392 BRITISH LEPIDOPTERA. 



d'autres individus, par la teinte brun clair de cette raeme tache, s'eloignent a peine 

 de la S. tiliae. La coloration generale varie beaucoup d'un individu a un autre. 

 Les tons gris verdatre, ou gris brun, sont la regie chez le peu d'individus obtenus 

 jusqu'ici. Le coloris ne passe au brun rouge que chez un seul exemplaire. De 

 meme la couleur des ailes posterieures en dessus varie sensiblement, entre le brun 

 clair et le gris brun fonce. L'envergure moyenne des ailes n'est guere que de 60 mill, 

 tout au plus, elle est done sensiblement plus petite que celle de la S. tiliae, laquelle 

 atteint pies de 70 mill. Les ailes de ces hybrides ne se developpent souvent pas du 

 tout, d'autres fois seulement ties imparfaitement, et meme, chez les individus les 

 mieux formes, il se presente frequemment, ca et la, de petites lacunes au b'ord externe 

 des ailes " (Standfuss, Bull. Soc. Ent. Br., 1901, p. 86). 



2. Calasvmbolus hybr. interfaunus, Neum. (astylus g x ocellata ? ). — The 

 imagines look remarkably alike, and are nearly all of the normal large size of -5*. 

 ocellata, measuring from 67mm. — 73mm. across the wings. The shape of the 

 primaries is more of the peculiar cut of Calasymbolus astylus on an enlarged scale, 

 while the secondaries are those of S. ocellata with less dentation of outer margin 

 near the anal angle. The following characters are uniform in all examples : A 

 large, brown, thoracic central stripe from head to body, as in astylus. Entire 

 absence of the scalloped outer margin of primaries so prominent in ocellata. Only 

 faint traces of discal spot ; transverse lines on primaries much less undulated than in 

 ocellata, and the basal space of the triangular appearance of that of astylus, formed 

 by the diagonal line from basal part of costa joining marginal dash on submedian. 

 Coloration of primaries a mixture of ocellata and astylus, with a fresh rosy hue 

 prevailing. Secondaries light chestnut, with basal area of light rose ; the ocellated spot, 

 although smaller than in ocellata, is about twice the size of that of astylus, with a 

 heavy black rim and centre. Below, both wings as in ocellata, with the entire 

 absence of discal dot in primaries. Abdomen light chestnut, with an overcast 

 of light rose; 12 $ examples (Neumoegen). 



Pupae of S. ocellata imported from Germany by Rix, of New 

 York, disclosed, among others, in 1893, a $ which was tied to a 

 twig of syringa to see whether she would attract an American 

 " beau." The next morning a $ Calasymbolus (Paonias*) astylus was 

 found in copulation with her. The eggs, which she afterwards laid 

 were fertile, and many of the larvae from them pupated in the autumn 

 of 1893. In the summer of 1894, 25 $ s emerged, whilst some 

 20 more apparently healthy pupae, went over a second winter 

 (Entom. News, v., p. 326). 



3. Smerinthus hybr. hybridust, Stphs. {ocellata s x populi ? ). — Five 

 examples, 4 $ s, 1 ? . — They are almost perfectly intermediate between the two 

 species. The forewings have all the characters of both species, the basal line 

 as in A. populi, but with distinct traces of a shade, showing the angulation of the 

 basal line seen in S. ocellata, the hindwings have the fulvous basal patch of A. populi 

 (no red colour) and indistinct eye-spot, characteristic of S. ocellata. Ova laid May 

 31st, 1890, larvae appeared in due course and pupated between July 20th — 27th. 

 Ten imagines appeared three weeks later (Tutt, Ent. Rec, i., p. 203). 



Standfuss observes {Handbucli, etc., p. 54) that this hybrid 

 has repeatedly been bred in captivity in many places, and has 

 also been observed in a state of nature in Schilling, Saarau, Silesia ; 

 according to outward appearance, this cross results in an intermediate 

 between the two species, the blind grey-blue ocellated spot strongly 

 suggesting, on superficial examination, S. ocellata, but in the form 

 of the wing coming much nearer A. populi; the extremely rare 

 ? s of this hybrid have the ocellated spot, as a rule, very ill- 

 developed, sometimes almost entirely wanting, so that this sex 

 reminds one more of A. populi ; the $ of this hybrid is said to 



* The type of the genus Paonias was fixed as ocellata by Stephens in 1850, 

 and therefore falls as a synonym of Smerinthus. Calasymbolus had astylus fixed 

 as type by Grote, in 1874, and must stand for this species. 



f Treated at length later in the volume (see postea). 



