322 MEMOIRS OV THK CARNEGIE MUSEUM. 



middle of the head, interoculur 3.5 to 4 in tlie lengtli of tlie head; the width of tlie 

 head equal to its length behind the nasal barbels. 



Nasal barbels about reaching the tip of the opei-cular spines, the maxillary 

 barbels sometimes to the axil; first pectoral ray with its filament about equal to the 

 length of the head, the rays equal to the length of the eye and postorbital portion 

 of the head or a little longer ; origin of the ventrals equidistant from the base of the 

 middle caudal rays and some point in the basal half of the pectorals, their tips 

 reaching the vent in the young, falling short in the adult; origin of anal under the 

 middle of the dorsal, the distance between the base of the last ray and the base of 

 the middle caudal ray five to five and one-half in the length; caudal rounded, six in 

 the length; origin of the dorsal over some point in the last half of the ventrals, 

 equidistant between tip of caudal and middle of pectorals or a little farther forward, 

 its distance from the base of the middle caudal rays 1.8-2.2 in the length. 



Sides and back spotted, the spots usually confluent into a narrow median lateral 

 band and into a narrow band above and below the median band. The very young 

 with a narrow black lateral band without other markings. 



The above description aiiplies particularly to the types and some of the speci- 

 mens between Honda and Facatativa, Nos. 7113, 7114, 7106, and some specimens 

 from Santander, No. 7105. 



From these typical specimens the following variations were noted. In the 

 specimens from Villeta, No. 7108, also on the line between Honda and Facatativa, 

 the caudal is truncate with rounded outer edges, the origin of the dorsal is equi- 

 distant between the tii) of the caudal and the opcrcle or a little farther forward. 

 Some of these specimens are more distinctly spotted than the typical striatum, 

 approaching P. banneaui. 



In the six'cimens from Guaduas, also along the line between Honda and 

 Facatativa, and in those from San Gil, No. 7109, the position of the dorsal agrees 

 with its position in those from Villeta, /. c, it is in front of the typical position. In 

 these, the most conspicuous marking is a black lateral band in which the spots are 

 not recognizable. In some of those from San Gil, the band above the median band 

 is also prominent, but it can sometimes be seen that both it and the median band 

 are made up of series of spots. A small specimen from Chamisal, No. 13831, is 

 nearly like them. The origin of the dorsal is median between the tip of the caudal 

 and the base of the opercular spines, the barbel extends nearly to the middle of the 

 pectoral; a narrow black lateral stripe, otherwise plain light. 



The specimens from La Ropera are more profusely covered with small spots, 

 their longitudinal arrangement inconspicuous. 



