Characters of the Chigoe or Jigger. 203 Species 1. Sarcopsylla lienctrans, Linn. Bicho de Pe. Plate XX. Fig. 3. Fig. 3 a, female natural size; 3 6, ditto magnified, distended with eggs; 3 c, head and prothorax ; 3 (/, maxillary palpus; 3 e e, mandibles; 3^', lingua; 3 g, labium ■? 3 /;, one of the feel ; 3 i, part of the coil of eggs ; 3 k, ditto nearer to the anal orifice ; 3 I, one of the eggs opened. Species 2. Sarcopsylla can'is, Westw. Biclio de Cachorro. Differentiae specificse baud determinatae. Obs. — Since tbis memoir was read, M. Diiges bas piibbsbed a memoir on tbe Jigger, in tbe Annales des Sciences Naturelles for September, 1836, in wbicb he bas traced tbe organization of gravid females, but has not considered it proper to separate it generically from tbe genus Pulex. M. Guerin, also, in his Iconographie du Rkgne Anirtial, (Insectes, pi. 2), bas given figures of tbe insect in various states. His figures 9 and 9 a represent a specimen with the abdomen of tbe ordinary small size, and terminated by a long furcate instnmient, composed of five pieces (fig. 9yand 9^), and wbicb in his descriptive text (for proof sheets of the first part of which I am indebted to him) he regards as a male, with exserted organs of generation, considering that the forked appendage can-not be an ovipositor, and consequently that tbe individual must be a male. His figure 9 6 represents a female, with tbe abdomen distended as in my figure ; and in bis text he proposes the ge-neric name of Dcrmatophilus for tbe insect. XLI. Description of a minute Crustaceous Animal from the Island of Mauritius, By Uobert Templeton, Esq. R,A. [Read 4th April, 1836.] Class CRUSTACEA, Brisson. Lam. Sub-class Malacostraca, Latrcille. Order Amphipoda ? Latreille. Genus novum, Zeuxo. Aideimce 4, breves, subeequales, spinis armatae ; superiores, 3-ar-ticulatae, articulo Imo multo majore ; inferiores indivisae, 5-articulatae, articulo ultiino valde minuto. OcuU duo : antennis snpcrioiibus conligui, in squaniis subtriangu-laris capite ailiculalis immersi.