109 



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

 found ou Dogwood establisbiug colonies directly after the time of mi- 

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

 aphides, as evidenced b^" condition of leaves and absence of moulted 

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

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

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

 fectly with the description of Fabricius (Ent. Syst,, iv, 214), but this 

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

 termination. Mr. Oestlund, however (Aphididfe 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 i)erfectly 

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

 corni: Walshes fungicola (Proc. Ent. Soc. Phil., i, 304) is apparently a 

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

 cola as like /wn^ico^a, except abdomen black, I am inclined to think he 

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

 ter. Passerini's Scliizoneura vemista (Gli Afidi, i). 38), infesting roots 

 of grasses in Europe, is evidently the equivalent of 2>anicola Thos. in the 

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

 that lie mentions its similarity to corni Fab., without, however, suggest- 

 ing any relation between them. He says : 



Valde similis, Scliizoneurw corni, qiue antem diversa dorsoomniuo nigro in apteris, 

 et abdomiuis basi et apice tautiim albido iu alatis. 



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

 me to be accountable on the ground of difference in ai^pearance of tbe 

 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 antennse. 



NOTES ON THE BREEDING AND OTHER HABITS OF SOME SPECIES 

 OF CURCULIONID^, 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 Tylodcrma is at present centered in fragaria', Riley,* 

 from the fact that its larviB 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 j but its history uj) to 



*I received this species from Mr. C. N. Ainslie, of Kochester, Minn., in 1880, who 

 stated that it was of rare occurrence. 



