302 Annals of the Carnegie Museum. 



anus; eight plates between occiput and dorsal; central membranes of 

 caudal hyaline, the rays spotted, outer rays prolonged, spotted, the 

 first or first and second membrane within the lower ray and the two 

 to five rays and membranes within the uppermost rays black, the 

 black interrupted near the middle by a narrow extension of the median 

 hyaline and with a few hyaline spots in the black distad to the median 

 interruption; rays of all other fins spotted. 



8. Farlowella amazona Giinther. 



C. M. No. 3784, one, 188 mm., Santarem, Dec. 6, 1909. J. D. Hase- 



man. 



Head to end of opercle three and nine-tenths in the length; distance 

 of occipital from dorsal six and one-fifth in the length; width of head 

 four times in its length; diameter of eye sixteen times in head; inter- 

 orbital a very little less than five times in the head; produced part of 

 snout two and three-quarter times in the distance from tip of snout to 

 anus; seven scutes between occipital and dorsal. Each caudal lobe 

 with an interrupted dark stripe. 



9. Farlowella gladiolus Giinther. 



C. M. No. 3755, two, 3755a, 141 mm., 3755^, 181 mm., Rio Tapajos, 



Dec. 6, 1909. Haseman. 



Length of produced part of snout (from naked area about mouth to 

 tip of snout) two and one-half times in the distance from the tip of 

 snout to anus in 37550, two and three-eighth times in 3755^; head to 

 end of occipital three and one-third in the length in 37550, two and- 

 two-fifth times in 37556; head to end of opercle three and three-fifth 

 times in the length in 3755a, three and two-fifth times in 37556. 

 Distance between occipital and dorsal six and one-fifth in both speci- 

 mens: interorbital about one-sixth of length of head; seven plates 

 between occipital and dorsal in 3755a, six in 37556; a median plate in 

 front of ventrals; eye eighteen times in length of head to end of opercle 

 in 37556, sixteen times in 3755a. Four series of plates between 

 naked area of snout and the median plate between the pectorals; 

 three plates in each series, not counting the marginal ones. 



