Pnbl. 20. IV. 1913. HYBRIDS OF SPHINGID/E. By Dr. P. Denso. 265 



and walteri, is but very slightly indicated. Hardly any traces of the atavistic line *) preserved. — Only ob- 

 tained in captivity. 



C. f. (hybr.) turatii Denso (Celerio euphoribiae euphorbiae L. ^ x Celerio euphorbiae mauritanica Stgr. $). turatii. 

 This might easily be mistaken for an only slightly aberrant eupJiorbiae from a southern district, were its descent 

 from f. turatii not established with certainty by the copulation in captivity. The costal margin of the fore- 

 wing is only slightly suffused with olive-green, so that the middle and outer costal spots are distinctly pro- 

 minent. The colour of the very broad central and marginal areas is yellowish pink. The oblique line, the 

 first two-thirds of wliich are very narrow, becomes broad at the hind margm. — Only obtained in captivity. 



B. Primary Hybrids. 



C. hybr. kindervateri A'ysefa (43 a) (Celerio euphorbiae euphorbiae L. (^ x Celerio galliigallii Bott.'^). Costal kinderva- 

 margm broadly olive-green as in gallii, but the small basal accessory spot which in gallii is especially strongly '«''*• 

 marked is separated from the costal border and is well developed. The central costal spot is as m gallii, 

 the outer one obsolete. The shape of the olive-green oblique band — which m gallii is very broad at the 

 hind margin and projects far basad, and also is always strongly concave in its second third, then curving 

 off convexly to the hind margin — more nearly approaches that of euphorbiae, the concavity being absent. 

 The atavistic marginal line running from the apex to the hind angle, which is nearly always present in gallii 

 but rarely in euphorbiae, is distinct. Hindwing with strongly black base and broad black submarginal band, 

 disc of the same deeji red as in euphorbiae , only slightly lighter from the costal margin. Head, thorax and ab- 

 domen olive-green, the dorsal luie only slightly indicated, the last abdominal segments also only faintly edg- 

 ed with white. Antennae slightly tinged with olive-green and with a white tij). Underside of wings very like 

 gallii, but slightly suffused with yellow-red. Tarsi with a very small pulvillus. ■ — Larva very variable, rarely 

 with 2 rows of lateral spots, the upper row often reddish. — Obtained in captivity, also found in nature. 



C. hybr. epilobii B(h. (Celerio euphorbiae euphorbiae L. ^ x Celerio vespertilio Esp. $). Hybr. epi- epilohii. 

 lobii and the inverse hybrid densoi resemble each other very closely, so that if one has no exact information as 

 to the parentage of a specimen, one might be doubtful to which of the two forms it belongs. But in compar- 

 ing a large number of the moths the characteristic differences are quite distinctly recognizable. They are as 

 follows: In epilobii the ground-colour is less dusted with grey atoms, the markings, easily recognized as being 

 those of euphorbiae, are fairly distinctly coloured dull olive-green. The hindwing bears a well-developed 

 anal spot. The black submarginal line also well-defined and varying in size and position. Specimens of epi- 

 lobii suffused with red are also found, corresponding to the red forms of euphorbiae; they are named ab. ru- rubella. 

 bella Kysela. A rare form with greyish black instead of olive-green markmg.s and light grey gi'ound-colour 

 may be called ab. nigrescens ab. nov. ■ — Larva excedingly variable, with one or two rows of lateral spots. Horn niyrcscens. 

 short. — Obtained in captivity. Found in nature near Grenoble, Geneva, S. Tyrol, Hiiningen in Alsace, Vienna. 



C. hybr. euphaes Denso (43 a) (Celerio euphorbiae euphorbiae L. i^ x Celerio hippopluies hippophaes euphaes. 

 Esp.) $ (hybr. pauli ]\Iory [ ? ]). Specimens obtained from a copula euphorbiae (J x hippophaes ? in captivity pauli. 

 differ from hybr. pauli Mory in many respects. The moth which Mory believed to be hybr. euphorbiae x 

 hippophaes and described as hybr. pauli was obtained from a ^vild larva found in the Valais on Hippophae 

 rhamnoides. The hybrids obtained in captivity from the copula euphorbiae (^ x hippophaes $ have a narrow 

 dark olive-green costal margin. The basal costal spot, which is more rounded, a.s in euphorbiae, and not pointed 

 as it is in hippophaes, is also dark olive. The lower black basal spot placed below it is very small. The middle 

 costal spot, an indistinct smear in hippophaes, is definitely bounded, and the black spot at the cross-vein, very 

 sharply marked in hippophaes, is also distinctly j^resent. The outer costal spot is only slightly indicated. 

 The median area is broad, yellowish brown. The oblique band is convex taken as a whole, and never curves 

 distinctly towards the hind margin as in euphorbiae, its distal edge being sharply defined and dentate. The 

 black basal spot of the hindwing is separate from the submarginal band and smaller than in hippophaes, where 

 it is united along the costal margin with the black submarginal band, the latter having a diffuse inner edge. 

 The oblique band has a sharply defined proximal edge, pauli is distinguished by a much broader costal mar- 

 gui on the forewing, by the basal spot not being round but angular as in hippophaes, by the absence of the 

 dot at the cross-vein and by bearing a very distinct middle costal spot. Moreover, the median area is 

 very light, whitish grey. The oblique band runs as in euphorbiae, is sharply defined distally and the veins 

 traversing it are dusted with white. As to the hindwing, in pauli the basal spot and submarginal band are 

 united, and the latter has an mdistinct edge. It should also be mentioned that the larva of euphorbiae (J 



*) Of. foot-uote p. 264. 



II 34 



