1915.] NATURAL SCIENCES OF PHILADELPHIA. 269 



outer or upper and lower enlarged, especially former, which con- 

 spicuously compressed and osseous. Pectoral reaches ventral, spine 

 rather flexuous at tip, equals longest rays. Ventral inserted slightly 

 before dorsal origin, spine long and flexuous, and extends back 

 slightly beyond front of anal. Vent slightly nearer ventral than 

 anal origin. 



Color in alcohol dull brownish above, mottled obscurely with 

 dark towards upper lateral regions. Lower surface of body immacu- 

 late whitish. Fins pale brownish, rays and spines all rather finely 

 spotted dusky. Several dusky spots along side of head. Iris slaty. 



Length 175 mm. (caudal tip damaged). 



Type, No. 39,932, A. N. S. P. Rio Jaguribe at Barro Alto, Brazil. 

 November, 1913. Mr. C. F. Derby. 



Also No. 39,933, A. N. S. P., paratype same data. Head 5^; 

 depth 9; D. I, 7; A. I, 5; scales 31 to caudal base and 1 more on 

 latter; scales approximated after first 19; snout If in head; eye 

 4f; mouth width 4; interorbital 3f; length 150 mm. (caudal tip 

 damaged). 



This species appears to be related to Loricaria spixii Steindachner, 

 which differs in having the lateral keels approximated after the 

 twenty-third scale, fewer scales in transverse series across the belly, 

 and in the nasal sockets not extending into the anterior interorbital 

 region. From most all other species L. derhyi differs in the en- 

 larged uppermost caudal ray. 



(Named for Mr. C. F. Derby.) 



Lebistes reticulatua (Peters). 



Three examples 15 to 30 mm. They all show a blackish ocellus 

 on side of back just before dorsal fin. The largest example also 

 has about a dozen vertical streaks made up of the darker olive 

 ground-color and a dusky streak transversely over dorsal near base. 

 These examples were obtained near the coast. 

 Tropidurus torquatus (Wied). 



One example, 187 mm. 



