92 RESULTS FROM GIPSY MOTH PARASITE LABORATORY. 



being absorbed from the constantly ingested supply of fresh tissues 

 of the host. 



The larva while still small assumes a more or less definite^ position 

 in the body cavity of the host, and generally lies toward the poste- 

 rior half of the body, either above or below the digestive tract and 

 with its head directed caudad in respect to the host. During its 

 whole life the larva feeds on blood and lymph and on small solid 

 particles which result from the disintegration of the host's tissues, 

 probably pathologically induced by some larval secretion. There 

 is no evidence to show that such definite organs of the host as the 

 digestive tube and muscular tissue can be consumed by the larva 

 unless they are broken down, inasmuch as the mouthparts of the 

 larva throughout life are essentially sucking. 



Under artificial conditions the minimum time needed for the de- 

 velopment of tlte insect from the eg;g to the adult was found to be 

 about 50 days, but the maximum time may be extended many months. 

 Under natural conditions in the Northern States as a parasite of 

 lll/phantria, the females are probably active in parasitizing the cater- 

 pillars throughout the month of August and the first part of Sep- 

 tember. The larvai issue from the caterpillars and spin their cocoons 

 during September and the first part of October, but the cocoons 

 always overwinter, and the adults emerge the foUoAving summer. 



BIBLIOGRAPHY. 



1S64. Crksson, E. T.— Proc. Ent. Soe. Pliila., vol. .'{, p. 258. 

 1879. Pkovanciiek, L. — Nat. Cnuad., vol. 11, p. 174, fig. 9, a. 

 1883. Provancher, L. — Fauna Eut. Can. Hym., p. 307, fig. 44, a. 

 1890. ASHMEAD, W. H.— Proc. U. S. Nat. Mus., vol. 12, p. 429. 

 1844. Ratzebur«, F. T. C. — Die Forstinsecten. 



1896. CuENOT, L. — Etudes jihysiologiques sur les Orthopteres. (Pbagocytose.) 



Ar-ch. Biol., vol. 14, pp. 315-325. 



1897. Howard, L. O. — A study in insect parasitism. Tech. Ser. 5, Bur. Ent., 



IT. S. Dept. Agr., p. 23, tig. 10. 



1906. Janet, C. — Remplacement des muscles vibrateurs dn vol par des colounes 



d'Adipocytes, chez les fourmis at)res le vol nuptial. C. R. Acad. Sci., 

 vol. 142, pp. 1095-1098. 



1907. Janet, C. — Histolyse sans phagocytose, des muscles vibrateurs du vol, 



cbez des reines des fourmis. C. R. Acad. Sci., vol. 144, pp. 393-396. 

 1910. Pantel, J. — Recbercbes sur les Dipteres a larves entomobies. (Mani- 

 festations eventuelles de la reaction defensive.) La Cellule, vol. 26, 

 pp. 158-160. 



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