12 THE ENTOMOLOGIST. 



part of Darwin's book on the * Descent of Man ' (pp. 280-300, 

 2nd edit,, 1894). 



There is no need to accept the hypothesis of sexual selection 

 for our purpose, since the observations of several naturalists, 

 including Dr. Hartman, Frit?- Miiller, Dr. Scudder, Mr. Bates, 

 and Mr. Marshall (Entom. xxix. 42), coincide to prove that the 

 females of certain insects, notably the Cicadas, are actually 

 brought together by the stridulations of the males. 



Of course it would be more conclusive if we could actually 

 find these organs of hearing that must be present to the females ; 

 but the failure of anatomy in this direction is not sufficiently 

 important to obliterate any just conclusions we have previously 

 gained from the deductive point of view. 



With relation to the stridulating organs of insects a word 

 may not be out of place. Among the Diptera, the Eeduvidae, 

 the Homoptera, the Orthoptera, with the Locustidse, and cer- 

 tain Coleoptera, possess this power of stridulating ; and it is a 

 noteworthy fact that these organs must have been exclusively 

 modified to their present pitch of perfection by natural selection 

 for the sole purpose of stridulation ; (though in this last state- 

 ment Mr. Arlile can use my own arguments with some effect 

 against me). 



Mr. Arkle, no doubt, justly complains_of the senses of touch 

 and hearing being confounded, but this hardly influences the 

 subject from a general point of view. Sir John Lubbock points 

 out that several supposititious, animal instincts and senses 

 would imply no meaning to us at all, since their parallels are 

 not experienced subjectively; but in our present state of know- 

 ledge it will be less awkward to employ the term " hearing " 

 where " sound" is concerned. 



College, Winchester, Dec. -itli, 1890. 



sT 



DESCRIPTIVE NOTES ON TWO COCCID^. 

 By T. D. a. Cockerell. 



(1.) Lecaniodiaspis celtidis, CklL, Psyche Suppt. p. 19. 



At the place cited are only a few lines of preliminary descrip- 

 tion ; the lull details are herewith given for the first time. 



2 . Length 3, breadth 2h, height 1| mm., broad-oval, convex, 

 above very light ochreous, conspicuously frosted with white secretion. 

 Under side pale orauge-yellow ; forming a complete ventral scale, but 

 of thin papery texture. Contents of body dark crimson. Eggs pale 

 pink. Antenufe pale brown, 8-jointed ; joints 8, 4, and 5 longest and 

 subequal, 4 a little the longer and about as broad as long ; 6 a little 

 shorter than 5, and about as broad as long ; 7 shorter than 6 ; 8 

 shortest, with several hairs ; 2 much broader than long, equal in 



