SMERINTHUS HYBR. HYBRIDUS. 453 



and were apparently capable of copulation, but an apparent $ was 

 gynandromorphous, the genitalia containing the organs of both sexes. 

 Birchall notes {Rept. Brit. Assn., 1870, p. in) the rearing of 

 6 specimens — 3 <fT s, 2 ? s, and 1 gynandromorph. In spite of the 

 reputed general tendency to gynandromorphism in S. hybr. hybridus, 

 we find only the following described examples : 



a. Right side, g , ocellata ; left ? , populi. The right antenna <? , right 

 side presents the characters of S. ocellata the $ parent, whilst the left side is 

 ? and differs from an ordinary ? A. populi only by a little more brilliancy of 

 colour. The generative organs were much distorted, and there were no ova in 

 the abdomen (Birchall, Rept. Brit. Assn., 1870, p. in). The specimen passed 

 into Briggs' hands, who figured it (Ent., xiv., p. 217). 



j3. Right side s , left side ? . The right side inclining, both above and 

 below, more to -5". ocellata in coloration and markings, the left side more to 

 A. populi.. The ocellated spot on the right side larger with a broad black border, 

 the left one smaller, and more obsolete. Right antenna $ , left ? . Abdomen 

 without ova, left side distinctly stouter, and with the anal point rounded towards 

 the right, with a very distinct right anal clasp. Difference in wing expanse, 

 right side 36mm., left side 34mm. Bred in Wiesbaden. Wiskott coll. Breslau. 

 (Wiskoct, Festschrift. Schles. Ver. Ins., pp. 109 — no, pi. hi., fig. 8). 



y. Right side <? , left ? . Wings and antennae on the right side <? , on the 

 left side ? ; wings of the right side larger than those of the left. Abdomen 

 from its shape ? ; of the sexual organs only a c? anal clasp observable. The 

 outer ? genital organs are not discernible. Daub coll. Carlsruhe (Gauckler) 

 (Schultz, III. Woch. fur Ent., ii., p. 395). 



I — ?;. Four gynandromorphs in the Staudinger coll. Not described floe. cit.J. 



9. Apparently ? . The genitalia have the lobes similar to those of the 

 ? s of A. populi and S. ocellata, but, mixed up with them in the last segment, 

 are the rudimentary and partially developed organs of the <? , the whole apparatus 

 being much smaller than is that of the ? parent species. Immediately behind 

 are some curious structures which are apparently the rudimentary inferior harpes, 

 then there is one superior harpe, well-defined, but very small ; neither the uncus 

 nor the anal flap is separable, but no doubt both are present in some rudimentary 

 form ; the penis is very distinct ; it is rounded at the base, and consists of a short 

 tube, surmounted by a large number of very small spines. Farther back, near 

 the junction of the penultimate segment, is the ovipositor (?), scarcely smaller 

 than that of the parents (vide, Ent. Rec, x., pi. hi., fig. 7). Ova were also discovered 

 in the body. I should certainly say that this specimen was incapable of reproduction. 

 Bacot coll. (Pierce, Entom. Record, Sec, x., p. 189). 



Comparison with parent species and allies. — Bacot notes of 

 his $ S. hybridus that it is superficially more like the ? than^ parent, 

 though a close examination reveals the fact that in many faint but im- 

 portant markings it follows Smerinthus ocellata. The wings are narrower 

 than those of Amorpha populi, especially the secondaries, the notch at 

 the anal angle being very distinct. There are three dark patches on the 

 forevvings, two situated near each other towards the anal angle, whilst 

 the third is placed at about the middle of the outer transverse band. 

 These patches are of very general occurrence among the Amorphids, 

 being especially distinct, and evidently forming protective markings in 

 Sic/iia quercus, and some of the American and exotic species. They are 

 present in both S. ocellata and A. populi, strong and dark in the former, 

 faint only in the latter. In the hybrid, though they are scarcely so 

 strong as in S. ocellata, they appear to me to partake more of the 

 ancestral character. The hind tibiae of the hybrid moths possess two 

 spines only. The ocellated spot on the hindwing is rather lunular 

 than ocellated (Bacot). 



Egglaying. — Theegglaying habit must of necessity agree with that 

 of A morpha populi, the $ parent. Bacot notes a pairing on June 13th, 

 1896, between which date and the 19th, 163 eggs were laid by the ? . 



