DESCRIPTION OF A KEW SPECIES OF SUBTEKRANEAI^ 



ISOPOD. 



By W. P. Hay, M. S., 



Central High School, Washinijlon, 1>. C 



Forty or fifty specimens of an interesting and apparently nndescribed 

 Isopod were obtained from an old well in Irvington, Marion County, 

 Indiana. They were evidently strictly aquatic. The pump in the well 

 drew water from the bottom, and the animals could be obtained only by 

 vigorous work. After capture they lived for some hours in a jar of 

 water, crawling about on the bottom, very much after the manner of 

 Asellus. While in the water the pleopods could be seen to be gently 

 moved up and down with a fanlike motion. Several of the females 

 carried eggs, six or eight of which were sufficient to till the brood 

 pouch. 



The nearest relatives of this species are Kaplophthalmus mengii 

 (Zaddach) and H. danicus Budde-Lund, both of which are inhabitants 

 of moist situations, such as decaying leaves and wood, in various locali- 

 ties in Europe. It is also closely related to Scyphacella [Haplophthal- 

 musf) arenicola S. I. Smith, which has been found burrowing in the 

 sand in a number of localities along the Atlantic coast of North 

 America. 



HAPLOPHTHALMUS PUTEUS, new species. 



Male. — Body elliptical, length about three times the breadth, dorsal 

 surface strongly convex, covered with longitudinal rows of low tuber 

 cles and scattered sette. Segments of the perteon about equal in length, 

 the posterior pleural angle of all, except the first, more or less pro- 

 duced backwards. PleuriB of third, fourth, and fifth segments of the 

 pleon thin and directed backwards and outwards. Terminal segment 

 of abdomen notched behind and with the postero lateral margins con- 

 cave. Uropods exserted, short, outer ramus longer than inner; both 

 rami setose. Front margin of head very slightly produced. Antennae 

 longer than the greatest breadth of the body; first and second seg- 

 ments of medium length, third short, fourth and fifth long, flagelliim 

 sliort, pinniform, composed of three very small, closely articulated seg- 

 ments. Antenn;e geniculate between segments four and five. Anten- 

 nules minute, composed of three segments, entirely concealed by the 

 front of the head, sensory filaments five. Eyes small, simple. Upper 

 lip regularly rounded in front and with a median triangular patch of 



Proceedings U. S. National Museum, Vol. XXI— No. 1 176. 



871 



