August, '16] PIERCE: HABITS OF POLYDRUSUS 429 



7nas). In Saxony it is common on willow (Bargagli/ p. 59) ; in France 

 on hazelnut, oak and willow (Beclel,^ p. 242) ; also on alder, hazelnut, 

 plum (Prunus spinosa L.), apple and beet (Kleine,^ p. 104). 



The species is slender, and beautifully covered with green scales. 

 It very closely resembles ini'pressijrons. 



A technical description translated from Fahraeus, follows : 

 Polydrusus sericeus Schaller. Acta Hal., Vol. 1, p. 286; Gyllenhal, Schonherr's 

 Gen. et Sp. Cure, Vol. 2, pp. 148, 149; Fahraeus, Schonherr's Gen. et Sp. Cure, 

 Vol. 6, pt. 1, p. 450. 

 Oblong, black; clad with rounded opaque green scales; antennaj and legs palUd 

 testaceous; beak longer, frons lightly canaliculate; elytra moderately punctate 

 striate, interspaces flat; scape of antennae attaining but not passing eyes, funicular 

 joints 3-7 obconical. 



The Habits of Other Species in the Genera 



The records presented herewith are all that can be found concerning 

 the habits of these destructive weevils. 



The notes indicate that they lay the eggs in masses, that the larv» 

 seek their food, and that they feed on roots and pupate in the ground. 

 The onl}^ exception is cervinus, reported to breed in leaf rolls. 



Polydrusus delicatidus Horn occurs in lower California. 



Polydrusus peninsularis Horn also occurs in lower California. 



Polydrusus corsicus Tournier of Corsica feeds as an adult on the buds in various 

 plants, especially the oaks {Quercus ilex and Q. subei-). 



Polydrusus viridicollis Baudi does considerable damage at times to the foliage and 

 epidermis of new growth of ash (Fraxinus), Cytisus, the oak (Quercus cerris) and 

 maple {Acer). The adults drop when disturbed (Bargagli, p. 60). 

 Subgenus Cyphomimus Horn 



Polydrusus {Cyphomimus) americanus Gyllenhal {dorsalis Horn) has been beaten 

 from budding oak by Popenoe, found on the plum {Prunus virginica) by Jiilich, and 

 collected on many bushes by Hamilton. Occurs in Ontario, New York, West Virginia, 

 Maryland, Ohio, Michigan, and Kansas. 



Polydrusus {Cyphomimus) ochreus Fall is common on scrub oak at Cloudcroft, 

 New Mexico.^ 



Subgenus Ch^rodrys Duval 



Polydrusus {Chcerodrys) setifrons J. Duval of Europe lives on oak {Quercus ilex) 

 (Bargagli, p. 59). 



Polydrusus (? Chcerodrys) ynoricei Pic of Europe was taken on young shoots of oak.* 

 Subgenus Metallites Germar 



The insects of this subgenus live on Rosacae and Amentaceae, particularly Quercus 

 and Betula, and some of them on Conifers. 



Polydrusus {Metallites) impar Gozis {mollis Germar) of Europe feeds as an adult 

 on the young foliage of oak {Quercus suber L.), pines {Pinus silvestris L., P. pinea), 



'Bargagli, P., Rassegna Biologica Rincofori Europei, 1883-8. 



^Bedel, Faune Basin Seine, 1888. 



'Kleine, Ent. Blatter, 1910. 



^Cockerell and Fall, Trans. Am. Ent. Soc, Vol. 33, 1907, p. 212. 



6Pic, L'Echange, 1903, Vol. 19, p. 123. 



