RHYSIDA,. 27 
spine ; sternite broad, a little narrowed posteriorly, with lightly convex sides and an emarginate hinder 
border ; legs long and slender, femur unarmed ; tarsus not spined, claw with basal spurs. 
Legs: first to seventeenth or eighteenth with two tarsal spurs, nineteenth and twentieth with one tarsal spur ; 
first to the sixth with an anterior tibial spur ; the first with an anterior patellar spur. 
Length 52 millim. 
All the names given above in the synonymical list were applied to examples from 
different parts of the Oriental Region. The characters, however, upon which the 
so-called species were established do not seem to be reliable. The Banda form, 
ft. gymnopus, which has the anal femur unarmed and the pleure tipped with two 
spines, is identical with the Central-American examples here recorded ; and R. gymnopus 
is connected with the typical A. immarginata by means of R. ceylonica, which has a 
few spines on the femur. 
2. Rhysida celeris. 
Branchiostoma celer, Humb, & Sauss. Rev. et Mag. Zool. (2) xxii. p. 202 (1870) *; Mém. Mex. 
Myr. in Mém. Soc. Phys. Genéve, xv. p. 122, t. 6. fig. 16°; Kohlr. Arch. f. Naturg. 1881, 1, 
p- 69°; Meinert, Proc. Am. Phil. Soc. 1886, p. 183 *. 
Colour pale green or olivaceous, flavo-brunneous or ochraceous beneath; feet, except the posterior, and 
antenne flavo-brunneous. 
Body tolerably slender or more robust, nearly smooth. 
Head suborbicular, immarginate, its posterior margin more or less covered. 
Antenne tolerably short, 20 (18-21) segments; except the first three segments, densely and shortly hairy, the 
median segments long or longish. 
Prosternal teeth four on each side, arranged in pairs, somewhat blunt; coxal tooth almost smooth. 
Anal legs very long, slender, unarmed. 
Dorsal lamine, except the first four, marginate. 
Posterior pleure manifestly rough, thickly porous, produced into a smooth, sharp angle, which is terminated by 
two spines. 
Last ventral lamina tolerably wide, narrowed and with rounded sides, posteriorly manifestly sinuate. 
Length 70 millim. 
Hab. Norta America, Carolina }—Nicaracua, Polvon* (McMiel).—Antiuxs, 
Jamaica *. 
Recorded originally from Carolina by Saussure, but subsequently from Jamaica and 
Nicaragua by Meinert. 
This species is unknown to me, but, apparently differs from 2. ¢mmarginata in having 
some of its tergites margined. 
3. Rhysida longipes. (Tab. II. fig. 11.) 
Branchiostoma longipes, Newp. Trans. Linn. Soc. xix. p. 411 (1845)'; and of later authors. 
Hab. Mexico, Mazatlan (forrer).—AntiLLes.—E. InpIEs. 
This species has a wide range in the tropics, being not uncommon in both the East 
and West Indies. 
Since two or three good descriptions of 2. longipes have been published of late 
years, it is unnecessary to redescribe it here. 
