240 PROCEEDINGS OF THE ACADEMY OF [Apr., 



side, and scales on each side with keel, which becomes obliterated 

 after second scale along dorsal base, and posteriorly till near middle 

 in length of caudal peduncle it forms only slight convexity on each 

 scale. Lateral keels on each side made up of minute serrse, straight 

 in their arrangement, and graduated longer to last, which largest. 

 Each lateral scale of belly Avith rather obsolete keel. Head all more 

 or less roughened with minute asperities, though slightly more 

 conspicuous along lower edge of snout. All fin spines and outer 

 rays of caudal finely spinescent. 



Dorsal origin fall's behind first third in length about an eye- 

 diameter, spine slender and not larger than longer rays. Anal 

 inserted well behind dorsal base, or slightly nearer snout tip than 

 caudal base, spine scarcely larger than rays, and depressed fin extends 

 2f to caudal base. Caudal small, median rays short, and outer or 

 upper and lower ones slightly enlarged. Pectoral reaches ventral, 

 spine flexuous, longer than rays. Ventral inserted slightly before 

 dorsal origin, spine long and flexuous, and reaches back about oppo- 

 site middle of third scale along anal ba'se. Vent about midway 

 between ventral and anal origins. 



Color in alcohol largely uniform brownish, apparently greatly 

 faded. Lower surface of body pale. Fins all pale, uniform, and 

 caudal with several pale irregular cross streaks. Iris dark. 



Length 180 mm. (caudal tips damaged). 



Type, No. 8,301, A. N. S. P. Ambyiacu River, Ecuador. John 

 Hauxwell. 



This example is close to Loricariichthys maculatus (Bloch), and 

 may ultimately be found identical. Bloch's poor figure-^ does not 

 show much detail fit for comparison, and the synonymous Loricaria 

 amazonica Castelnau^^ is not much better. The snout, in Ijoth cases, 

 is shown as more obtuse, similar to my examples of Loricariichthys 

 typus. From Regan's description, my specimen differs in the 

 longer snout and the abdomen with but a single series of plates 

 between the lateral series. The carinate anterior plates are also 

 characteristic, as his specimens are given at 190 mm. in length, and 

 said to have all the predorsal plates weakly carinate in the young 

 and without distinct keels in the adult. 



(Named for John Hauxwell, who collected fishes in the Ambyiacu 

 River many years ago.) 



2' Loricaria maculata Bloch, Naturg. Ausl. Fische, VIII, 1794, p. 73, PI. 375, 

 fig. 1. 

 22 Anim. Amer. Sud, 1855, p. 46, PI. 23, fig. 2. 



