XXXII. CHIROSTOMA 79 



on dorsal part of body edged with dark dots; jaws with dark dots; 

 upper part of eye black; the dark, pigmented arachnoid shows through 

 the skull." Fins all clear. 



124. Chirostoma grandocule (Steindachner), 1894.-^*- 



Atherinichthys GRANDOCULis (Steindachner) , ^W2. /4^ad. Wiss. Wien, 31, 149, 1894. 

 Chirostoma grandocule Steindachner, Denk. Akad. Wiss. Wien, 62, 525, pi. 2, 

 fig. 1, 1895; Jordan and Evermann, Bull. U. S. Nat. Mus., 47, pt. 3, 2839, 1898; 

 Meek, Publ. Field Mus. (Zool.), 3, 115, 1902 (in part) ; 5, 176, 1904 (in part). 

 Chirostoma grandoculis Regan, Biol. Centr.-Amer., Pisces, 61, 1907 (in part). 

 Type-locality. — Lake Patzcuaro. 

 Range. — Lake Patzcuaro, Mexico. 



As far as known, this species is confined to Lake Patzcuaro, the 

 specimens recorded by Meek from Lake Chapala representing a distinct 

 species, here described as C. consocium. For use in comparing the two 

 species, we add here the following measurements and counts of six 

 topotypes of C. grandocule, 79 to 82 mm. long to caudal. 



Depth of body, 5.2 to 5.5, length of head (including opercular mem- 

 brane), 3.5 to 3.75 ; length of eye, 3.8 to 4.1 ; snout, 3.4 to 3.5 ; mandible, 

 2.4 to 2.65 ; scales in the median longitudinal series, 60 to 72 ; in a trans- 

 verse series above anal origin, 16 to 19 ; in a series between origins of 

 dorsals, 9 to 12; dorsal rays, V-I, 11 or 12; anal, I, 18 to 21. 



125. Chirostoma promelas Jordan and Snyder, 1900.-^'' 

 (Plate VIII, Figs. 29, 30) 

 Chirostoma promelas Jordan and Snyder, Bull. U. S. Fish Comm., 19, 136, fig. 14, 

 1899 (1900) ; Jordan and Evermann, Bull. U. S. Nat. Mus., 47, pt. 4, 3160, 

 1900; Pellegrin, Bull. Mus. Hist. Nat. Paris, 7, 205, 1901; Evermann and 

 Goldsborough, Bull. U. S. Fish Comm.,21, 152, 1901 (1902) ; Meek, Publ. Field 

 Mus. (Zool.), 3, 115, 1902; 5, 177, 1904; Regan, Biol. Centr.-Amer., Pisces, 

 62, 1907. 

 Type-locality. — "Market of Guadalajara, Jalisco, Mexico; said to have come 

 from Laguna de Chapala." 

 Range. — Lake Chapala, Mexico. 



In C. PROMELAS, as in the other species of the genus, the lower 

 jaw is very strong; in this species alone, however, the premaxillaries 

 are so sharply and extensively produced forward, obviously as a secondary 

 variation, that they project beyond the mandibular symphysis. 



126. Chirostoma lucius Boulenger, 1900.'^*- 

 (Plate VIII, Fig. 31) 

 Chirostoma lucius Boulenger,- Ann. Mag. Nat. Hist. (7), 5, 54, 1900 (in part, 

 fide Regan); Jordan, Bull. U. S. Fish Comm., 19, 137, 1899 (1900) (foot- 

 note); Meek, Publ. Field Mus. (Zool.), 3, 115. 1902; 5, 178, fig. 60, 1904; 

 Regan, Biol. Centr.- Amer., Pisces, 62, 1907. 

 Type-locality. — Lake Chapala. 



