Fishes of the Western North Atlantic 



2\C) 



and Demerara rivers, British Guiana. It is recorded for La Brea Beach, Trinidad, 

 and for Cano de Guanoco, Venezuela, without comment by Fowler (see reference 

 below). Fresh water seems to be its chief habitat. 



S}'nonyms and References: 



Stolephorus guianensis Eigenmann, Mem. Carneg. Mus., 5, 1912: 447, pi. 62, fig. 5 (orig. descr.; type local. 

 Bartica Rocks, British Guiana; type in CM; paratypes from Morawhanna and Demerara rivers, Brit. 

 Guiana). 



Anchoviella guianensis Fowler, Proc. Acad. nat. Sci. Philad., 5j, 193 1 : 392, 406 (La Brea Beach, Trinidad, and 

 Cario de Guanoco, Venezuela); Hildebrand, Bull. Bingham oceanogr. Coll., 5(2), 1943: 122, fig. 52 

 (synon., descr., relation.); Schultz, Proc. U. S. nat. Mus., 99, 1949: 48 (refs.). 



Anckovia brevirostris Pearson (not of Giinther), Indiana Univ. Stud., 11 (64), 1924: 50 (two immatures, 30 

 and 37 mm, lU 17354, now in CAS, rec. from Lake Rogagua, Bolivia; cf. paratype of Stolephorus 

 guianensis Eigenmann by Myers and found to be that species). 



Amflova guianensis Myers, Proc. Calif. Acad. Sci., (4) 2J, 1940: 440 (descr., exam, specimens from Mo- 

 rawhanna [paratype]; Lagoa Grande, lower Amazon, near Obidas, Brazil; and Lake "Rogoagua," 

 Bolivia; those from last mentioned place are the ones ident. as A. brevirostris by Pearson; see above). 



Anchoviella alleni (Myers) 1940 



Study Material. The holotype and 6 paratypes, 80-84 "ir" TL, from Peruvian 

 Amazon drainage system; the holotype and 4 paratypes in CAS, 2 paratypes in 

 USNM. 



Distinctive Characters. This species is close to A. guianensis, from which it differs in 

 having a somewhat smaller eye, a shorter anal base, a shorter and broader cheek, a 

 longer axillary scale on the pectoral, and in color. 



Description. Proportional dimensions in per cent of standard length, and counts, 

 based on the type material noted above, 80—84 "^"^ TL. 



Body: depth 18.8-20. 

 Head: length 22.7-25. 

 Snout: length 3.4—4.2. 

 Eye: diameter 5.5—6.25. 

 Postorbital: distance 11. 3- 12 

 Maxillary : length 1 1 . 8 — 1 3 . 

 Mandible: length 1 2.7-1 3.2. 



Anal fin: length of base 13.3— 15. 

 Pectoral fin: length 14.7— 16.5. 



Scales: ca. 44—46. 



Gill rakers: 16—18+23—26. 



Fin rays: dorsal 14 or 15; anal 18 or 19; 



pectoral 12 or 13. 

 Vertebrae: 42 (i specimen). 



Body slender, moderately robust, its depth 5.0—5.3 in SL. Head 4.0—4.4 in SL, its 

 depth only slightly less than its postorbital length and eye. Snout projecting about 

 half of its length beyond mandible, 5.5-6.0 in head. Eye 3.7-4.1 in head, 1.9-2. i in 

 postorbital part of head. Postorbital 1.9—2.0 in head. Maxillary slightly expanded 

 and rounded distally, extending as much as diameter of pupil bevond posterior rim of 

 orbit, failing to reach joint of mandible by about half of diameter of pupil, 1.7—2.0 in 



