148 AMERICAN HYMENOPTERA. 



case the host evidently died before it could spin up, for the 

 cocoon filled the body cavity and stretched the skin tightly. 

 The imago is of medium size, hence the cocoons maybe con- 

 sidered fairly typical, though they will be found to vary 

 somewhat in size. The cocoon is elongate-oval in shape, 

 16 mm. long and 17 mm. broad, made of dirty-gray silk. 



Economic importance. — This species is known to be para- 

 sitic upon a number of arctians and saturnians, but its real 

 value can not be estimated since the reports are brief and 



scattered. 



Hosts. 



Attacus bolincs. Specimens in United States National Museum. 



Atitomeris {Saturnia) /o Fabr. Ashmead, Trans. Amer. Ent. Soc, 

 Vol. 23, p. 192, Vineland, N. J. 



Callosamia proinethea Drury. Felt, N. Y. State Mus., Bull. 76, p. 

 105. 



Diacrisia {Arctia) virginica Fabr. Ashmead (Jackson, Miss.), 

 Trans. Amer. Ent. Soc, Vol. 23, p. 192. 



Ecpatitheria deflorata {scribonia) Fabr. Riley and Howard, Ins. 

 Life, III, p. 155, Columbia, S. C. 



Halisidota agassizii Pack. Specimen from Los Angeles, Cal., in 

 U. S. National Museum. 



Isia {Pyrrharctia) isabella Abb. and Sm. Riley and Howard, Ins. 

 Life, III, p. 155, Thomasville, Ga. 



Eremotylus macrurus (Linn.). 

 (Plate II, fig. 10.) 

 Ichneumon macrurus Linne., Syst. Nat., ed. 12, Vol. I, pt. 2, 



app 1767. 



" " Drury, Illustr. Nat. Hist., I, pp. 97, 132, pi. 



43, fig. 5 1770. 



" " Ph. L. Miiller, Linne. ; Vollst. Natursyst. 



Suppl., p. 319, n. 54 1776. 



" luteus americaftus Christ, Nat. Syst. Ins. Hym., p. 358, 



pi. 27, fig. 5 1791. 



Opkiofi glabratus Say, Boston Journ. Nat. Hist., I, p. 239 (Le 



Conte ed., II, p. 695). Type lost 1835. 



" macrurus Westwood, Drury's Illustr. Nat. Hist., ed. 2, 



I, p. 92, pi. 43, fig. 5 1837. 



rugosus Brulle, Hist. Nat. Ins. Hym., IV, p. 138, n. 1 1846. 



" tnacriirum Emmons, Nat. Hist. N. Y., V, p. 196, pi. 27, 



fig. 6 1854. 



glabratus Cresson, Proc. Ent. Soc. Phila., I, p. 206 1862. 



Norton, Idem, p. 358 1863. 



