HYLES EUPHORBIA. 203 



Ins., 2, t. ii De Geer, Ins., i., t. 8, f. 6-n. Uddm., Diss., 57. 

 Habitat in Euphorbia, Galio (Linne, Sys. Nat., xth. ed., p. 492). [In 

 the xiith. ed., p. 802, "flava" is changed to "pallida" and " pur- 

 purascente" to " rubra," whilst Linne' further adds : " Alas superiores, 

 basi angustatae ; puncto nigro, in medio disci, minimo ; vitta longi- 

 tudinalis ex tribus coadunata. Inferiores supra disco rubro, lineis 

 nigris divisa."] 



Imago. — 70mm. — 82mm. Thorax olive, with white lateral line 

 from front to end of thorax, passing through base of antennae and along 

 edge of wings; abdomen olive, banded superiorly with black and 

 white towards thorax, but with slender intersegmental white bands 

 only towards anus \ a broad unbroken longitudinal median band of 

 ground-colour. Anterior wings olive, with the median area and outer 

 margin pale ochreous-grey, leaving the ground-colour to form a 

 wedge-shaped fascia from apex to inner margin, a basal patch, a 

 discoidal patch and a small costal patch nearer apex, the three 

 last-mentioned united by a narrow costal streak of ground-colour ; 

 basal patch of white scales, an inner marginal basal black patch 

 just below ; inner margin edged with a fringe of white scales ; 

 fringes of outer margin unicolorous with outer area ot wing. Posterior 

 wings red, with a black basal patch and somewhat narrow black 

 submarginal band ; anal area white ; fringes white. 



Sexual dimorphism. — The $ is decidedly larger than the $ . 

 This appears to be so at any rate in any set of specimens supposed 

 to be of the same origin, but the individual variations are so great 

 that one cannot with confidence say more than that it appears to 

 be so. The antennas appear to vary from 11 mm. to 13mm. in the 

 $ , and from 10mm. — 12mm. in the ? s, but the average difference 

 for specimens of equal size of each sex is nearer i^mm. than romm, 

 The ? antenna looks very decidedly more slender basally than 

 that of the $ , and, therefore, more clubbed. This seems to be 

 partly actually the case, more a result of the hair-pockets of the $ 

 antenna giving it a more uniform appearance than it really possesses. 

 The 2 is more robust and carries the greater width for four or 

 five abdominal segments, whilst that of the $ tapers almost from the 

 base. The first tibial spur is longer in the $ , 2*omm. to i'6mm. in the 

 9 ; the comb is better developed, but not more than in proportion to 

 the larger spur. The abdominal fan is very small, arising from the 

 usual position, viz., an offset of the ventral abdominal plate immediately 

 below the first (second ?) abdominal spiracle, it arises from a minute 

 area, about ^mm. long and '07 mm. wide, and is so small that one says 

 at first view it contains perhaps two dozen hairs, actually it 

 contains about 100, the hairs are yellow-brown and about 2mm. 

 long, the pocket-like fold containing it extends down through the 

 following segment and is well-developed (Chapman). 



Gynandromorphism. — The only gynandromorph of which we 

 can find any record is the following : 



a. Left side $ , right side ? . Left wings smaller ; the body perceptibly 

 divided by a median line, the left side green, the right reddish ; palpi and legs 

 white; the abdomen female (Germar, Ahr. Fn. Eur., fasc. I, tab. xxvi ; Rudolphi, 

 p. 53 ; Burm., p. 340 ; Hagen, S.E.Z., xxii., p. 271). 



Variation. — The variation of this species is highly interesting 

 and suggestive. Not only is there an abundance of minor aberrational 



