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Show 650 MR. A. D. MICHAEL ON THE [Dec. 1, to any other with which I am acquainted; it is decidedly different from it. L. hilaris is a parasite of the Mouse. Colour light yellow-brown or bay. Texture fully chitinized, smooth, almost, but not really, polished. The whole dorsal surface is covered with fine irregular reticulations, which are much longer in the direction across the body than in that from rostrum to posterior end; their length in the former direction averages about twelve, and in the latter about fifty to the millimetre. No other markings. Shape subdiscoidal, but not actually so. The dorsal plate projects slightly over the rostrum ; the greatest breadth is about an eighth less than the greatest length; the body is a trifle narrower posteriorly than anteriorly, aud has a slight tendency to a rounded point posteriorly. The back is not strongly arched, the thickness in a dorso-ventral direction being small; it is, however, much greater in the anterior than the posterior part of the body. Mandibles of male,-I only found one adult male, and dissected this specimen; but the mandibles being very small and delicate, I unfortunately broke them before I could see them clearly. Fig 5 6 is a representation of the broken organ, from which I conclude that, when perfect, it would greatly resemble that of Lcelaps vacua (fig. 7 a). The whole dorsal surface is set with long, rather thick and conspicuous hairs, placed at almost regular intervals, but not exactly in rows. Ventral surface of female with ventral and genital plates united, the latter rounded anteriorly. The ventral plate large, almost touching the anal plate. Legs without apophyses, first pair much the longest, all terminated by claws and caruncles. Fourth pair set far forward, and in life usually held almost perpendicularly, and thus concealed beneath the body. Hab. Found commonly, but not abundantly, in the nests of Tetramorium ctfspitum, race meridionale, Emery, near Ajaccio in Corsica, frequently riding on the heads of the Ants. All those which I found, with the single exception above noticed, were females. I never saw one with mature eggs in it, and from this circumstance I doubted whether they were adult; they were, however, larger than the male, which certainly was adult, and they had the exterior genital opening well developed. I unfortunately was not aware that the male was the only specimen when I dissected it, and therefore I omitted to measure it. LCELAPS FLEXUOSA, n. sp. (Plate L. figs. 6-6 c.) 2 6 millim. millim. Length, about -53 '40 Greatest breadth, about -32 "24 Length of legs, 1st pair, about. . "40 "33 „ 2nd „ „ .. -27 '24 „ 3rd „ „ .. -25 -26 „ 4th „ „ .. -43 -39 |