HYBRIDS OF SPHINGID^. By Dr. P. Denso. 267 



vistic line, running from the outer costal spot to the hind margin almost pai'allel with the oblique band, is 

 strongly developed, the area between it and the oblique band is 3'ellowish pink and strongly narrowed in its 

 hindmarginal portion on account of the olive-green oblique band projecting towards the base at the hind 

 margin. The inner edge of the oblique band shows distinctly the concavity derived from gallii. The mar- 

 ghial area greyish lilac, often with traces of the Ime from apex to hind margin. The black discocellular 

 spot is present. The hindwing bears a broad black base and a yellowish pink band almost imperceptibly lighter 

 at the anal angle. The submarginal band is greyish black, diffuse, on the inner side often slightly edged with 

 olive; being so broad, the dull pink marginal area is very narrow. Thorax olive-green with reddish hair 

 on the patagia. Antennae nearly white, very faintly suffused with olive. Abdomen olive-green, with one 

 pair of black lateral spots. Segmental incisions laterally bearing a few hairs, pink and yellow in colour. 

 The underside of the wings is a perfect mixture of gallii and elpenor, but the black hairs on the basal area 

 of the forewing, derived from elpenor, are very strongly developed. — As yet only obtained in captivity. 



C. hybr. densoi MuscJmmp (43 b) {Celerio vespertilio Esp. ^ x Celerio euphorbiae euphorbiae L. $). densoi. 

 Compared with euphorbiae, hybr. densoi is conspicuous in that the ground-colour of the forewing is verv strongly 

 dusted with grey, so that on the whole it presents a darker appearance than liybr. epilobii. The dark grey 

 oblique band runs almost as in euphorbiae, the costal spots are also distinct, but the outer one is usually much 

 less developed than in epilobii. The atavistic line rumiing from the outer costal spot to the hhid margin al- 

 most parallel to the oblique band appears in nearly every specimen as an indistinctly bounded black-brown 

 stripe. The marginal area is of the same dark colour as the median area, the latter being much more rarely 

 lighter at the inner edge of the oblique band than in epilobii. The red colour of the hindwing is more like 

 that of vespertilio, the black submarginal band is broad and stands close to the outer margm. In very rare cases 

 the third pair of black abdominal lateral spots derived from vespertilio is present. Specimens with reddish ground- 

 colour, such as also occur in epilobii, may be named f. rubescens form. nov. It is known that specimens of den- rubescens. 

 sot occur with a salmon-coloured band on the hhidwing, having the same colour as Celerio vespertilio t. 

 salmoneaOberth. We may unite these also under the name f. salmonea form. nov. Very rare specimens with chrome- i;atmonea. 

 yellow band on the hindwing have been named f . reisleitneri by Kysela. Larva usually with two rows of sub- reisleiineri. 

 dorsal spots, the upper ones reddish. Horn very short. — Often obtained in captivity. Its occurence in 

 nature is not yet established beyond doubt. 



C. hybr. vespophaes Denso (Celerio vespertilio Esp. (^ x Celerio hippophaes hippophaes Esp. $). Mar- vespophaes. 

 kings very like those of hippophaes, but the costal margin much broader and darker, at the median area 

 very gradually merging into a lighter colour, which colour is only slightly marked. Oblique band less distinct 

 than in hippophaes, general colouring more grey, much darker than in vespertilioides. — Found in nature. — 

 Larvae obtained in captivity closely resemble vespertilio in ground-colour. The subdorsal spots of the anterior 

 segments are absent, the others small, pink, those of the caudal segment best developed. On the anterior 

 segments there are traces of the subdorsal lines. Horn short, straight. 



C. hybr. vespelpenor Denso (Celerio vespettilio Esp. ^ x Pergesa elpenor elpenor L. $). In this remark- vespelpenor. 

 able moth we meet with the same scheme of markings which is found in all hybrids derived from elpenor, 

 but the markings are naturally very indistinct. The broad costal border, the atavistic Ime, running from 

 the outer costal spot to the hind margin almost parallel to the inner edge of the oblique band, and the oblique 

 band are dark greyish green-olive in colour, the basal, median and marginal areas show slight traces of pink 

 scalmg. The hindwing has a very broad black base, upon which follows the dull pink transverse band, with a 

 slightly suffused submarginal band gradually disappearing anally and not leaving any room for a marginal area. 

 Head, thorax and abdomen also dull green olive, at the edges of the patagia sparse reddish hairs. Only one 

 pair of black lateral abdominal spots. Underside similar to that of vespertilio, but with a pair of dark olive- 

 green transverse lines derived from elpenor. 



C. hybr. hippophorbiae Denso (43 d) (Celerio hippophaes hippophaes Esp. ^ x Celerio euphorbiae hippophor- 

 euphorbiae L. $). Costal border less broad than in hippophaes and also more greenish. Basal spot not project- ''**'^* 

 ing so far as in hippophaes, and without the jioint of the latter. Lower basal spot smaller than in hippophaes, 

 but larger than in the inverse hybrid. Central costal spot in the form of a smear as in hippophaes, but more 

 strongly developed. The black dot at the discocellular vein is distinctly present, but the outer costal spot is 

 entirely absent. The yellowisli grey median area is lighter and yellowish pink along the inner edge of the ob- 

 lique band, as is often the case in hippophaes. The oblique band runs as m hippophaes, but is steeper in front 

 of the hind margin. Its distal edge is diffuse as in hippophaes. On the hmdwing the large black basal 

 spot is united at the costal margin with the diffuse-edged broad submarginal line. The transverse band is 

 bright red, the marginal band, however, is light pink. The underside of the wings is like that of hippo- 

 phaes, but it is of a deeper red, and the marginal areas of the wings are not grey, but reddish lilac. — 

 Larva usually with two rows of lateral spots, the lower spots being very small, and with a red dorsal line and 

 reddish yellow stigmatical one. — Only obtained in captivity. 



