CABBAQE INSECTS. 49 



A. BETTER KNOWN CABBAGE PESTS LIKELY TO BE IMPORTED. 



Contarinia torquens Meijere. 

 (Cabbage Midge. Itonididae [Cecidomyidae] ; Diptera.) 



Hosts: Cabbage. 



Injury: Attacks young cabbage plants, especially, breeding in the leaf axil and 

 hindering growth. Has several generations. Pupates in soil. 



Distribution: Europe. 

 SoRAUER, P. Handbuch der Pflanzenkrankheiten, 3d ed., 1913, vol. 3, p. 447. 



Dasyneura brassicse Winner. 



(Cabbage Gall Midge. Itonididse [CecidomyidseJ; Diptera.) 



Hosts: Cabbage, rape. 



Injury: Breeds in fruit. 



Description and biology: Fly blackish brown, thorax covered with pubescence giving 

 a silvery sheen, abdomen flesh red, with black bands; length 1.2-1.5 mm. long, milk 

 white. Forms a gall in the fruit, feeds on the seed. 



Distribution: Europe. 

 SoRAUER, P. Handbuch der Pflanzenkrankheiten, 3d ed., 1913, vol. 3, p. 454. 



Pbaonia trimaculata Bouch^. 



(Cabbage Maggot. Anthomyiidae; Diptera.) 



Hosts: Cabbage. 



Injury: Breeds in the roots. 



Description and biology: Fly light gray, four black interrupted streaks and three 

 brown spots on thorax; eyes hairy; length 8 mm. Maggot 11 mm. long. 



Distribution: Europe. 

 SoRAUER, p. Handbuch der Pflanzenkrankheiten, 3d ed., 1913, vol. 3, p. 432. 



B. IMPORTANT CABBAGE PESTS. 



ORTHOPTERA. ^ 



Gryllotalpidse. 



^Scapteriscus didactylus Latreille; Porto Rico, Georgia; quite injurious, cuts below surface of soil. 



COLEOPTERA. 

 Elateridse. 



Agriotes lineatus Linnaeus. (See Tobacco.) 



Chrysomelldse. 



Psylliodcs chrysocephala Linnaeus and P. napi Fabricius. (See Rape.) 



B rachyrhlnldse. 



^Barynotus squamosus Germar; Europe, Canada; adults strip plants to ground. 



Curciilionidse. 



Baris glabra Herbst, B. chlorizans Germar, B. opiparis Duval; Europe; breed in root and stem. 

 Bans carulescens Scopoli; Europe; breeds in stem. 



Baris lepidii Germar, and B. viridisericea Goeze; Europe; breeds in root and crown. 

 Ceutorhynchus cyanipennis Germar, and C. sulcicollis Paykull; Europe; breeds in crown. 

 Ceutorhynchus quadridens Panzer; Europe; breeds in roots. 



LEPIDOPTERA. 

 Pieridse. 



Picris monuste Linnaeus, Porto Rico, southern United States; cabbage worm. 



Pyralidse. 



Evergestis extimalis Sc. (See Rape.) 



Plutellidse. 



Plutella maculipennis Curtis; cosmopolitan; destructive to leaves. 



27812—18 4 



