1904.1 273 



Described from denuded wings of E. barcinonella, Mill., ^ (71828, 

 Mus. Wlsm.). So far as can be judged without denuding a specimen, 

 E. stigma, Stgr., and E. barcinonella, Mill., are identical in neuration. 



3032 : 2. — Symmoca sericiella, up. n. 



Antennae brownish grey, paler at tlie base. Palpi rising above the base of the 

 antennae, the terminal joint one-third of the median ; yellowish white. Head and 

 yAorrta; yellowish white. Forewinga elongate, lanceolate ; shining, silky, yellowish 

 white, with a faint indication of a group of ochreous scales at the end of the cell, a 

 smaller group in the middle of the fold and one or two on the disc slightly preceding 

 the latter; in some specimens (var. B), which at present I am unable to separate 

 from this species, these spots are absent, while in others (var. C) I find not only the 

 spots, but a tolerably plentiful dusting of single scales of the same colour, evenly 

 distributed, especially over the outer half of the wing and along the costa, the whole 

 insect thus assuming a more distinctly ochreous tinge ; cilia yellowish white. 

 Exp. a/., 12 — 14 mm. Sindioinqs pale, shining, rosy grey; cilia pale yellowish. 

 Abdomen and Legs very pale brownish cinereous. 



Ti/pe, c? (96452) ; var B (? (96453) ; ? (96457) ; var. C ^ 

 (96454). Mus. Wlsm. 



Rab.: ALGEKTA— El-Kantara, 8-23.V.1903 ; Hammam-es- 

 Salaliin, 17.V. 1903. Nineteen specimens. 



This species is somewhat widely distributed about El-Kantara, 

 flying low in open places in the early morning. 



Allied to albidella, E,bl., but the hindwings are never white as in 

 that species. 



(To he continued). 



THE STRIDULATION OF PASSALID^. 

 BY D. SHARP, M.A., M.B., F.R.S., do. 



In Ent. News Philad., vol. xii, p. 271, Mr. Babb has given an 

 account of the stridulation of Passalus cormitus. I have no dissected 

 specimens of that species, and I am therefore unable to state whether 

 the details he gives are correct, but I have no doubt he is quite right 

 as to his general interpretation, and that he has discovered an organ 

 that several of us had previously looked for and failed to notice ; 

 while Leconte and Ohaus gave an interpretation which, as I always 

 felt assured, is quite fabulous. 



My object in this note is not merely to congratulate Mr. Babb, 

 but also to point out that his discovery has solved a riddle that has 



