On Vestigial Stigmata in the Arachnida. 149 



Genus AUTOCHARIS, Warren, MS. 

 18. Autochart's amethystina, sp. n. 



S . Palpi pinkish brown; antennas, body, and wings 

 luteous white ; thorax with a pinkish-brown stripe on each 

 side. Fore wings with the costal border pinkish brown ; a 

 broad pinkish-brown marginal band : hind wings with a 

 narrow similar band ; the inner edge of both bands dark 

 brown, sinuous, with a dentation into the band on the fore 

 wings in its centre ; cilia of both wings pinkish white. 

 Underside : legs, body, and wings white ; the wings are semi- 

 hyaline, and the marginal band shows through the wing. 



Expanse of wings i%— ro inch. 



Cherra Punji ; one example. North Kanara; two ex- 

 amples. 



Allied to A. fessalis, Swinhoe, which Warren makes the 

 type of the genus. 



XX 111. — Vestigial IStigmata in the Arachnida. By H. M. 



Bernard, M.A. Cantab. (Huxley Laboratory, Royal 



College of Science, South Kensington) . 

 In a preliminary note published in this Journal *, and later 

 in a fuller paper published by the Linnean Society f, I called 

 attention to a row of scar-like markings in certain Chernetidse 

 which segmentally repeat the functional stigmata. These 

 markings are, so far as one can see with the best microscopic 

 appliances, nothing but scars. Hansen J, who has also seen 

 them, believes them to be lyriform organs. At first, after 

 reading Hansen's paper, it seemed to me that they might well 

 be very large lyriform organs (as to the functions and mor- 

 phology of which we really know nothing §) and at the same 

 time the remains of vanished tracheal invaginations. I have 

 since compared the scars with lyriform organs in the Cher- 

 netidse, Araneidse, Solpugida?, Thelyphonidge, and Phrynidai, 

 and am convinced that they are not lyriform organs at all, 

 but simply the scars of apertures which have now closed. I 

 have mapped out the abdominal surface of my original speci- 

 men (figured in the second paper above referred to) , measuring, 

 by means of an eyepiece micrometer, the relative positions 

 of the scars and the bristles, which, as is well known, tend in 

 this group to be repeated segmentally. I am quite satisfied 



* " Additional Notes on the Origin of the Tracheae from Setiparous 

 Glands," Ann. & Mag. Nat. Hist. 1893, xi. p. 24. 



t " Notes on the Chernetidse, with Special Reference to the Vestigial 

 Stigmata and to a new Form of Trachea," J onrn. Linn. Soc.,Zool. vol. xxiv. 

 p. 410. 



\ 'Organs and Characters in different Orders of Arachnids,' Copenhagen, 

 1893. 



§ These organs are so minute and so scattered that it seems to me that 

 no trustworthy experiments are possible (cf. Oaubert's " Kecherches 

 sur les Arachnides," Ann. Sci. Nat, xiii. 1892). 



