188 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 



parallel, more arched. They were lighter in color and more 

 distinctly marked than the males. These dit¥erenees are prob- 

 iibly only sexual. 



These sjoecimens appear to lie close to Pentidotea whitei in 

 many details, but in others are quite different. The male of P. 

 whitei is described as being much larger — 17 mm. by 34 mm. — 

 and about three times as long as wide, whereas the male of these 

 Laguna specimens is almost four times as long as wide. In 

 P. tvhitei the epimeron of the second segment becomes narrower 

 from the anterior to the posterior margin. Here the epimeral 

 suture is practically vertical and the epimeron is about as wide 

 anteriorly as posteriorly. The anterior margin of the head is 

 more distinctly excavate and the antero-lateral angles more 

 pronounced than in P. ivhitei. The eyes are about round, whereas 

 in P. whitei they are twice as wide as long. The last abdominal 

 segment is more elongate and the terminal process more pro- 

 nounced than in P. ivhitei. It therefore seems evident that tliis 

 isopod represents a new species. 



