16 THE ZOOLOGIST. 



that crick like a scratchy pen over the circular vein at the base 

 of the hinder. The specimen of Ageronia feronia I have been 

 experimenting on comes from the forests of Bahia, where Darwin 

 heard its parchment rustle during the wet season at the close of 

 February, 1832 ; my father was there eight years later, and he 

 has left behind him his sketches of the bay that transport me to 

 the groves where it takes its delight. Fritz Miiller, on Oct. 13th, 

 1876, saw two other butterflies chasing one another and making 

 a similar clicking sound, after which they settled with their 

 wings horizontally expanded on the dry stems of the Tagnara or 

 bamboos that flourish at the mouth of the Eiver Trombudo, a 

 tributary of the Itajahy. He captured one, and it proved to 

 be Eunica margarita. Mr. W. J. Kaye informs us that Gyncecia 

 dirce, found in Jamaica and Brazil, makes a loud clicking sound 

 when flying, and Mr. Edwards heard a similar sound when 

 the butterflies of the genus Prepona, also inhabitants of Tropical 

 America, took flight from the tree-trunks. The caterpillars of 

 the Paphia glycerium feed on the Croton capitulatum that grows 

 on the prairies that border the course of the Mississippi, and 

 when the butterfly takes wing its flight is rapid, and a dry and 

 whistling sound is heard ; like the " painted lady," it returns 

 when disturbed to its sunny resting-place, and Dr. L. K. Hay- 

 hurst, in February, 1870, found it hybernating in company with 

 the " painted lady " and " Camberwell beauty " in a hollow of a 

 tree filled with hickory-shells. What is remarkable, its cater- 

 pillar is a leaf-roller ; that of the "painted lady " has something 

 of this habit ; those of the " skipper butterflies " are leaf-rollers. 

 I do not know whether there is an existing link like our little 

 Nemeohius lucina, that flies among the wild columbine in the 

 New Forest, to connect the species that have four legs with those 



that have six. 



From resentment certain butterflies rustle their silken 

 robes ; the sound is produced as before, only the vein that 

 runs along the inner margin of their fore wing, and which 

 moves over the curved one on the hinder, is notched like 

 a file. Mr. Edwards tells us Charaxes sempronius, a native 

 of Australia, as it alights on the branches of the sweet-scented 

 blossoms of the Bursaria spinosa, closes its wings with a grating 

 sound, which it repeats testily when disturbed. The year 1837 



