( lxvii ) 



than any from which I have seen it recorded. Possibly, 

 if the locality were revisited, it might be found that the 

 insect is actually established there. As it would not be 

 altogether a desirable addition to our regular Fauna, it is to 

 be hoped, perhaps, that such is not the case ! 



Egg-pockets made by Sawplies.— Dr. Chapman showed 

 some dried leaves of birch and hawthorn, with the egg-pockets 

 of Cimbex sylvarum and Trichiosoma tibiale respectively, from 

 which the larvae had hatched, showing the different relation 

 of the pockets to the margin of the leaf in the two species 

 (and genera?), and made the following remarks : — 



I happened to find last autumn on a birch in my garden a 

 larva of Cimbex sylvarum, Fab. From its cocoon there duly 

 emerged this spring a $ of that species. Having recently 

 interested myself in the egg-laying of some sawflies, I at once 

 submitted it to observation, and report the results so far 

 obtained, as presenting two points, at least, of interest. 



She emerged on May 14th, and I placed her at once on 

 some birch, when she immediately and apparently with 

 eagerness began to oviposit. 



At first it seemed that she did so in the middle of the leaf. 

 It soon, however, appeared that she selected a spot at a 

 definite distance from the margin, actually about 5 or 6 

 mm. from the edge of the leaf, the varying irregularities of 

 the leaf outline making more accurate measurement difficult 

 or illusive, say, a quarter of an inch. What struck me very 

 much, was that she moved with the slow lumbering manner 

 these large sawflies affect, and carelessly (to all appearance) 

 but quickly, took up what seemed an indefinite attitude, so 

 that one could not say it was always the same, or even very 

 similar, yet invariably the saws commenced operations at the 

 regulation distance from the margin of the leaf. 



In the two species of Trichiosoma I have watched, the same 

 apparently happy-go-lucky movements had an equally con- 

 stant result ; in them, however, the entry of the saws was so 

 close to the edge of the leaf that one supposed the actual 

 margin was desired. The egg did not appear to fill the pocket, 

 but occupied its long axis, parallel with the edge of the leaf. 

 The small space between the point of entry and the elliptic 



