1913.] NATURAL SCIENCES OF PHILADELPHIA. 579 



€nd of maxillary pale brownish streak, narrower than pupil in width 

 and also with pale lower border. Opercle and cheek brownish. 

 Predorsal scales, and those on back above 1. 1., with pale brownish 

 lengthwise streaks over or between upper and lower boundaries of 

 scale exposures. Back with eight dusky-brown saddles, gradually 

 smaller until only evident as viewed from above at caudal peduncle, 

 though four extend slightly below course of upper 1. 1. Ill-defined 

 ■dusky streak along middle of side, extends to caudal base medianly, 

 marked with six dusky-brown large blotches through its extent, 

 and these alternating with dorsal saddles. At caudal base median 

 lateral band reflected out on median caudal rays. Iris slaty, though 

 traversed by dark band from snout. Dorsals grayish, spinous 

 fin very obscurely mottled sparsely with paler, and on rayed fin 

 5 or 6 transverse broad whitish streaks form. Caudal, except as 

 noted, pale, with several series of dark spots on membranes, most 

 distinct within dark area distally extending from lateral streak. 

 Other fins all pale grayish. 



Length 68 mm. 



Type, No. 39,315, A. N. S. P. Igarape de Candelaria, tributary 

 of the Madeira River, approximately two miles distant in Lat. S. 

 8° 45', W. Long., 63° 54', Brazil. September, 1912. Edgar A. 

 Smith. 



Only the type obtained. It is related to Mquidens tetramerus 

 (Heckel), in the 4 series of scales on the cheek, and scaleless preopercle, 

 characters shared equally with ^. rivulatus (Giinther) and ^. geayi 

 (Pellegrin). It differs from all, however, in coloration. 



(Named for the Madeira River.) 



TETRODONTID^ . 



-ColomeSUS psittaCUS (Schneider). 



Three small examples from the Madeira River about 200 miles 

 .east of W. Long. 63° 54', Brazil. September, 1912. 



