NO. 1894. 



ISOPODt^ FROM JAMAICA— RICH ARD,SON. 



193 



^■^^\_^^ 



Family ARIVIADILLIDID^. 



CUBARIS JAMAICENSIS, new species. 



Body ovate, nearly twice as long as wide, 9^ mm. by 5 mm. Head 

 and dorsal portion of the thoracic segments covered with low tuber- 

 cles. The tubercles on each segment are arranged in a transverse 

 row of four about tlie middle with a group on 

 either side of about nine. On the first segment 

 the lateral groups are composed of about eleven 

 tubercles, and there are also two low tubercles 

 on the anterior portion of the middle dorsal 

 region, one on either side of the median line. 

 There are two tubercles on the terminal ab- 

 dominal segment, one on either side of the 

 median line at the base of the segment. The 

 color is brown, with a median row of light spots, 

 one on the anterior portion of each segment. 

 There is also a group of light spots on each 

 segment under the lateral group of tubercles. 

 The head is wider than long, 2h mm.: 1mm., 

 with the frontal margin straight and forming 

 a narrow border. The eyes are small, round, 

 and composite. The first pair of antennae are 

 rudimentary and inconspicuous. The second 

 pair have the first article short; the second 

 about three times as long as the first ; the third about twice as long 

 as the first; the fourth is about as long as the second; the fifth is 

 a little longer than the fourth. The flagellum is composed of two 

 articles, the second of which is about three times 

 as long as the first. The prosepistoma is flat. 



The first segment of the thorax is about twice as 

 long in the median line as any of those following, 

 which are subequal. The lateral parts of this seg- 

 ment are upturned, the dorsal surface being concave. 

 The lateral parts of the second, third, and fourth 

 segments are produced in narrow processes with 

 rounded extremities. The lateral margins of the 

 last three segments are nearly straight. Coxopo- 

 dites are present on the first two segments on the 

 under side. On the first segment they occupy only 

 the posterior half of the lateral margin and are 

 smaller than the lateral part of the segment, being 

 narrower and shorter. The coxopodites of the second segment are 

 small dentiform processes, obliquely placed some distance from the 

 lateral margin. 



Fig. 2.— Cub.\ri3 jamaicensis. 

 X 6|. 



1 IG. 3.— CUBARIS JAMAI- 

 CENSIS. Under side 

 OF HEAD AND HRST 

 TWO SEGMENTS OF 

 THORAX SHOWING COX- 

 OPODITE.S. 



20441°— ProcN.M. vol.42— 12 13 



