These butterflies not having a very powerful flight are generally confined to circumscribed localities, in which they are generally plentiful and easily collected. Their caterpillars are frequently social like those of the _Vanessæ_, preferring the family of Scrophalarineous plants, (_Scrophularia_ in California, _Linaria_ and _Veronica_ in Europe), but inclined more to polyphagy than the Argynnides, in their predilection for the Violarineae. Besides the Scrophalarineae the _Melitæae_ live on _Plantago_, _Lonicera_, _Scabiosa_, and some even are found on shrubby trees of _Salix_, _Populus_, and _Fagus_. Dr. Cooper presented a continuation of his descriptions of fishes: On new Genera and Species of Californian Fishes—No. II. BY J. G. COOPER, M. D. EXOCŒTUS, ARTEDI. E. CALIFORNICUS, Cooper, Californian Flying-Fish, State collection, species 1012. [FIG. 20.] [Illustration: FIG. 20.] _Specific characters._—Height of body one eighth of its length from tip of nose to fork of tail, length of head almost one fifth of the same (0·19). Width of forehead in front of eyes more than five eighths the length of head (0·69); diameter of eye less than one third of same length (0·30). Scale between eyes equilateral, and a little less than half of the width of head. No granulated area in front of orbit, and but a very narrow one behind it. Preoperculum rounded rectangular. Pectoral fin extending to halfway between end of dorsal and base of caudal, 0·60 of total length. Ventrals inserted nearer operculum than base of caudal, and extending to middle of anal. Dorsal commencing over 36th scale and extending to 48th. D. 12, P. 14, V. 6, A. 10, C. 3-1-4-5-1-6. Scales 58-7/1. _Colors._—Steel-blue, fins smoky, below silvery, iris gilt. _General form_ much elongated, subcylindrical. Top of head perfectly flat, its width equal to its depth. Anterior half of body nearly as broad as high, compressed above. Posterior half compressed laterally, tapering to tail, the caudal peduncle three times as high as it is broad. A slight ridge along insertion of dorsal. Lateral line prominent, running close to insertion of ventrals. Proportions of fins to total length, as follows: Length of dorsal 0·11 Height of ventrals 0·23 Length of anal 0·07 Length of caudal, upper lobe 0·15 Length of caudal, lower lobe 0·22 Height of pectoral 0·60 Length of specimen fifteen inches, the figure representing it half the natural size. One specimen obtained at Catalina Island.