LITERATURE 49 



Nicoletia (Fig. 30, B) the penis is slightly bifurcate distally and 

 apparently thus still retains traces of its former double origin. 



With regard to the homologies of the genitalia in the two sexes, 

 the present state of knowledge does not shed much light on the 

 subject. The claspers of the male, however, appear in a general 

 way to be the counterpart of the lateral valves of the female 

 ovipositor. When the coxites actually participate in the formation 

 of the claspers they are homologies with the ovipositor valves 

 just referred to. On the other hand, the styli, which are so 

 important a part of the male genitalia, are, except in a few rare 

 cases, no longer evident in the female. With regard to the inner 

 parts of the male genitalia, it is not possible, on the evidence at 

 present available, to discuss the subject to any advantage or 

 arrive at a definite conclusion respecting their homologies. 



Literature 



I. General 



HosKiNS and Craig, 1935, Physiol. Rev., XV., 525. 



Imms, 1936. Trans. Soc. Brit. EnU, III. Also " Nature," March 9th, 1937. 



Snodgrass, 1935. '' Principles of Insect Morphology." New York and 



London. 

 Weber, 1933. " Handbuch der Entomologie." Jena. 

 Wiggles WORTH, 1934. " Insect Physiology." London. 



II. Segmentation of the Head 



Eastham, 1930. Phil. Trans. Roy. Soc. B., CCXIX., 1. 

 FoLSOM, 1930. Bull. Mus. Comp. Zool. Harvard, XXXVI., 87. 

 Hansen, 1930. '* Studies on Arthropoda," III. Copenhagen. 

 Hanstrom, 1927-30. Zeitschr. Morph. Okol. Tiere, MIL, 543; XL, 152; 

 XIII., 329 ; XIX., 732. 



1928. " Vergleichende Anatomic des Nervensystems der wirbellosen 

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 Manton, 1928. Phil. Trans. Roy. Soc. B., CCXVI. 

 Mellanby, 1936. Quart. Journ. Mic. Sci., LXXIX., 1. 

 Philiptschenko, 1912. Zeits. wiss. Zool., CIIL, 519. 

 Roonwal, 1937. Phil. Trans. Roy. Soc. B., CCXXVII. 

 Silvestri, 1932. V'^ Cong. Internat. d'Ent.^ Paris, 329. 

 Snodgrass, 1928. Smithsonian Misc. Coll., 80, No. 1. 



1935. " Principles of Insect Morphology." New York and London. 

 Uzel, 1897. Zool. Anz., XX., 232. 

 Wiesmann, 1926. Inaug. Diss. Jena. 



III. Wing Venation 



CoMSTOCK, 1918. " The Wings of Insects." Ithaca, N.Y. 



CoMSTOCK and Needham, 1898-99. Amer. Nat., XXXII., 43 ; XXXIII., 118. 



Handlirsch, 1925. In Schroder's Handbuch der Entomologie, III., 117. 



