INJURIOUS LEPIDOPTEROUS INSECTS. 



Thyridopteryx ephemeraeformis Haworth. 



Tlie Bag or Basket-iuorm. 



(Ord. Lepidoptera : Fam. BoMBYCiDiE.) 



Sphinx ephemero'formis. Haworth: Lepidoptera Britannica, 1810, p. 72. 



yEcjeria ephemeroeformis. Stephens: Illus. Brit. Eutomol., Haust., i, 1828, p. 14.j. 



Thyridopteryx ephemermformis. Stephens: Illus. British Entomol., Haust., iv, 

 183.5, p. 387 ; in Trans. Ent. Soc. Lond., 1, 1836, p. 76. pi. 10, f. 1. 



Oiketicus up. Melsheimer (1840) : in Harr. Corr., 1869 p. 113. 



Oiketicus sp. Harris : Treat. Ins. NewEng., 1852, p. 319 ; Ins. Inj. Veg.,1862, p. 

 415 ; Ent. Corr., 1869, pp. 150, 243, 246 ; lb., Oiketicus coniferarum, pp. 

 177, 299, pi. 3, f. 4. 



Thyridopteryx ephemermformis. Morris : Synop. Lep. N. Amer., 1862, p. 143. 



Thyridopteryx ephemermformis. Packard: in Proc. Ent. Soc. Phila., iii, 1864, p. 

 350; lb., (Eceticus coniferarum Harris MSS.,p. 351; Guide Stud. Ins., 

 1869, p. 291, f. 222 ; Ins. Inj. Forest and Shade Trees, 1881, p. 248. 



Hymenopsyche coniferarum. Grote : in Proc. Eut. Soc. Phila., v, 1865, p. 249 : 

 Thyridopteryx ephemeraformis, New Check-list Amer. Moths, 1883, p. 

 18. no. 203. 



Thyridopteryx ephemercvformis. Clemens : in Proc. Ent. Soc, Phila., vi, 1866, pp. 

 321. 233; in Tineina N. Amer. (Stainton), 1873, p. 374. 



Thyridopteryx ephemermformis . Glover : in Month. Repts. Dept. Agricul., I860, 

 p. 433. — Rathvon : in Prac. Entomol., ii, 1857, p. 53. — Riley : First 

 Ann. Kept. Ins. Mo., 1869, pp. 147-151, f. 84. — King: in Psyche, iii, 

 1871, p. 241. — Lintner : in Count. Oent., xlv, 1880, pp. 535, 631.— 

 Marten: in Thomas' Tenth Rept. Ins. 111.. 1881, p. 118, f. 33.— H. Ed- 

 wards : in Papilio, ii, p. 24. 



Numerous reports reached me from the southern portions of the 

 State of New York during the summer of 1880, of depredations upon 

 arbor vitae, whicli I was able to refer to the above-named insect. A 

 letter from "West Brighton, Staten Island, stated : "I have recently 

 found several arbor vitses standing together in a row completely 

 stripped of their foliage, and covered with cocoons like those sent, 

 strongly attached to the twigs. I have never before remarked any 

 tiling of the kind. Please inform me whether you know of the arbor 

 vitfe being frequently despoiled in this manner. If so, its usefulness 

 as a hedge plant will be greatly impaired." 



The Bag or Larval Case and the Insect. 



The case built by this insect for its shelter during its caterpillar 

 stage, and subsequently to serve for its cocoon within which to un- 

 dergo its pupation, is so peculiar in appearance and structure, that 

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