THE BAa-WOIlM : KEMEDIES FOR ATTACK. 87 



Tachina ? sp. — This lly, a large bluish Tachinid, has not been 

 specifically detenniued. Its eggs had been found by Prof. Riley com- 

 monly attached to the bags, always externally near the neck, whence 

 the young larva3, upon hatching, worked their way into the case. They 

 frequently failed, however, to reach their victim, as was proved by a 

 number of empty egg-shells upon bags in which the larva was not 

 })arasitized. 



Eemedies. 



Undoubtedly, either of the arsenical insecticides applied to their 

 food-plants would destroy the young larva?; but the best method of 

 arresting the depredations of this insect, when it abounds to an annoy- 

 ing extent, is to collect the cases by hand when they have attained a 

 size to permit of their easy discovery, and crush or burn them. This is 

 a very effectual method with this species, for as the female has not the 

 power of flight, being without wings, and never leaves its case even for 

 the deposit of its eggs, a tree which has once been completely de-cater- 

 pillared (to translate a French word), can only become re-infested 

 from contact of its branches with another infested tree, or from such 

 a proximity to it that the intermediate space of ground could be 

 traversed by caterpillars driven to migration for their food. The in- 

 convenience of dragging their rough cases over the ground would pre- 

 vent their travel to any great distance. 



An instance is recorded of two barrels of the cases of this insect 

 having been gathered and destroyed at one time from some young trees 

 in a public park in the city of St. Louis, Mo.* 



Tolype laricis (Fitch). 



Tlib Larch Lappet. 



(Ord. Lepidoptera : Fam. Bombycid^.) 

 Planosa laricis Fitch : in Trans. N. Y. St. Agricul. Soc. for 1855, xv, 1856, pp. 



494-501, pi. 2, figs. 5,6 ; 1st and 2d Kept. Ins. N. Y., 1856, pp. 262-269, 



pi. 2, figs. 5,6. 

 Oastrapacha laricis. Morris : Synop. Lep. North Amer., 1862, p. 234 (description) 

 Oastrapacha velleda (StoU), var. minuta Qrote : in Proc. Ent. Soc. Phila., ii, 1863, 



p. 433. 

 Tolype laricis. Pack.\ud : in Proc. Ent. Soc. Phila., iii, 1864, p. 387; Ins. luj. 



Forest and Shade Trees, 1881, p. 254. 

 Tobjpe laricis. Qrote: in Proc. Amer. Philosoph. Soc. for Nov. 1874, xiv, p. 263- 

 Tolype laricis. Gilbert : in Papilio, ii, p. 25 (food-plant and date of collection). 



The common name of the larch lappet-moth given to this species 

 by its original describer, Dr. Fitch, was in consideration of the par- 



* First Reiyort onthe Insects of Missouri, 18()9, j). 161. 



