i8 Carl L. Hubbs 



Pseudoxiphophorus bimaculatiis Woolman, Bull. U. S. Fish. Comm., 14, 1894, p. 

 65; Jordan and Evermann, Bull. U. S. Nat. Mus., 47, pt. i, 1896, p. 678; Meek, Publ. 

 Field Mus., Zool., 5, 1904, p. 127 (in part). 



Pseudoxiphophorus pauciradiafus Regan, Ann. Mag. Nat. Hist., (7) 13, 1904, 

 p. 256; (7) 16, 1905, p. 362. 



The pertinence of Mollienisia jonesii to the present genus and its approx- 

 imate identity with his own pauciradiatus has already been indicated by 

 Regan. 



The material of this form examined is part of that recorded by Woolman 

 (1894), as Pseudoxiphophorus himaculatus, from the Rio Blanco at Orizaba. 

 This is the type locality of paiiciradidtus. 



Pseudoxiphophorus himaculatus himaculatus Heckel 



Xiphophorns bimacuJatus Heckel, Sitz. Akad. Wiss. Wien, i, 1848, p. 296, pi. 9, 

 figs. I, 2. 



Pseudoxiphophorus himaculatus Bleeker, Ichth. Arch. Ind. Prodr., Cypr., 2, i860, 

 p. 485; Atl. Ichth., 3, 1863, p. 140,- Troschel, in Miiller's Reise Mexico, 3, App., 1865, 

 p. 104; Giinther, Cat. Fishes Brit. Mus., 6, 1866, p. 332; Garman, Mem. Mus. Comp. 

 Zool., 19, 1895, p. 81, pi. 3, 'fig. 6, and pi. 8, fig. 9; Bean, Proc. U. S. Nat. Mus., 21, 

 1898, p. 541; Meek, Publ. Field Mus., Zool., 3, 1902, p. 98; Regan, Ann. Mag. Nat. 

 Hist., (7) 13, 1904, p. 256; Meek, Publ. Field Mus., Zool., 5, 1904, p. 127 (in part) ; 

 Regan, Proc. Zool. Soc. London, 1913, p. 993, fig. 170C (in part) ; Cockerell, Proc. 

 Biol. Soc. Wash., 28, 1915, pp. 153, 156. 



Gambusia {Pseudoxiphophorus) bimaculata Regan, Ann. Mag. Nat. Hist., (7) 

 19, 1907, p. 260. 



Gambusia bimaculata Regan, Biol. Centr. Am., Pisces, 1907, p. 98 (in part). 



( ?) Poecilioides bimaculatus Steindachner, Sitzb. Akad. Wiss. Wien, 48, 1863, 

 p. 176, pi. 4, fig. 2; Troschel, in Miiller's Reise Mexico, 3, App. 1865, p. 104 (not 

 Xiphophorus bimaculatus Heckel). 



Pseudoxiphophorus rcticulatus Troschel, in Miiller's Reise Mexico, 3, App., 1865, 

 p. 104; Giinther, Cat. Fishes Brit. Mus., 6, 1866, p. 22>Z- 



The typical subspecies of Pseudoxiphophorus himaculatus inhabits the 

 streams back of Vera Cruz, chiefly at moderate elevations. 



In material collected by Meek the dorsal rays vary as indicated in the 

 following table: 



Frequency tabic. — Dorsal rays in Pseudoxipliopliorus bimaculatus bimaculatus: 



Dorsal rays 



J2 13 14 15 



San Francisco River basin at Xico and Jalapa i 24 9 2 



Blanco River basin at Cordoba i 10 I 



Papaloapan basin at Obispo, Perez and El Hule 4 . 2 



Pseudoxiphophorus himaculatus taeniatus Regan 



Pseudoxiphophorus bimaculatus Meek, Publ. Field Mus., Zool., 5, 1904, p. 127 (in 

 part); Regan, Ann. Mag. Nat. Hist., (7) 16, 1905, p. 363; Miller, Bull. Am. Mus. 

 Nat. Hist., 22,, 1907, p. 105 (in part?) ; Regan, Proc. Zool. Soc. London, 1913, p. 993, 

 fig. 170C (in part). 



Gambusia bimaculata Regan, Biol. Centr. Am., Pisces, 1907, p. 98 (in part). 



Pseudoxiphophorus bimaculatus var. taeniatus Regan, Ann. Mag. Nat. Hist., (7) 

 16, 1905, p. 363; Biol. Centr. Am., Pisces, 1907, p. 98, pi. 14, fig. 4. 



