220 Dr. Fritz Miiller's Notes on 



■which I lately caught I perceived a faint agreeable odour 

 on opening the pouch. 



Family 5. HESPERIDiE. 



The Hesperidce agree with moths in many particulars, 

 which are not to be found in any other butterflies. Thus, 

 as in many moths, the tibise of the hind legs are provided 

 in the males of various species Avith a large pencil of long 

 hairs. It can be hidden in a furrow on the ventral side 

 of the body, between thorax and abdomen. In Flesio- 

 neura Elir/ius, and in a species of Achb/odes, I jierceived 

 a very faint odour issuing from the pencils when they were 

 expanding. 



MO THS. 



In butterflies, as Ave have seen, the odoriferous organs 

 of the males in most cases are developed on the Avings ; in 

 but few genera [Dtma'is, L?/corea, Ituna, Morpho, Bihlis) 

 they Avere found on the abdomen, and, in some Ilesperidce, 

 on the hind legs. With moths the case appears to be 

 very different. Though not Avanting on the Avings, these 

 organs seem to occupy much more frequently the abdomen 

 or legs. 



A musk-like odour is knoAvn to be produced by several 

 male sphinx moths ; I have observed it in Macrosilia 

 Antceus and tAvo other species. It is emitted by tAvo 

 pencils of pale hairs on the ventral side of the abdomen, 

 Avhich can be hidden in longitudinal grooves on the first 

 two abdominal segments. To see them in the living male 

 he must be held Avith the ventral side turned upAvavd, so 

 that he can freely move his Avings. As soon as he begins 

 to flutter, the pencils Avill expand, and Avhen the Avings 

 cease to move, they Avill be laid doAvn again into their 

 grooves. 



The males of the Ghnicopidce are pro Abided with tAvo long 

 holloAv retractile filaments, generally beset Avith hairs, Avhich 

 they can protrude from the end of the abdomen, on the A'en- 

 tral side ; sometimes they exceed the body in length, and 

 are then rolled into an elegant helix. They emit, in most 

 cases, a distinct odour, Avhich is very strong in some 

 species {e. g,, Bvlemnia inaurata). Two similar filaments, 

 producing a strong odour, exist in the male of a Crypto- 

 lechia. I have seeil retractile pencils, tufts of hnirs, or 

 hairy protuberances, some of them emitting distinct 



