NOTE ON THE GENITAL ORGANS OF ZAITHA. 
THOMAS H. MONTGOMERY, Jr. 
THE hemipterous genus Zaitha has a remarkable structure 
of the inner genital organs, particularly in the male, which 
deserves to be made known. Leidy (History and Anatomy of 
the Hemipterous Genus Belostoma) assumes, as I believe most, 
if not all, entomologists have subsequently done, that Belos- 
toma and Zaitha are closely related genera of the same family. 
He states (/oc. cit., p. 59): ** The principal marks of distinction 
between Belostoma and Perthostoma (Zaitha) are in the form 
of the promuscis; the form of the antennae; the form, com- 
parative size, and situation of the patch of pubescence on the 
hemielytra; the form of the posterior tibiz ; and the size and 
form of the caudal setze." 
Leidy gives a figure (Fig. 6) of the male genitalia of Belos- 
toma haldemanum, and describes the testes as “irregularly 
rounded masses, about two lines in diameter, . . . composed 
(each) of a single long convoluted tube. From the testicle 
passes off the vas deferens ; at first narrow, it gradually enlarges 
aS it passes backwards, is a little contorted, and finally joins 
the one of the opposite side to form the ductus ejaculatorius." 
Very probably Leidy assumed that these organs were similarly 
constructed in Zaitha, for he makes no reference to the latter 
in this regard. 
An examination of the male genital organs of Zaitha has 
Shown me that they are very different from those of Belostoma, 
as described by Leidy (I have not been able to procure Belos- 
toma for personal study). Some fifty malés of Zaitha were 
dissected by me recently (November and December), and the 
genitalia in all showed the following structure (Fig. B). Each 
testis (the testes are distinct from one another) is a large organ 
Composed of five capsules or follicles (2 and 3). Each capsule 
1s thickened in its anterior portion, but the posterior three-fifths 
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