308 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



of eyes will further distinguish it from Platyarthrus, which is often 

 found inhabiting ants' nests, but would hardly be likely to occur in the 

 sand of the beach. 



Body elliptical, pleon not abruptly narrower than the thorax, dorsal 

 surface roughened throughout with small depressed tubercles each giving 

 rise to a minute spiuule. Head transverse, not lobed ; eyes prominent, 

 round 5 antennae longer than the breadth of the body ; with the first and 

 second segments short ; third, fourth, and fifth successively longer and 

 of less diameter ; flagellum shorter than the fifth segment, composed 

 of three closely articulated, successively smaller segments, and a very 

 short somewhat spiniform but obtuse terminal one ; all the segments, 

 except the minute terminal one, beset with small scattered spinules. 



First thoracic segment scarcely embracing the head at the sides ; sec- 

 ond, third, and fourth segments each about as long as the first, but in- 

 creasing in breadth ; fifth, sixth, and seventh diminishing in length and 

 the last two also in breadth. Posterior lateral angles of the first three 

 segments not at all produced, hardly perceptibly produced in the fourth 

 segment; fifth, sixth, and seventh with the angles increasingly produced 

 but not acute. Legs increasing somewhat in size posteriorly, armed, 

 especially on the inferior surface of the nieral, carpal, and propodal seg- 

 ments, with short stout spines. 



Segments of the pleon with the coxos but little developed. Ter- 

 minal segment slightly rounded at the end, not attaining the end of 

 the basal segment of the uropods, which are robust, with the basal 

 segment spiuulose, tapering to the base of the short, stout, outer ramus, 

 and bearing the more slender inner ramus much nearer its base. The 

 inner ramus is actually longer than the outer, but being inserted much 

 lower down does not attain the tip of the outer ramus ; both are tipped 

 with setae. 



" Color, in life, nearly white, with chalky white spots, and scattered, 

 blackish dots arranged irregularly. Eyes black." Length 3.4 mm . 



This species was " found at Somers and Beesley's Points, on Great 

 Egg Harbor ! , New Jersey, in April, 1871, burrowing in the sand of the 

 beaches, just above ordinary high- water mark, in company with sev- 

 eral species of Staphylinidce," and has also since been found by Pro- 

 fessor Smith at Nobska Beach, Vineyard Sound ! , Mass., in 1871, and by 

 Mr. Y. 1ST. Edwards, on the beach at Nantucket Island ! , December 6, 

 1877. It will doubtless be found at other points along the coast and 



toward the south. 



Specimens examined. 



