oq [February, 



variation (noted by Schiner) in the condition of the forked nervures ; the 

 relative strength and weakness of nervures in these figures is in agreement 

 with their natural proportions, and is referred to at Vol. iv, p. 8. 



o, b, d — Q-enitalia, S ■ «j superior appendage ; b, inferior appendage 5 d, penis, of 

 P. 31 (a, d) in two positions 5 Ps. Nos. 2 (a, b, d), 3 and 4 (a), 5 (a, d), 

 and 6 (&). 



e — External genitalia, ? , from the side, of Ps. No. 6. 



Algeria: 1893. 



NOTES ON SOME BEITISH AND EXOTIC C0CCID2E (No. 27). 

 by j. w. douglas, t.e.s. 

 The Migration of Coccids. 

 On June 5th, 1891, 1 found, at the distance o£ a mile from here, 

 on a small bush of hawthorn, several gravid females of Pulvinaria 

 oxyacanthcB, Linn., with ovisacs full of eggs and larvae, and transferred 

 some of these masses to a hawthorn-bush growing in the boundary- 

 hedge of my garden, on which no Coccids existed, hoping thus to 

 establish the species here by the next year. In the spring of 1892, 

 however, the terminal shoots of the bush, on which the Coccids would 

 naturally be situate, were cut off, and so 1 feared ended my expecta- 

 tions, for subsequently I could not find any scales ; but there must 

 have been some undetected, for on the 2nd inst., that is, a month 

 before the usual time of year, I saw two full-grown females on the 

 bush, but I had not been on the alert early enough to notice their 

 development. The transfer of a species from one plant to another of 

 the same kind at a distance being quite practicable, some persons 

 may possibly be induced to experiment with other species than that 

 mentioned, with a view to watching the development of these singular 

 insects, of which the life-history presents many interesting features. 

 The female forms of the Lecaniidce, it is true, are not attractive, but 

 the males are wonderful in form and beautiful in appearance, in these 

 respects rivalling the small Lepidoptera ; they are so short-lived, and 

 so rarely obtained, except by rearing, that those of many species have 

 never been observed ; indeed, it has been questioned if in some they 

 exist at all in an external appreciable form. The rearing of Lecaniidce 

 in gardens on trees which are already there, or to be planted for the 

 purpose, would doubtless bring to light the knowledge of many re- 

 condite points in the economy of several species. JSo harm to the 

 trees would accrue, for it is only when Coccids are in excessive numbers 

 tbat they are injurious, and in such experimental cases as these would 

 be, they could easily be regulated. 



