INSECTS more mountainous or more northern districts ; C. pustulosa comes as near to us as Reading, but I have not heard of it in Surrey ; nor has C. ruddii to my knowledge occurred in the county, though Smith says he has occasionally found it ' near London,' so that we may yet hope to find it here. One species, H. coriaceum, is recorded from Surrey only ; and if Holopyga gloriosa be really a British insect, it also probably may be added to the Surrey list, but the evidence is not completely satisfactory. The Chrysids which I know for certain to occur in Surrey are the following : LIST OF SURREY CHRYSIDS Cleptes pallipes, Lep. Clandon (Morice) Hedychridium roseum, Rossi. Chobham Notozus panzeri, F. Chobham (Saunders), (Morice) Waking, Ripley (Morice), Eyfleet (Smith) Hedychrum nobile, Scop. ? ( = lucidulum, F.) Ellampus auratus, L. Common everywhere Waking (Saunders) (Morice) Chrysis neglecta, Shuck. Longcross (Morice), aenus, F. Waking, Chobham (Morice) Chobham (Saunders) caeruleus, Dhb. Chobham (Morice) cyanea, L. Generally distributed (Morice) Hedychridium integrum, Dhlb. Chobham viridula, L. ( = bidentata, L.) Longcross, (Morice) Chobham, etc. (Morice) coriaceum, Dhlb. Ottershaw, Waking fulgida, L. Waking, Byfleet (Morice), (Morice) Weybridge (Smith) minutum, Lep. Chobham, Waking, etc. succincta, L. Waking and Ripley (Morice) (Morice), Weybridge (Smith) ignita, L. Common everywhere (Morice) PHYTOPHAGA The Phytophagous Hymenoptera, i.e. sawflies, wood wasps and gall- flies, are abundant throughout Surrey. Several well known entomo- logists have worked in the county and have obtained good results. No doubt many species still remain to be discovered, for comparatively few naturalists take up this particular branch of entomology. Consequently much interesting work might be done in apportioning the larva? to their imagos and elucidating their life histories. Sawflies can easily be bred and reared in captivity, and it is only by doing this in large numbers that we can hope to arrive at the laws which control that most mysterious phenomenon, parthenogenesis. In nearly all species the females far out- number the males, and in many kinds the male is extremely rare, scarcely occurring in the proportions of one to a hundred, and in a few cases it is absolutely non-existent. Pcecilosoma luteolum may be given as an example of a common species which only produces females. Several thousands of these flies have been bred for six years in succession and all turned out to be females. On the other hand many of the smaller Nemati only produce males from unfertilized eggs ; others hatch out males and females in fairly equal proportions. No rule can as yet be given for this pheno- menon, as one species will produce males only from virgin eggs while its near relation will persistently produce females ; such are Abia sericea and A.fasciata. Some few of the larvae are dimorphic, for example Hylotoma gracili- cornis, the larva of which is generally green with black and yellow 9 1
