ISOPODS OF NORTH AMERICA. 



229^ 



ANILOCRA PLEBIA Schioedte and Meinert. 



Anilocra pli'hia HcnuEDTK and Mkinert, Naturhistorit^k Tidpskrift (3), XIII, 

 1881-1883, pp. 145-146, pi. x, (ifr. 8.— Richakdson, Proc. U. S. Nat. Mus., 

 XXIII, 1901, p. 528. 



Localitiei^. — Shores of Costa Rica; Central America. 



Body elliptical, two or three times lono-er than wide (9:4). Head 

 moderately laroe, .subtrianoular, one-third as wide as the fourth 

 thoracic seg-ment, much wider than lono-. ver^' slightly immersed, the 

 front rounded in a circle. 



Eyes small, suboval, tumid, .separated by a distance of more than 

 half the width of the head. 



The iirst pair of antennae are straight, rather compressed, and 

 extend witli the two last articles to the anterior angle of the first 

 thoracic segment and to the sixth article of the 

 second pair of aiitiMuue; they are composed of eight 

 articles. 



The second pair of antennae are rather com- 

 [)ressed, are a little narrower than the first pair 

 of antenna\ and do not reach the posterior angle 

 of the first thoracic segment; they are composed of 

 nine articles. 



The anterior margin of the first thoracic seg- 

 ment is manifestl}' trisiimated, the lateral sinuses 

 being scarceh^ deeper than the median sinus. 



The posterior angles of the first six segments of 

 the thorax are scarcely or not at all produced, 

 being rounded or obtuse. The posterior angles of 

 the seventh segment are a little more produced and 

 rounded. The angles of the seventh segment do not reach by a small 

 distance the posterior angle of the first segment of the abdomen. 



The epimera are projecting. The first three are rather wide or 

 rather narrow, decreasing gradually in width, with the posterior mar- 

 gin widely rounded. The three posterior ones are narrow, subequal 

 in width, with the posterior margin narrow!}" rounded. The epimera 

 of the first and second pairs extend almost to tlie posterior angh^ of 

 the segment; those of the third pair do not reach by a small distance 

 the posterior angle of the segment; the fourth, fifth, and sixth pairs 

 of epimera are subeipud and do not reach by a large distance the pos- 

 terior angle of the segment. 



The first six pairs of legs gradually increase a little m length; those 

 of the last pair are manifestly longer and a little more slender than the 

 others. The unguis of the first pair are rather long and rather stout; 

 those of the second, thii'd, fourth, and fifth pairs are long or very long, 

 rather stout, sube(jual in length; those of the sixth pair are long or 



Fig. 232.— An I lock. \ 

 PLEBi,\ (After Schi- 



(ilDTE AND MEINEKT). 

 VoUNi; FEMALE. (EN- 

 LARGED.) 



