Mr. E. Doubleday on some Lepidoptei^a. 385 



the latter, consisting on each side of an internal, larger, auiiform 

 labyrinthic gill, and an external, small, almost biscuit-shaped one ; 

 on the gill-arches there is moreover a discoid, shortly peduncu- 

 lated piece of cartilage, but which is situated apart from the cavity 

 of the above organ. A simple swimming-bladder. Stomach sacci- 

 form, and the simply coiled intestine has at its commencement a 

 single rudimentary caecum. 



Ctenopoma multispinis, Peters. PI. XI. fig. 3. 



Form of the body extended ; anal fin more than half as long as 

 the dorsal fin, both furnished with elongated soft rays which 

 form an acute posterior angle to these fins. Foramina exist in 

 the infraorbital bones, as also laterally below the inferior maxilla. 

 Two larger scales above and at the base of the pectoral fin. 

 B.6; D. 17, 9; V. 1, 5; A. 10, 9; P. 14; C. 14—15. Colour 

 dark green above, becoming yellowish below. The body is co- 

 vered with dark spots in two-thirds of its breadth, as are also the 

 dorsal and caudal fins. Length 3 inches. 



EXPLANATION OF PLATE XL 



Fig. 3. Animal of the natural size. 



Fiff. 4. a, Interior large labyrinthic gill ; b, exterior small labyrinthic gill ; 

 c, discoid petiolated accessory organ. 



XLII. — Descriptions of new or imperfectly described Lepidopterous 

 Insects. By Edward Doubleday, Esq., F.L.S., Assistant in 

 the Zoological Department of the British Museum, &c. 



[Continued from p. 176.] 



Fam. PIERID^. 



Genus Euterpe. 



Eut. Dysoni. Alls omnibus supra nigris : maris fascia lata trans- 

 versa alba : feminm basi alba : marginibus externis albo maculatis ; 

 subtus nigro, brunneo, alboque variegatis ; posticarum basi coc • 

 cinea. Exp. alar. 2\ unc. vel 57 mill. 



Hub. Venezuela. 



Anterior wings elongate, trigonate, somewhat truncate at the 

 apex, the outer margin sinuate, dentate. Above, in the male, 

 black, with a transverse white band, commencing near the costa 

 beyond the cell, macular at its origin, widening towards the inner 

 margin, dentate externally; between this band and the outer 

 margin is a series of four or five whitish dots ; cilia fuscous. 

 Posterior wings with the anterior margin deeply emarginate near 

 the base, the outer margin sinuate, dentate, the tooth in which 



