138 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. VII. 



Molienisia fasc-iata Mtiller & Troschel, Mon. Akad. Wiss., Berlin, 



1844, 36, Mexico. 

 Gawibusia modesta Troschel, Miiller's Reise in Mexico, iii, 639, 1865, 



Mexico. 



Pcecilia mexicana Steindachner, Sitzber. Akad. Wiss., Wein, 1863, 

 178, Southern Mexico: Gunther, Cat., vi, 340, 1866, Chiapam; 

 Duenas; River Choisoy, Vera Paz; Lake Amatitlan : Jordan & 

 Evermann, 1. c. 692: B. A. Bean, Proc. U. S. Nat. Mus., 1898, 

 Santa Maria, Vera Cruz. 

 Poecilia' thermalis* Steindachner, Akad. Wiss., Wein, 1863, 181, 



Warm springs in Central America. 

 Pcecilia chisoyensis Gunther, Cat., vi, 342, 1866, River Choisoy, 



Vera Paz: Jordan & Evermann, 1. c., 693. 

 Pcecilia petenensis Gunther, Cat., vi, 342, Lake Peten: Jordan & 



Evermann, 1. c., 694. 



Pcecilia dovii Gunther, Cat., vi, 344, 1866, Lake Nicaragua; Lake 

 of Amatitlan: Gill & Bransford, Proc. Acad. Nat. Sci. Phila., 

 1877, 183 : Jordan & Evermann, 1. c., 695. 



Pcecilia limantouri Jordan & Snyder, Bull. U. S. Fish Comm., 1900, 

 129, fig. 10, Rio Tamesin, Tampico: Jordan & Evermann, 1. c., 

 1900, 3153: Fowler, Proc. Acad. Nat. Sci. Phila., 1903, 320, 

 Victoria, Tamaulipas. 



Pcecilia butleri Jordan, Proc. U. S. Nat. Mus., 1888, 330, Rio Pre- 

 sidio, near Mazatlan: Jordan & Evermann, 1. c., 691: Ever- 

 mann & Goldsborough, Bull. U. S. Fish Comm., 1902, 151, Salt 

 water in Gulf of Tehauntepec, Salina Cruz: Meek, Field Col. Mus. 

 Pub., Zool. Ser., v., 151, 1904. 



This species is extremely variable, and is widely distributed. It is 

 found in salt, brackish and fresh water, its vertical range is from sea 

 level to over 6000 feet in Guatemala. Where found it is extremely 

 abundant. It occurs in low, stagnant pools to swift mountain 

 streams. This species is often reported to live in hot springs, and to 

 exist in water near the boiling point. At Laguna, on Lake Amatitlan, 

 are a number of hot springs at the water's edge. The discharge from 

 these springs forms a rather thin layer of hot water on the surface for a 

 distance of about 1 5 meters from the spring. As these fishes approach 

 within a meter or so of the spring they have the appearance of swim- 

 ming in very hot water. The temperature of the water on the surface 

 is scalding hot, while the stratum below is less than 90 F. It is in this 



*The specimens from San Salvador, warm springs, recorded, by Dr. Gunther 

 (Cat., vi, 341, 1866) under this name have been made the basis of a new 

 species, Pcecilia salvatoris (Ann. & Mag. Xat. Hist., 1907, 65) by Mr. Regan. 



