150 FIB ST ANNUAL REPORT OF 



green and deciduous trees. I have found it on the elms, the common 

 and the honey locusts, Lombardy poplar, catalpa, Norway spruce, 

 arbor-vibee, Osage orange, soft and silver maples, sycamore, apple, 

 plum, cherry, quince, pear, linden, and above all on the red cedar, 

 while Mr. Glover has also found it on the cotton plant in Georgia. It 

 is also exceedingly hardy and ruddy, and the young worms will make 

 their bags of almost any substance upon which they happen to rest 

 when newly hatched. Thus they will construct them of leather, pa- 

 per, straw, etc., etc., and it is quite amusing to watch their opera- 

 tions. 



Natural Remedies. — The only parasite which- has been hitherto 

 known to attack this Bag-worm is one known as Grypfus inquisitor* 

 Say, which Mr. Glover figures on Plate 11, Figure 5, of his yet unpub- 

 lished plates of four- winged flies. Last September, through the kind- 

 ness of Miss M. E. Murtfeldt of St. Louis, I discovered another parasite 

 which lives in the body of the worm to the number of five or six at a 

 time, and which after destroying their victim, spin for' themselves tough- 

 white silken cocoons within the bag, as represented at Plate 2, Figure 

 10. The Ichneumon fly which issues from these cocoons has never 

 been described, and as the sexes differ remarkably, I subjoin a full 

 description of each. The female is represented at Plate 2, Figure 11, 

 and the male at Figure 12, and it will be seen at once that while the 

 wings of the former are clouded, those of the latter are perfectly 

 clear. This fly belongs evidently to the genus TIemiteles though it 

 differs from most species in having the areolet wanting. 



Hemitei.es (?) thvridopteryx, N. Sp. — Length, 0.36; expanse,0.50. Fc-rrugiaous, opaque. 

 Head transverse, rather broader than thorax, the front much depressed ; face prominent centrally 

 beneath antenna-, closely punctured, thinly clothed witrh pale pubescence; clypeus and cheek3 

 shining-; tips of mandibles black ; aatennse, long, slender, filiform, ferruginous, blackish at . tips? 

 thorax rugose ; scutellum prominent, with sharp lateral margins ;. metnthor.ix prominent, quadrate, 

 abrupt laterally and posteriorly, finely reticulated and pubescent, the upper posterior angles pro- 

 duced on each side into a long, divergent, flattened, subacute spine ; disk with two longitudinal 

 carinas, from which diverges a central transverse carina; tegula prceous: wings hyaline, subiri 

 descent; a narrow, dark fuliginous band crosses the anterior pair a little before the middle, and a 

 broad band of same color between middle and apex, this band having a median transverse hyaline- 

 streak ; areolet wanting, second recurrent nervure straight, slightly oblique; apex of posterior 

 wing fuscous ; legs long and slender, ferruginuous, more or less varied with fuscous) ; posterio ? 

 coxae, tips of their femora, and their tibiae and tarsi, fuacous; base of four posterior tibia: mors 

 or less whitish, forming- a rather broad annulus on posterior pair ; abdomen. petiolated, subconvex, 

 densely and fini d, blackish, basal segment tinged witb reddish, the second ai 



segments distinctly margined at rip with whitish ; apical segments smooth and shining, thinly pu- 

 bescent; oviposito) half as lung as abdomen, sheaths blackish. 



C?.— Not at all like the 9 . Length 0.33 '.. long, slencter, black, polished/ 



without distinct punctures, thinly clothed with white pubescence ; palpi white ; antenna? long' 

 slender: scape reddish ; mesothorax gibbous, with two d ed longitudinal lines ; meta- 



thorax with well-defined elevated lines, forming several irn gular areas ; sides rugulose, apex ivitlT 

 out spines or tubercles; tegula? white ; wings whitish-hyaline, subiridesGent, the nervures and 

 Btigma white, subhyaline, neuration as in § 5 b?gs long, slender, pale honey-yellow; coxa), poste - 

 r iui trochanters, apex of their femora, and their tibise and tarsi, blackish} base of posterior tibiaa* 

 with awl abdomen long, slender, flatl i naooth and polished, the apical 



margin of second segment being narrowly whitish. 



Described from four 9_ and. one $ specimens bred from the same cocoon- 



