BIOLOGY OF PARACOPIDOSOMOPSIS. 305 



Marchal examined sixteen broods of Polygnotus minutus, and 

 found eight female broods, six male, and two mixed, one with 

 three females and one male, the other with three females and 

 three males. 



The only other investigator to record data on the sexes of 

 polyembryonic parasites is Silvestri. In one hundred and sixty 

 broods of Litomastix he found sixty-three female, ninety-two 

 male, and five mixed broods. He does not record the number of 

 individuals for any of these broods. 



I should like to point out in conclusion that there is very great 

 need for exact data on the sexes of polyembryonic insects. 



AUSTIN, TEXAS, 



January 17, 1917. 



REFERENCES. 

 Bridges, Calvin B. 



'16 Non-disjunction as Proof of the Chromosome Theory of Heredity. Gene- 

 tics, I., pp. 1-52, 107-163. 

 Bugnion, E. 



'91 Recherches sur le developpement postern bryonnaire 1'anatomie et les moeurs 



de 1'Encyrtus fuscicollis. Recueil Zool. Suisse, V., pp. 435-534. 

 Lillie, F. R. 



'16 The Theory of the Free-Martin. Science, XLIII., pp. 611-613. 

 Marchal, P. 



'04 Recherches sur la Biologie et le Developpement des Hymenopteres Parasites. 

 I., La Polyembryonie Specifique ou Germinogonie. Arch, de Zool. Exper. 

 et Gen., Vol. II., pp. 257-335. 

 Patterson, J. T. 



'15 Observations on the Development of Copidosoma Gelechiae. BIOL. 



BULL., XXIX., pp. 333~373- 

 Silvestri, F. 



'06 Contribuzioni alia conoscenza biologica degli Immenotteri Parassiti: I., 

 Biologia del Litomastix truncatellus Ann. d. Regia Scuola Superiore di 

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 Silvestri, F. 



'08 Contribuzioni alia conoscenza biologica degli Immenotteri Parassiti. II., 



Sviluppo dell'Ageniaspis fuscicollis. Ibid., Vol. VIII., pp. 1-27. 

 Wheeler, W. M. 



'10 The Effects of Parasitic and other Kinds of Castration in Insects. Jour, 

 of Exper. Zool., Vol. 8, pp. 37"-43 8 - 



