$68 Annals of the Carnegie Museum. 



Snout and interorbital space less than the diameter of the eye. 

 No. 2826a-&, 7 and 9 cm., Villa Bella, Rio Beni, Bolivia. 



D. XV, 10; A. Ill, 9; depth 2.25; head 3.25; eye 3; snout 2.16; 



tS 

 scales 6-29-13; eight gill-rakers; pores in lateral line ; indistinct 



cross-bands; caudal distinctly emarginate. 



No. 2827, 10 cm., Bastos, Rio Alegre of Guapore, June 26, 1909. 



73. Geophagus gymnogenys Hensel. 



G. hrachynrus Cope partim, G. camurus Cope. 

 No. 28030-^, II and 12 cm., and a lot of young fish which came out 



of the mouth of some older one, Porto Alegre, Rio Grande do Sul, 



Jan. 22, 1909. 



Depth 2.66; head 3.33; snout 2.2; scales nearly all gone from the 

 cheeks (excepting parts of two or three rows) ; eight gill-rakers on lower 

 anterior arch, pectorals longer than the head, reaching to the anal 

 spines; the males with swollen heads. 

 No. 28o4fl-c, 10.8-11.5 cm., Porto Alegre, Jan. 24 and 27, 1909. 



D. XIII or XIV; A. Ill, 8; depth 2.6; head 3+; eye about 4; 

 scales 4-29-9. 

 No. 25050-7, 7-10 cm., Porto Alegre, Jan. 20, 1909. 



The females are always less highly colored. 

 No. 28060-m, 3-9.7 cm., Porto Alegre, Jan. 21, 1909. 

 No. 28070-^, two females, 5.7 and 7 cm., and some young, Cachoeira, 



Rio Grande do Sul, from Rio Jacuhy. Jan. 27, 1909, 



The young ones were seen entering the mouth of an adult, which 

 upon removal from the water ejected them. This same specimen 

 has six complete rows of scales on the cheeks, and the loss of scales 

 cannot be associated with the breeding season. 

 No. 28080-c, 2.8-8.3 cm., Cachoeira, Rio Grande do Sul, Rio Jacuhy, 



Jan. 29, 1909. 



These specimens also have five or six rows of scales on the cheeks. 

 If there are no scales their absence is due to the death of the fish be- 

 fore it was placed in alcohol. Those which were put into alcohol alive 

 have scales, while those taken from the market always had few or 

 no scales on the cheeks. 



No. 28oga-d, 3-6 cm., Uruguayana, Rio Uruguay. 

 No. 2Sioa-q, 4-7 cm., Cacequy, Rio Ibicuhy, Rio Grande do Sul, 



Feb. 2, 1909. 



These specimens (both sexes) are more slender and much less colored 



