650 MR. A. D. MICHAEL ON THE [DcC. 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 

 aveiages about twelve, and in the latter about fifty to the millimetre. 

 No other markings. 



Shape subdiscoidal, but not actually so. The dorsal plate pro- 

 jects 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, and 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 h 

 is a representation of the broken organ, from which I conclude that, 

 when perfect, it would greatly resemble that of Lailaps vacua 

 (fig. 7 a). 



The whole dorsal surface is set with long, rather thick and con- 

 spicuous 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. 



Hah. Found commonly, but not abundantly, in the nests of 

 Tetramorium ctespitum, race meridionale, Emery, near Ajaccio in 

 Corsica, frequently riding on the heads of the i.\nts. 



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 ; thev 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. 



L^LAPS FLEXTJOSA, n. sp. (Plate L. figs. 6-6 c.) 



ruillim. millim. 



Length, about -53 "40 



Greatest breadth, about -.32 '24 



Length of legs, 1 st pair, about. . -40 '33 



„ 2nd „ „ .. -27 -24 



„ 3rd „ „ .. -25 -26 



» 4th „ „ .. -43 -39 



