ISOPODS OF NORTH AMERICA. 



467 



IOLELLA SARSI, new species. 



Body twice as wide as long, 5 mm. : 10i mm. ; surface densely cov- 

 ered with short, stiff hairs. 



Head wider than long, 2 mm.: 3 mm. Front without rostrum; 

 anterior margin nearly straight, with only a small, median obtuse 

 point. Lateral margins produced in an anterior lobe bearing three 

 feeble spines and a smaller, almost inconspicuous lobe also armed with 

 three feeble spines. Antero-lateral angles rounded. Eyes moderately 

 large, round, composite, situated close to the lateral margins. The 

 first pair of antennae have the basal article of the peduncle large and 

 dilated; the second article is half as long and about half as wide; the 

 third article is a little longer than 

 the second. The flagellum is com- 

 posed of numerous short articles. 

 The second pair of antennae are 

 broken at the fourth article of the 

 peduncle, and the distal parts are 

 lost. There is a distinct scale out- 

 side the third article. The articles 

 of the peduncle, as well as the an- 

 tennal scale, are beset with spines. 



The tirst segment of the thorax 

 has both the anterior and the pos- 

 terior angles produced in long, nar- 

 row processes, with the epimeron, 

 consisting of a single, narrow pro- 

 cess, situated between the two. 

 The second and third segments of 

 the thorax have the anterior and the 

 posterior margins produced into 

 long, narrow processes, with the 



epimeron, consisting of two long processes, situated between the two. 

 The fourth segment has the anterior portion only produced in a long, 

 narrow process, with the epimeron produced in two processes, and 

 situated in the posterior emargination of the segment. The fifth, 

 sixth, and seventh segments have the anterior part produced and 

 gradually increasing in width, with the epimeron situated in the pos- 

 terior emargination of the segment. The lateral processes of the 

 segments, as well as the epimera, are beset with spines. 



The abdomen consists of a large terminal segment, with two short 

 segments anterior to it, evident onlv in the middle part, being covered 

 at the sides by the seventh thoracic segment. 



The terminal segment is broader than long, 3 mm.: ^ mm. The 



FIG. 523. IOLELLA SARSI. 



