298 H. Richardson — Isopods of the Bermudas. 



Jaeropsis rathbunae Richardson, sp. now 



Plate XL. Figures 53, 54, 55«, 556, 55c. 



Body elongate, depressed, segments loosely articulated ; surface 

 smooth ; color uniformly light, almost white. 



Head with a median excavation, on either side of which the fron- 

 tal margin is produced into angulations. On either side of these 

 angulations is another excavation, on the outside of which are lateral 

 angulations. A rounded lobe is placed in the median excavation. 

 The eyes are small and are situated near the lateral margins about 

 half way between the anterior and posterior margins. The first pair 

 of antennae consist of five joints, the two first joints being large, the 

 three following ones small, the last fringed with hairs. The second 

 pair of antennae have a rudimentary flagellum, consisting of five or 

 six joints ; the peduncle has the third and fifth joints long and oval 

 in shape, the fourth joint somewhat triangular. 



The thoracic segments are loosely articulated. The lateral mar- 

 gins are straight, with no indication of epimera. 



The terminal segment of the body is rounded in outline, the pos- 

 terior margin excavated at the insertion of the uropoda, which do 

 not extend beyond the edge of the segment, thus preserving the oval 

 outline. Between the uropoda there is an acute median projection. 



The legs are all simple, with biunguiculate dactyli. 



One specimen was collected by A. E. Verrill and party at the 

 Bermudas, and another by G. B. Goode, from the same locality. 



Type specimens in Peabody Museum, Yale University. Cat. No. 

 3251. 



Six species of this genus have been heretofore described : Jo2roj>- 

 sis lobata Koehler, Jaeropsis marionis Beddard, Jceropsis neo-zealan- 

 dica Chilton, Jihropsis lobata Richardson, Jceropsis Dollfusi Nor- 

 man, and Joi-opsis curoicoruis (Nicolet).* The present species adds 

 another to the above list. It is named in honor of Miss Mary .1. 

 Rathbun. 



* Jcera eurvicornis Nicolet, in Gay's Hist, de Chile, iii. p. 263. Zool. Atlas, 

 Crust., No. 3, fig. 10, 1849. This species should be referred to the genus 

 Jceropsis. 



