210 EIGENMANN— YELLOW FEVER AND FISHES. 



monograph have been issued, the fourth is in press (Mem. Mus. 

 Comp. Zoology, XLVII., Cambridge, Mass., 1917, 1918, 1921). 



4. The " mojarra " is Acquidens rimdatus (G.) of the CichHdse. 

 The family is abundant from Texas south. There are seventeen dif- 

 ferent species of the family between Pacasmayo and Panama. Only 

 the present species is found in Peru. I found it very abundant in 

 pools in the river bed at Piura and in the Jequetepeque River. It is 

 a very active fish with the habits and general appearance of some of 

 our North American sunfishes. 



Additional specimens of fishes used in Guayaquil in yellow-fever 

 work were received early in June, 1922, from Dr. W. Pareja, Di- 

 rector de Sanidad, Guayaquil. 



Part of my letter of June 5, 1922, to Dr. Pareja follows: "I 

 hasten to inform you that the ' millones ' are Acanthophacelus reticu- 

 latus (Peters). These little fishes are native in Barbadoes, Trinidad, 

 and along the coast streams of Guiana and Venezuela. They have 

 been widely distributed for mosquito work. 



"The 'chatas' are Astyanax festce (Boulenger). This fish has 

 only been taken in the Chone, Portoviejo and the Guayas basins, all 

 in Ecuador. 



" The ' brejas ' belong to two species : (a) Curimatus troscheli G. 

 is a lowland fish found only in the Guayas basin and reaches a length 

 of 203 mm. {b) Prochilodus humeralis G. is similarly confined to 

 the Guayas and reaches 280 mm. Other species of the genus Prochi- 

 lodus called ' boca chica ' are found in countless millions in the Atrato 

 and Magdalena rivers of Colombia and all through the east from the 

 ocean to 3,000 feet. They grow to a considerable size (390 mm.) 

 and are dried and sold to the laborers of Colombia for food." 



This account may well be closed with an extract from a letter 

 received from Dr. Hanson, mentioned above. It is dated June 9, 

 1922: 



" It appears that the fact that the ' life ' is an effective larvae con- 

 sumer is well established by the fact that in the Province of Santa 

 we did nothing except distribute fish in all containers, and did not 

 attempt to throw out or filter any of the water which contained great 



