109 



cola bred from grass agree very perfectly with individuals of S. comi 

 found on Dogwood establishing colonies directly after the time of mi- 

 gration. Previous to the migration, Dogwood has been free from 

 aphides, as evidenced by condition of leaves and absence of moulted 

 skins or other indication, and finally winged panicola reared from grass 

 roots and transferred to Cornus leaves, establish colonies agreeing en- 

 tirely with those of comi on the same plant. My specimens agree per- 

 fectly with the description of Fabricius (Eut. Syst., IV, 214), but this 

 description is so brief and general that it might not be sufficient for de- 

 termination. Mr. Oestlnud, however (Aphididae of Minn., p. 28), states 

 that specimens collected in Minnesota agree in all respects with the de- 

 scription and figure by Buckton, and, as my specimens agree perfectly 

 with Mr. Oestlund's description, I adopt his reference to the European 

 comi. Walsh's furigicola (Proc. Ent. Soc. Phil., I, 304) is apparently a 

 fresh comi that he found resting on fungus ; and as he describes comi- 

 cola as like fungicola, except abdomen black, I am inclined to think he 

 had simply older or contracted specimens for the description of the lat- 

 ter. Passerini's Schizoneura vemista (Gli Afidi, p. 38), infesting roots 

 of grasses in Europe, is evidently the equivalent of panicola Thos. in the 

 United States, and I find by turning to Passerini's original description 

 that he mentions its similarity to comi Fab., without, however, suggest- 

 ing any relation between them. He says : 



Valde similis, Schhoneunv comi, quae autera di versa dorso oninino nigro in apteris, 

 et abdominis basi et apice tantuin albido in alatis. 



All discrepancies in the descriptions (which are very slight) seem to 

 me to be accountable on the ground of difference in appearance of the 

 recently issued and more mature individuals, along with a considerable 

 variation in extent of the black patch on the disk of the abdomen and 

 the number of sensoria on the third joint of the antenna?. 



NOTES ON THE BREEDING AND OTHER HABITS OF SOME SPECIES 

 OF CURCULIONID.E, ESPECIALLY OF THE GENUS TYLODERMA. 



By F. M. Webster. 



Speaking from an economic point of view, public interest in the spe- 

 cies of the genus Tyloderma is at present centered in fragarim Riley,* 

 from the fact that its larvae burrow into and destroy the thick bulbous 

 root of the strawberry. 



The life-history of the insect, from the time the immature larva is 

 found in the plant, has been quite fully studied; but its history up to 



*I received this species from Mr. C. N. Ainslie, of Rochester, Minn., in 1830, who 

 stated that it ^yas of rare occurrence. 



