15G r.NTOMOSTRACA. FRO^t OOMMANDeG ISLANDS. 



longer than the two next segments combiiUMl. and for the second caudal 

 segment being rndimentary. In addition it may be noted that the lirst 

 pair of antenna', reach to the end of tlie fnrca and have twenty-six joints ; 

 that the hist (sixth) thoracic segment, seen from above, terminates in a 

 point and possesses a stnall spine in the posterior border; that the tirst 

 caudal segment in its anterior portion has a quite small spine on each 

 side; that thefarcais short, being about the same lengtli as the last 

 caudal segment; that the inner branch of the fifth pair of feet has only 

 one joint, tlie tip of which is provided with two strong spines and only 

 a trace of a third one, and tiiat it hardly reaches to the end of the first 

 joint of the outer branch; that the great spine on the second joint of 

 the outer branch has extremely small spines only on the middle of the 

 inner side, and that itsthird joint is indistinct and possessestwo spines, 

 of wliich the larger one reaches to or beyond tlie middle of the above- 

 mentioned large spine on the second joint. In other respects it presents 

 the usual features of the genus. 



Of this species Mr. Stejneger only obtained a couple of fully-developed 

 females, besides a few specimens not yet developed. 



According to his notes it was collected July 22, 1882, in a small fresh- 

 water pond at Ladiginsk, near the main village on Bering Island. 



Collector's No. 1271 : U. S. Nat. Mus. No. 12437. (Types.) 



Upsala, Sweden, March 8, 1887. 



