336 MEMOIRS OF THE CARNEGIE MUSEUM. 



middle caudal rays one and sixty-seven hundredths in the distance between its 

 origin and the snout. 



Sides and back profusely covered with confluent spots, which leave the light 

 color as irregular vermiculations. 



58. Pygidium alternatum Eigenmann. (Plate LII, fig. 3.) 

 Pygidium alternatum Eigenmann, Proc. Am. Philos. Soc, LVI, Jan., 1918, p. 700. 

 Pygidium brasiliensis Eigenmann & Eigenmann (partim), Proc. Cal. Acad. Sci. 



(2), II, 1889, p. 51; id. (partim), Occasional Papers Cal. Acad. Sci., I, 1890, p. 



332; Ribeiro (partim), Fauna Brasiliensis, IV (A), 1912, p. 223. 



Habitat. — Rio Doce. 



It is possible that the young specimens of P. brasiliensis mentioned by Eigen- 

 mann & Eigenmann belong to this species. 



7079, C. M., type ami paratypes, sixty-seven, largest 81 mm. Rio Doce, May 25, 

 1908. Haseman. 



7080, C. M., eleven, largest 49 mm. Rio Doce, May 25, 1908. Haseman. 

 7601a, C. M., 26 mm. Jacarehy, July 15, 1908. Haseman. 



Head 5-5.5; D. 10.5-11.5; A. 7.5 or 8.5 counting the rudimentary rays ; P. 7 or 

 8; eye in middle of the head or slightly farther forward; interocular 3-3.33 in the 

 length of the head. Teeth conic, in bands. 



Nasal barbel very little shorter than maxillary barbel, which reaches to the 

 base of the pectoral and is as long as the head ; pectoral rays equal to length of head 

 behind the nasal barbels, the first ray with the filament longer than the head; 

 ventrals reaching to, or just beyond, vent; origin of ventrals equidistant from base 

 of middle caudal rays and a point between the posterior nares and the area just 

 behind the eyes; origin of anal under posterior part of dorsal; distance between base 

 of last anal ray and middle caudal rays four and a half to five and a third in the 

 length; caudal subtruncate or rounded, very little longer than head; origin of dorsal 

 over posterior half of ventrals; distance between origin of dorsal and base of middle 

 caudal rays 1.54 in its distance from the snout. 



Ten to fourteen large spots along the middle of the sides, an irregular series 

 of much smaller ones below it. Large spots above the median series, frequently 

 alternating with it, sometimes partly confluent into a longitudinal series, some- 

 times forming with a mid-dorsal series irregular bars across the back. 



As the specimens, No. 7079, ranging up to 81 mm., are essentially alike in color 

 and entirely different from the specimens of both smaller and larger size (74-120 

 mm.) from the same place referred to P. brasiliense, No. 7075, they have been 



