
Hosts of Insect Eggparasites in Europe, Asia, Africa and Australasia. 239 
Gonatocerus and Polynema and of the Trichogrammatidae such as 
Oligosita and Trichogramma. Indeed, the latter family strikes me as 
being a rising one and eggparasitism strikes me as being on the increase, 
seemingly opening up a new, attractive and unfailing source of food for 
those insects which are variable enough and adaptive enough to avail 
themselves of it. 
A single species of parasite may have a great many different 
hosts scattered over several orders, either in the same locality or over 
many different localities (e. g. Trichogramma minutum Riley). On the 
contrary, a single host species may have several or more parasites of 
different groups in the same locality. As many as three distinct genera 
of Trichogrammatidae have been reared from the eggs of Horiola 
arquata at the same time and in the same place; from Anasa tristis an 
encyrtid, three congenerie species of a scelionid and a eupelmid have 
been reared at different times. The majority of hosts are Lepidopterous 
and this is more or less significant because the eggs of this order of 
insects are usually deposited in masses and nearly always in exposed 
situations; therefore they are readily seized upon. It must not be 
supposed, however, that the use of eggs as hosts is limited by this 
condition, since the Hemiptera and Orthoptera are also commonly and 
abundantly used as hosts and a large number of these place their eggs 
in hidden places, quite often into the woody twigs and stems of trees 
and shrubs or gathered into specially hardened cases. 
Literature Referred to. 
1833. Haliday, A. H. Ent. Mag., London, I, p. 548. 
1834. Nees ab Esenbeck. Hymenop. Ichneumonibus affinium Monogr., Il. 
18356. Walker, Francis. Ent. Mag., London, III, p. 353. 
1839. wald) John Obadiah. Introduction Modern Classification Insects, 
(ci. p. 422). 
1840. ER John Obadiah. Ib. II. 
1841. Foerster, Arnold. Beiträge zur Monographie der Pteromalinen Nees, 
Aachen, Heit I. 
1844. Westwood, John Obadiah. Trans. Ent. Soc. London, IV (1845—1847). 
1851. Foerster, Arnold. Verhandl. d. Naturhist. Verein. d. preuss. Rheinl. 
1871. Giraud. Annales Soc. Ent. France. (See Zool. Record, 1871.) 
1871. Id., ibid., series 5, I, Bull., p. XVII. 
1871. Newman, Edward. The Ent., London, V. 
1874. Dours. Cat. Synonym. Hymenop. de France, Amiens. 
1876. Mayr, Gustav. Die europäischen Encyrtiden. Biologisch und systematisch 
bearbeitet. } 
1877. Giraud, Joseph: Etienne and Alexandre Laboulbene. Annales Soc. 
Ent. France, 5° serie, VII. 
1877. Rondani, Camillo. Respertorio degli insetti parassiti e delle loro 
vittime. Supplemento alla parte Prima. Estratto dal Bull. Soc. Ent. Italiana, 
Anno IX. 
1880. Lichtenstein. Le Naturaliste, II. 
1880. Packard, A. S. Guide to the Study of Insects, New York, edition 7. 
1887. Riley, Charles Valentine. Report Ent., in Rep. U. S. Commissioner 
of Agric. f. 1886, Washington. 
1888. Howard, Leland Ossian. Proceedings Ent. Soc. Washington, I, p. 133. 
1891. Howard, Leland Ossian. Proceedings U. S. Nat. Museum, XIV. 
1892. Riley, Charles Valentine and Leland O. Howard. Insect Life, 
U. S. Dept. Agric., Washington, IV. 
18933. Ashmead, Wm. Harris Bull. Nr.45, U. S. Nat. Museum, Washington. 
1894. Idem. Trans. Amer. Ent. Soc., Philadelphia, XXI. 
1895. Idem. Bull Illinois St. Laby. Nat. Hist., Urbana, IV. 
1897. Enock, Fred. Proc. Ent. Soc. London. 
