No. 400.] REVIEWS OF RECENT LITERATURE. 327 
= 
are frequent. The Coleoptera are said to include over eleven thou- 
sand species; a statement that is true, but surely an unhappy way of 
recording that more than eleven thousand beetles are credited to 
America, north of Mexico; the larvz of some snout beetles have jointed 
legs; the firefly, with luminous thoracic spots, is incorrectly placed in 
the Lampyride ; the Hercules beetle is not the largest true insect; 
more than one Termite is found in North America, and the northern 
range of the species credited to that region is far beyond Massachu- 
setts; all tropical Phasmidz do not have wings that look like leaves. 
The repetitious character of the text is especially tiresome, and the 
list of books for reference wholly inadequate. 
Finally, the illustrations are very evenly bad; it would take much 
search to find a more atrocious series. Figs. 89 and g2 are trans- 
posed. S. H. 
Sheep Tick. — The gross anatomy and histology of the female. 
genital tract of Melophagus ovinus are described in detail by Pratt 
(Zeitschr. f. wiss. Zool., Vol. LXVI, pp. 16-42, Pls. II, III), complet- 
ing and extending the work of Leuckart (1858). Each ovary consists 
of two ovarioles, possessing two follicles apiece, and both ovaries 
and ovarioles alternate in the production of the ova. From the 
germarium are produced follicular, nutritive, and egg cells; while 
the ovarioles are similar to those of Musca, and the peritoneal cover- 
ing of the ovary is peculiar only in its thickness and extent. The 
fused proximal portions of the oviducts form a median vessel serving 
as a receptaculum seminis and lying in the virginal female in a plane 
perpendicular to that of the uterus, later at an acute angle to it. 
The ducts of the two pairs of milk glands, which provide nourish- 
ment for the larva during intrauterine development, open by a single 
opening into the uterus; the anterior of the two pairs is more or 
less rudimentary. The structure of the vagina is such as to permit 
of extreme distention at the time that the fully developed larva is 
extruded. R. H. Worcorr. 
Nauplius Stage of Penzeus. — Although F. Müller announced as 
early as 1863 that Penæus emerged from the egg in its nauplius 
stage, this statement remained unconfirmed, notwithstanding the 
fact that Penzeus has been studied by several investigators, till the 
past year when Kishinouye! rediscovered this stage in material col- 
lected on the Japanese coast. 
! Kishin ouye, K. On the Nauplius Stage of Peneus. Zool. Anz., Bd. xxiii, 
PP- 73, 74, 3 Figs., 1900. 
» 
