A HISTORY OF ESSEX 



unavailing, and among other theories it has been suggested that in their 

 case males formerly existed, but owing to the increase in the faculty of 

 virgin reproduction they have ceased to be produced, being no longer 



necessary. 



There is a very able and valuable paper on the ' Galls of Essex ' by 

 Mr. Fitch in the Transactions of the Essex Field Club (ii. 98-156), 

 which deals with all the gall-feeding insects, and to which the reader 

 who desires further information can be confidently referred. 



In the following list of T'enthredinidce some names will be found 

 which do not appear in Cameron's Phytophagous Hymenoptera. Certain of 

 these belong to species which were not known as British when that work 

 was written, and in other cases it has been deemed advisable to follow 

 the more recent classification and nomenclature of Konow, which is 

 partially adopted in Cameron's fourth volume. Some of the Sawflies are 

 extremely difficult to determine correctly, and all such have been sub- 

 mitted either to the Rev. F. D. Morice or Pastor Konow, to whom we 

 are indebted for much of the most recent work done in the group here 

 and on the continent. All the Tenthredinidte named below have been 

 found in the Colchester district with one exception, for which the 

 locality is given. The list of Cynipidee is taken from Mr. Fitch's ' Galls 

 of Essex.' 



A LIST OF THE PHYTOPHAGOUS HYMENOPTERA OCCURRING IN 



THE COUNTY 



TENTHREDINID^E 

 LYDIT/E 



Lyda, Fabr. 



flaviventris, Retz. 



inanita, Vill. 



sylvatica, L. 



hortorum, Klug. 



cingulata, Latr. 



pallipes, Zett. 



albopicta, Thorns. 



depressa, Schr. 

 Cephus, Latr. 



phthisicus, Fabr. 



pygmaeus, L. 



tabidus, Fabr. 



pusillus, Steph. 

 Macrocephus, Schlecht. 



satyrus, Pz. 

 SIRICET.*: 



Xiphydria, Latr. 



dromedarius, Fabr. 

 Sirex, L. 



juvencus, L. 

 - gigas, L. 



TENTHREDINET.S 

 Cimbex, Ol. 



lutea, L. 



femorata, L. 

 Trichiosoma, Leach 



vitellinae, L. 



TENTHREDINETVE (continued) 

 Trichiosoma betuleti, Klug. 

 Ahia, Leach 



fasciata, L. 



sericea, L. 

 Arge, Schr. 



enodis, L. 



gracilicornis, Klug. 



fuscipes, Fall. 



ustulata, L. 



pagana, Pz. 



cyanocrocea, FOrst. 

 - rosae, De Geer 



Lophyrus, Latr. 



sertiferus, Fourc. 

 Cladius, 111. 



pectinicornis, Fourc. 

 Trichiocampus, Htg. 



viminalis, Fall. 



rufipes, Lep. 



eradiatus, Htg. 

 Priophorus, Latr. 



padi, L. 

 Leptopus, Htg. 



luridiventris, Fall. 

 Hemichroa, Steph. 



alni, L. 



rufa, Pz. 

 Dineura, Dhlb. 



stilata, Klug. 



1 08 



