. =. = ; . 37. L. macromystax Gthr. 
Head a little longer Sitch =e atanntan contra with sie 
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 . . ere . 38. L. lamina Gthr. 
Head as broad as long; abdomen veda with ial Erikieate 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 
onmeach side. . . . « . «Seen: |.) . AO aiveenne ee 
1. LORICARIA FILAMENTOSA. 
Loricaria jilamentosa Steind. Denkschr. Ak. Wien, xxxix. 1878, p. 45, pl. ix., and xlii. 1880, p. 65. 
Length of head 5-5} times in the total length. Breadth of head 14-14 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 
am mei +a 
