EDWIN CHAPIN STARKS 35 



The head, measured to the end of the temporal plate, is contained 3}i 

 times in the length to the caudal. It is wider than in related species, and 

 rapidly tapers, as viewed from above, to a point half way between the eyes 

 and the tip of the snout, thence the taper is scarcely perceptible to the 

 slightly expanded tip of the snout. The length of the snout is contained 

 4^ times in the entire length to the caudal. Opposite the eyes the depth of 

 the head is contained Ifi times in its width. The surface of the head and 

 snout are everywhere finely granular, with the granulations not bristle-like 

 or otherwise differentiated at the side. The teeth of the upper jaw are 

 long and slender, hooked inwards, their points flattened and unevenly divided 

 into two or three unequal cusps. There are at least 24 of them on each 

 side of the jaw. The diameter of the eye is contained 14 times in the 

 length of the head ; 3 times in the interorbital ; once in the space to the 

 anterior nostril; and 1^ times in the space to the upper end of the gill 

 opening. 



The breast has a median series of plates; the one between the ventrals 

 and just in front of the vent is enlarged. At the vent a lateral plate 

 extends entirely across the body and is pierced by the vent. Directly behind 

 it is the last median ventral plate. Seven plates are in the median series 

 between the occipital plate and the dorsal. The same number of lower 

 lateral plates are between the pectoral and ventral. 



The pectoral is contained 2% times in the head, and reaches a diameter 

 of the eye past the front of the ventral. The ventral is contained 3^ 

 times in the head, and does not reach to the anal. The anal has 6 rays, 

 is inserted behind the front of the dorsal and reaches a trifle past it. Its 

 first ray is contained l}i times in the head. The caudal lobes are produced. 



A conspicuous dark band, about twice the diameter of the eye at its 

 widest part, runs from the tip of the snout to the caudal. The entire snout 

 is dark and the color parts into the lateral band of each side where the 

 snout grows broad. The band thence curves upward, surrounding the eye, 

 and arches backward, following the contour of the back. It follows along 

 the side of the caudal peduncle with a round white spot at the posterior 

 edge of each plate, and divides on the caudal fin in a black stripe along 

 each lobe near the edge. The other fins are colorless, and except the 

 ventral, have round dusky spots on the first two or three rays. 



This species is related to Farlowella gladius and F. gracilis, but differ 

 as shown in the appended table. Of the only other two species with a 

 median series of ventral plates F. kneri has a much blunter, shorter, and 

 wider snout, and a much larger eye, while F. oxyrhynchus has the post- 

 dorsal part of the body much shorter as compared with the predorsal part. 



