LEMSTES. 355 



the middle of the side ; a black line along the lower margin of the 

 tail. Fins of uniform colour. (Oirard.) 

 Rio Santa Cruz (Mexico). 



9. Oirardinus sonoriensis. 

 Gtrard, Proc. Acad. Nat. Sc. Fhilad. 1859, p. 120. 

 D. 8. A. 8. y. 6. 

 Very similar to O. occidentalis. Length of the head about one- 

 fifth of the total (with the caudal), Dark chestnut-brown, with a 

 more or less conspicuous black lateral band ; a dark line along the 

 lower margin of the tail. (Girard.) 



San Bernardino Creek (Mexico). Probably identical with O. occi- 

 dentalis. 



10. Girardinus decemmacnlatus. 



Poecilia decemmaculata, Jenyns, Voy. Beagle^ Fish. p. 115, pi. 22. 



fig. 1. , 



? Poecilia gracilis, Cuv. 8; Val. xviii. p. 133. 



D. 8. A. 10. V. 6. L. lat. 30. L. traosv. 9. 



The height of the body is somewhat more than the length of the 

 head, which is not quite one-fourth of the total (without caudal) ; 

 the diameter of the eye is much more than the length of the snout, 

 one- third of the length of the head, and equal to the width of the 

 interorbital space. In the female (which sex only is known), the 

 origin of the dorsal fin is nearer to the extremity of the snout than 

 to that of the caudal, and but little behind that of the anal. Caudal 

 fin large, as long as the head, slightly rounded behind. The free 

 portion of the tail elongate. A series of about ten irregular blackish 

 spots, smaller than the ej'^e, runs along the middle of the side ; a black 

 line along the lower and upper margins of the tail. 



Maldonado (Uruguay). 

 a. One of the typical specimens, 1 inch long. Voyage of the 

 * Beagle.' 



Appendix to the Cyprinodontidos. 



LEBISTES. 



Lebistes, De Filippi, Arch, per la Zool. VAnat. S)C. 1862, i. p. 69. 



Cleft of the month small, with the lower jaw projecting beyond 

 the upper, both jaws with a narrow band of very smaU teeth, those 

 in the outer series being the largest. Scales of moderate size. Dor- 

 sal and anal fins short; anal in advance of the dorsal, with the 

 second and third rays much thickened and elongate in both sexes. 

 The second ventral ray is the longest, and [in the females, termi- 

 nating in a hook?]*. 



Island of Barbadoes. 



If the characters assigned to this very doubtful genus are correct, 



* According to the figure, in the. male! 



2 A 2 



