INSECTS OP HAZEL, HEMLOCK, HEMP, HOPS. 135 



LITERATURE. 



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

 NCssLiN, Otto. Leittaden der Forstinsektenlauide, 2d ed., 1913. 

 Hess, R. Der Forstschutz, 1900, vol. 2. 

 LiNDiNGER, L. Die Schildlause (Coccidse), 1912. 



HEMLOCK SPRUCE. 



{Tsuga sipTp. Family Pinaceae.) 



Ornamental evergreen trees, very useful for parking, native of Xorth America, 

 East Asia, and the Himalayas. For convenience the insect pests are arranged under 



Conifers. 



HEMP. 



(Cannabis sativa Linnaeus. Family Urticaceae.) 



A native of Asia cultivated for the fiber obtained from its stems. Also used as an 



ornamental plant. 



I3IPORTANT HEMP INSECTS. 



COLEOPTERA. 

 Chrysomelldse. 



Psylliodes attenuata Koch; Europe. (See Hops.) 



LEPIDOPTERA. 

 Pyralidse. 



Pyrausta nubilalis Hiibner; Europe. (See Grain.) 



HOPS. 



(Humulus lupuhis Linnaeus. Family Urticaceae.) 



Vines cultivated in Europe and America for the hops, which are used in the brew- 

 ing of beer. 



A. BETTER KNOWN HOPS INSECTS LIKELY TO BE IMPORTED. 



Psylliodes attenuata Koch. 



(European Hop Flea-Beetle. Family Chrysomelidse; Coleoptera.) 



Hosts: Hops, hemp, stinging nettle. 



Injury: Feeds on foliage. The larva is supposed to breed in the cones of the hops. 



Distribution: Europe (Russia, England). 



SoRAUER, P. Handbuch der Pflanzenkrankheiten, 3d ed., 1913, vol. 3, p. 522. 



Hepialus humuli Linnseus. 



(Hop Root Borer. Hepialidae; Lepidoptera.) 



Hosts: Hops, potato, rape, corn, sorrel, dandelion. 



Injury: Bores in the roots. 



Description and biology: Moth, wing expanse 43-68 mm.; male above silvery white, 

 beneath brownish gray, female clay yellow, with pale brick-red marks on forewings. 

 Larva yellowish, spotted with black, with dark head; thoracic shield and spots on 

 second and third segments yellowish brown; 50-55 mm. The larva breeds in the 

 roots. 



Distribution: Europe. 



SoRAUER, p. Handbuch der Pflanzenkrankheiten, 3d ed., 1913, vol. 3, p. 320. 



Cecidomyia humuli Theobald. 



(Hop Midge. Itonididte [Cecidomyidee] ; Diptera.) 



Host: Hops. 



Injury: Attack the catkins. 



