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The antennae consist of elongated glandular protuberances, 

 rather irregular in shape and slightly dissimilar from one another, 

 the left one being more fully developed in its characters, so that the 

 following details have more especial reference to it. The cuticle 

 composing this left antenna may Ijo described as a series of more 

 or less imbricated segments, tliough without any visible articu- 

 lations, theannules being inflated, and retaining their form fairly 

 well ; the whole antenna is perfectly empty, and is somewhat 

 cluvate, or dilated at the point, which when looked at from above 

 appears to be cup-shajjcd. The sex of the insect is, I believe, 

 female. 



With regard to the cause of this singular abnormity, one or 

 two suggestions may be considered, and I shall be glad to hear 

 remarks respecting them from others more capable of forming an 

 opinion on the subject. 



I was at lirst inclined to think the peculiarity of the antennae 

 might be due to an abortion, in conjunction with a development 

 of glands similar in nature to those proper to the larvae of most 

 Fapilios ; but as those glands do not occur upon the head itself, 

 but on the first segment of the thorax, and, moreover, are 

 confluent at the base, the case does not appear to be an analagous 

 one. Whether these antennae were retractile or not, and whether 

 they had any fluid contents, I am unable to state. My corres- 

 pondent wondered whether the abnormity were due to either a 

 change of diet, or to the darkness of the box in which the pupa 

 was kept ; but I do not think eithei' circumstance would produce 

 an efl'ect of this nature. With respect lO th' .'ormer suggestion, 

 however, it may be worth while to add, that in answer to some 

 questions I put on the subject of food, Mr. Griffiths informed me 

 that during the three or four days of his experience with the 

 larva, he supplied it daily with three or four small leaves of 

 seedling marigolds, each measuring about two square inches in 

 area, and that it ate most of them, until the last day of its exis- 

 tence ; so that it consumed perhaps fifteen to twenty square 

 inches of the leaves during the time he had it. It was some ten 

 or eleven yards from any plant wlien he found it, but as it was 

 crawling away from the direction of a bed of marigolds, it maij 

 have come from them ; and as the larva took to the niarigold 

 leaves as a pabulum so readily, it is most probable, 1 think (in 

 accordance with the general princi[ile of set-feeding lately referred 



