56 [March, 



wing (tlie most active of all the species with which I am acquainted), 

 that it is not always easily captured. 



The flight of C. perla, on the other hand, is heavy, or perhaps 

 would be best described as weak in comparison, and when disturbed 

 it flies along very slowly, and is therefore far more readily netted. 

 C peria seems also to be much attached to Scotch fir and other fir 

 trees, but not exclusively so, for I have disturbed many specimens 

 from other trees, particularly from birch and sallow. Sometimes both 

 species are dislodged at the same time from Scotch fir, but I have 

 never found any difiiculty in recognising C. dorsalis on the wing, so 

 conspicuous is it by its darker colour and more rapid flight. 



Both species when disturbed resemble each other in one respect, 

 viz., that they will sometimes fly at once to the grovmd. Moreover, 

 both species fly naturally at dusk, and then it is that the slower flight 

 of C. perla is most marked, and of course nearly all the specimens 

 captured at twilight or dusk will be C. perla, the rapid flight and 

 darker colour of the other species making it more difficult to see, and 

 thus enabling it to get away. 



In common with the Chrysopidm generally, C. dorsalis, when 

 handled, emits a peculiarly disgusting odour ; but even in this respect 

 the principal subject of these notes compares f avovu'ably with C. perla, 

 which probably may well be considered to be the most " odoriferous " 

 of all the British Chrysopids. 



King's Lynn, Norfolk : 

 December, 1910. 



EXPLANATION OF PLATE I. 



Ova of Chrysopa dorsalis x 10. 



1 —1st day 'I 



2 — 2nd day j- . . .Coloration. 



3 —3rd day j 



4 — Body markings of C. dorsalis x Si. 



5 — Ova on Scotch Fir — natural size. 



6 — Head markings of C. dorsalis — larva. 



7 — Wings of C. dorsalis x 4, showing coloration of venation. 



8 — Tarsal claws of C. dorsalis (simple). 



8a — „ „ C. perla (mnch dilated). 



(From a photograph by Mr. A. Tonge, magnification 72 diameters). 



