1915. J NATURAL SCIENCES OF PHILADELPHIA. 267 



Also No. 39,931, A. N. S. P., paratype, same data. Head 3; depth 

 4|; D. I, 7; A. I, 4; lateral scutes 26 to caudal base and 2 more on 

 latter; snout If in head; eye 5|; mouth width 3; interorbital 2|; 

 length 103 mm. 



Related to P. auroguttatus (Kner). In that species the dorsal 

 spots are larger and ill-defined and the space between the ventrals 

 is mostly granular. Kner's figure shows the granules sparsely 

 irregular on the breast, whereas in the present species they are mostly 

 uniform. Other allied species, which agree in having the occipital 

 bordered by a single nuchal scute, are P. wuchereri Giinther and 

 P. unce Steindachner. The former has two series of spots on each 

 dorsal membrane and the region between the ventrals is naked or 

 with but few granules. In the latter species the scutes on the belly 

 are reduced to a minimum. P. lexi R. Von Ihering, P. variipidus 

 R. Von Ihering and P. ancistroides R. Von Ihering all differ in 

 coloration. 



(Named for the Rio Jaguribe.) 



Loricariichthys derbyi sp. nov. Fig. 4. 



Head, measured to hind edge of gill-opening 5|; depth 9|; D. 

 I, 7; A. I, 5; P. I, 6; V. I, 5; scales 31 in lateral series to caudal 

 base, lateral keels united or approximated after 19 scales; 22 scales 

 behind dorsal; 3 predorsal scales; head width ly^ in its length: 

 head depth at occiput 2|; snout If; eye 5; mouth width 4; inter- 

 orbital 3^; dorsal spine 1|; anal spine li; pectoral spine 1|; ven- 

 tral spine If. 



Body slender in profile, deepest at dorsal origin, and well depressed. 

 Caudal peduncle well depressed, long, and surfaces similarly widely 

 convex above and below. 



Head moderately long, depressed, broadly convex above and 

 more or less flattened below. Snout convex over surface, profile 

 also very slightly convex, and length about f greatest width opposite 

 front of eyes. Eye moderate, with eye-socket well notched behind, 

 general form ellipsoid, and center falls about last third in head 

 length. Mouth anterior or slightly before middle in snout length, 

 transverse, and jaws firm. Inner edge of each mandibular ramus 

 with 5 fine, slender teeth, close-set and uniserial. Upper jaw with 

 10 similar smaller, inconspicuous teeth. Buccal disk elongate, 

 hind edge and outer surface of lower lip entire, though front edge of 

 disk laterally and before each barbel fringed. Lateral barbel short, 

 about f in eye. Tongue broad, fleshy, apparently not free. Nostrils 

 together, within an aperture, but slightly less than eye length, also 



