EIGENMANN— YELLOW FEVER AND FISHES. 209 



It may be found a little farther north than Paita, but it is not found 

 as far north as Guayaquil, where its place is taken by a related 

 species. Phnelodella elongata (G.). The genus Pimelodella is very 

 widely distributed in South America " from Buenos Aires to Guiana 

 and Venezuela to the base of the Andes ; west of the Andes from 

 Peru to the Chagres River to Panama." I published a monograph of 

 the genus {"Pimelodella and Typhlohagrus," Mem. Carnegie Miis., 

 Pittsburgh, VII., No. 4, pp. 229-258, Plates XXI.-XXXV., 191 7) 

 with figures of most of the species. The Pimelodellas are small, 

 long-whiskered catfishes and not much is to be expected of their per- 

 formance as mosquito eradicators. 



2. The " tripon " is Curimatus peruanus E., a species recently 

 discovered by me at Sullana. As far as known, it occurs only in the 

 Chira River and at Chiclayo, where the yellow-fever commission 

 caught it. I did not get it at Pacasmayo, only a few miles farther 

 south. There are two other species of Curimatus in Guayaquil and 

 five more in Colombia. 



The genus is very widely distributed in the hot lowlands east of 

 the Andes. The species do not have teeth and nothing is to be ex- 

 pected of them as mosquito larva eaters. They seem to feed on 

 slime. There are 50 or more known species. I reviewed the group 

 of the toothless Characins to which the genus belongs in 1889 {A71- 

 nals N. Y. Acad. Sci, IV., pp. 1-32, 1889). 



3. The " cachuelo " is Bryconamericus peruanus (M. & T.), found 

 in all the streams between the Rimac and the Esmeraldas in Ecuador. 

 In the Rimac it occurs from sea level to over 7,000 feet elevation. 

 It should prove a valuable larva eater. A second species of the genus 

 is found at Guayaquil. North of Guayaquil, in Colombia, several 

 other species are abundant. The genus is widely distributed east of 

 the Andes. It is a member of the Tetragonopterinae of the Chara- 

 cidae. Among the Tetragonopterinae there should be many species 

 available for mosquito work. 



I found insect remains in the intestines of many of the species, 

 some of which seem to specialize in the insects naturally blown into 

 the river. The entire group of the Tetragonopterinae has been mono- 

 graphed. Most of the species have been figured. Three parts of the 



