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THE ANATOMY OF INSECTS 51<br />
Genitalia. - The genitalia or intromittent organ of the male is more appropriately<br />
termed the :edeagus. It consists in a finger-like invagination of the<br />
ventral integument of the membrane between the ninth and tenth abdominal<br />
segments to receive the terminal section of the ejaculatory duct. The basal<br />
area which unites with the body is known as the proximal portion or tegurnen and<br />
the distal part, called the median lobe, corresponds to the penis in many other<br />
animals. It may be retracted within the tegumen in repose. The redeagus is often<br />
highly differentiated in the various insects and is extensively used by systematists<br />
in separating the species.<br />
SELECTED REFERENCES<br />
AARON, S. F., "The muscular power of insects," Sci. Am. pp. 148-150, Sept., 1932.<br />
BERl-ESE, A., Gli 11Isetti. LorD organizzazione sviluppo, abitudini e rapporti coll'uomo.,<br />
I: x + 1004, 1292 figs., refs. pp. 959-982; II: ix + 992, 895 figs., refs. pp. 897-<br />
922,957-977, Societa Editrice - Libraria, Milano, 1909.<br />
COCKAYNE, E. A., "Gynandromorphism and kindred problems," jour. Gen. 5: 75-128,<br />
pIs. XXI-XXIV, 10 diagrams, 1915.<br />
COMSTOCK, J. H., The wings oj insects, pp. xviii + 430, 427 figs., 1 pI., refs. pp. 417-423,<br />
Comstock Pub. Co., Ithaca, N. Y., 1918.<br />
COMSTOCK, J. H., and J. G. NEEDHAM, The wings oj insects, pp. 1-124,90 flgs., Comstock<br />
Pub. Co., Ithaca, N. Y. (reprinted from Am. Nat. 32: 1898; 33: 1899), 1898-99.<br />
DAs, G. M., "The musculature of mouth-parts of insect larvre," Quart. jour. Microscop.<br />
Sci. 80: 39-80, 12 pIs., 1937.<br />
DEAN, R. W., "Morphology of the digestive tract of the apple maggot, Rhagoletis pomonella<br />
Walsh," N. Y. Agr. Ext). Sta. Tech. Bull. 215: 1-17, 3 pIs., 8 refs., 1933.<br />
FELT, E. P., "Mias tor americana Felt, an account of Pedogenesis," N. Y. St. Entom.<br />
26th Ann. Repl., pp. 82-104, bibliography, 1911.<br />
GATENBY, J. B., "The segregation of the germ cells in Trichogramma evanescens," Quart.<br />
Jour. Micro. Sci. 63: 161-174, 1 fig., pi. 13, 1918.<br />
--, "Polyembryony in parasitic Hymenoptera: a review," Quart. Jour. Micro. Sd.<br />
63: 175-196, pIs. 14-15, 1918.<br />
GOLDSCHMIDT, R., The mechanism and physz'ology oj sex determination (Tr. by W. J.<br />
Dekin), pp. 1-259, 113 figs., Methuen, London, 1923.<br />
--, "Inter-sexuality in Lymantria;' Quart. Rev. Bioi. 6: 125-142, 1931.<br />
HENNEGUY, L. F., Les Insectes. Morphologie ReproducUon-Embryogenie, pp. xviii + 804,<br />
622 figs., 4 col. pIs., refs. pp. 495-756, Masson et Cie, Paris, 1904.<br />
HOLDAWAY, F. G., and H. F. SMITH, "Sex ratio and size of host: Alysia, Braconidre Hym.,"<br />
Austral. jour. Expt. Bioi. Med. Sci. 10: 242-259, 1932.<br />
IMMS, A. D., A general textbook of entomology, ed. 3, pp. xii + 727,624 figs., refs., Dutton,<br />
N. Y., 1934.<br />
--, Recent advances in entomology, ed. 2, pp. x + 425, 93 figs., B1akiston, Philadelphia,<br />
1937.<br />
LOWNE, T., The anatomy, Physiology, morjJhology, and development oj the blow fly, I:<br />
ix + 350, 47 figs., pls. I-XXI, 1890-1892, II: viii + 351-778, figs. 48-108, pIs.<br />
XXII-LII, 1893-1895.<br />
MACGILLIVRAY, A. D., External ins(Jct anatomy, pp. viii + 388, 142 figs., Scarab Co.,<br />
Urbana, Ill., 1923.