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 



