A HISTORY OF CORNWALL 



following day has proved an effective remedy. The recurrence of the attack can generally be 

 prevented by removing the surface soil and destroying the enclosed cocoons. 



The only recorded attacks of the turnip saw-fly larvae or ' Niggers ' (jithalia spinarum] during 

 the last ten years have been on young broccoli in the Land's End district in 1899, on turnips near 

 Helston in 1901, and near Bude in 1905. The damage in each case, though severe, was very 

 local. 



Though Cepbus pygmaeus is very common throughout the county, the damage it does to grain 

 crops seems to be trifling, as not a single complaint or sample of injured stem or head has been sent 

 in during the last seven years. A few infested stalks have been noticed in the Grampound district 

 and about Truro, but in no case have they amounted to i per cent, of the total crop. 



Up to the present about four hundred saw-flies have been recorded from Great Britain, and 

 many of these appear to be extremely local. The following list of 181 species is evidently the first 

 that has been published for Cornwall, and though it represents the work of seven years, is by no 

 means complete. Several of the students have collected largely in different parts of the county, 

 but all the collections made are not now available ; and though every species is here recorded that 

 has been identified up to the present, the localities are not so complete as they would have been had 

 a note been kept of the capture of species already represented in the type collection. 



The succession of genera is that adopted by Konow. 



LIST OF THE PHYTOPHAGOUS HYMENOPTERA OCCURRING IN THE COUNTY 



Neurotoma flaviventris, Ratz. Liskeard 

 Pamphilius sylvarum, Steph. Truro 



sylvaticus, L. Newquay 



inanitus, Vill. Truro 

 - depressus, Schr. 



hortorum, Klug. Two specimens taken near 



Launceston, 18 May, 1904 

 Cephus femoratus, Curt. 



linearis, Schr. Trebartha 



arundinis, Giraud. Pencalenick, Truro 



- tabidus, Fab. Newjuay 



niger, Harris. Netejuay 



pygmaeus, L. 



Sirex noctilis, Fab. Bred at Saltasfi from an old fir 

 tree in the summer of 1902 (Bignell) 



gigas, scarce but widespread ; fairly common, 



Bodmin 

 Cimbex sylvarum, Fab. 



connata, Veil. Mount Edgcumbe 



femorata, L. One specimen taken near Calstock 

 Trichiosoma vitellinae, L. Near Truro 



lucorum, L. Upper Tamar 



betuleti, Klug. Lower Lynher 

 Abia sericea, L. 



nigricornis, Leach 



fasciata, L. 



Arge coeruleipennis, Thorns. Falmouth 



ciliaris, L. Falmouth 



fuscipes, Fall. Truro 



ustulata, L. E. Cornwall 



- atrata, Forst. E. Cornwall 



pagana, Pz. Truro 



rosae, de Geer. Truro 



cyanocrocea, FOrst. 



melanochra, Gmel. Truro; Falmouth 

 Lophyrus sertiferus, Fourc. Penzance district 

 Cladius pectinicornis, Fourc. E. Cornwall 

 Trichiocampus viminalis, Voll. Falmouth 



rufipes, Lep. E. Cornwall 



ulmi, L. Penzance (Daily) 



eradiatus, Htg. E. Cornwall 

 Priophorus padi, L. Widely spread 

 Camponiscus luridiventris, Fallen. Widely spread 

 Hemichroa alni, L. Bodmin 



rufa, Pz. Bodmin 



Dineura stilata, Klug. E. Cornwall 



testaceipes, Klug. Falmouth 



despecta, Htg. E. Cornwall 

 Cryptocampus pentandrae, Cam. R. Lynher 



angusta, Cam. E. Cornwall ; Truro 



saliceti, Cam. Liskeard 

 Pontania xanthogaster, Forst. 



leucosticta, Htg. 



nigrolineatus, Cam. E. Cornwall 



baccarum, Cam. Saltash ; Truro 



salicis-cinerea, Retz. R. Lynher 



bella, Zaddach. Widely distributed 



gallicola, West. Widely distributed 

 Pteronus bipartitus, Lep. 



pavidus, Lep. Truro 



miliaris, Pz. 



curtispinis, Thorns. 



melanaspis, Htg. E. Cornwall ; Falmouth 



tibialis, Newm. A single specimen captured on 



the Budock Downs 19 June, 1902 



myosotidis, Fab. E. Cornwall 



ribesii, Scop. 



melanocephalus, Htg. 



salicis, L. 



Amauronematus histrio, Lep. Calstock; Truro 



haemorrhoidalis, Spin. R. Lynher 

 Croesus septentrionalis, L. 



varus, Vill. Newquay 

 Holcocneme lucida, Pz. E. Cornwall 



coeruleocarpa, Hart. Looe vclley 



Nematus abdominalis, Pz. By the Lynher in June ; 

 Penzance (Baily) 



ruficapillus, Gmel. Penzance district 

 Pachynematus rumicis, Fallen. Truro ; Falmouth 



capreae, Pz. E. Cornwall 



obductus, Htg. Lower Lynher 



conductus, Ruthe. Lower Lynher 

 Pristiphora conjugata, Dbm. Two specimens found 



in a school collection, every insect in which 

 was collected round Truro and Falmouth 



pallidiventris, Fallen. Near Newquay 



appendiculata, Htg. Lower Lynher 



fulvipes, Fallen. Falmouth 



ruficornis, Oliv. 



Phyllotoma nemorata, Fallen. Looe valley ; Truro 



174 



