1899.] NATURAL SCIENCES OF PHILADELPHIA. 353 



orange spots arranged longitudinally. Posterior margins of scales 

 peppered with dark dots. Upper half of pectoral dark. Ventrals 

 pale. Axil dark. 

 Habitat. — Peru. 



63. Archoscion altipinnis (Steindachner). 



Ancylodon altipinnis Steindachner, Ichthy. Notizen, iii, 2, plate 1, 

 fig. 2, 18G6 [" West Coast of South America"]. 



ArcJioscion analis Jordan and Eigenmann, Rep. U. S. F. C, '86, 353, 

 1889 [Callao]. 



Although there are no specimens of this species in the Beardslee 

 collection, yet a careful comparison of Steindachner' s description 

 and plate, with examples of C. analis, indicate conclusively that it 

 is distinct from Jenyn's species. In analis the interdorsal space is 

 large, as long as eye, and the two dorsals are not connected. In 

 altipinnis the two fins are connected by a low membrane and are 

 presumably close together (distance equal to pupil, Jor. and Eig. ). 



The eye is somewhat smaller in analis, being 6 in head to 5 in 

 altipinnis; the snout is longer, 3^ in head to 4^ in altipinnis, and 

 the depth in the former rather less, 4| in body; while Steindachner 

 gives 4^. The most important difference seems to lie in the lack of 

 developed opercular spines in analis, while the other species has two 

 quite strong spines. 



Habitat. — Peru, perhaps extending southward. 



64. Archoscion peruanus (Tschudi). 



OtoUthus per nanus Tschudi, Fauna Peruana, Ichthy., 10, 1845. 



This species, which is very closely related to C. analis, is known 

 only from the original description. It appears to differ from analis 

 in having the second dorsal equidistant from snout and caudal and 

 hardly separated from the first dorsal, while in analis the two fins 

 are widely separated and the second is considerably nearer caudal 

 than snout. The ventrals are longer in peruanus, reaching past 

 pectorals, while in the former species the pectorals are considerably 

 longer. 



Following is Tschudi' s original description: 



" D. 8-22. A. 15. V. 5. P. 18. 



' ' Verhliltuiss der Hohe zur Lange 1:4, 8, des Kopf es zum 



Korper 1:2, 5. Auge breiter als hoch, steht 1, 6 seines Quer- 



durchmessers von der Schnauzeuspitze und viermal seiuen 



Querdurchmesser vom obern Dorn des Vordeckels, einhalbmal 



23 



