Me. E. J. MIEES on the IDOlEIDiE. 3^ 



third joiiit of the peduncle of the autenute. Autenna?, when re- 

 tracted, reaching to about the posterior margin of the fourtli 

 thoracic segment ; flagellum about 15-jointed and shorter than 

 the peduncle. Epimera of the second to fourth thoracic seg- 

 ments occupying scarcel}'- more than the anterior half of their 

 lateral margins, of the fifth and sixth segments about tliree 

 quarters, and of the seventh segment the whole of the lateral 

 margins. Colour very variable : back reddish brown or olive- 

 green, often with yellow clouded or dot-like markings, or even 

 with a yellowish stripe on the back. 



This species was obtained by Middendorff in the Sea of Ochotsk, 

 and by Wosnesensky in Awatscha Bay. Its j ange, as far us 

 ascertained, extends along the eastern coast of Asia northward 

 I'rom the Sea of Japan, and along the west coast of N. America 

 southward to British Columbia and Vancouver Island. 



A fine male in the British-Museum collection, length nearly 1| 

 inch (43 mm.), j)reserved in spirits, and collected by Capt. St, John 

 ofi" the N-E. of Yedo Island (J. Gwyn Jeffreys), differs from 

 Brandt's figure of /. ocliotensis only in its relatively longer and 

 slenderer body and somewhat shorter antennae, which, when re- 

 tracted, would not reach to the posterior margin of the fourth 

 thoracic segment, but whose peduncular joints are longer than iu 

 Brandt's figure ; the flagellum is I3-jointed. 



On the other hand, a male of smaller size, in spirit, from 

 British Columbia (J. Iv. Lord), length about Ij^^" i^ch (28 mm,), 

 much more nearly resembles Brandt's figures in these par- 

 ticulars ; but the keel-like elevation of the median dorsal line 

 of the thorax is obsolete ; the fiagellum of the antennte is 18- 

 jointed. 



In a small examj)le (in spirit), length nearly | inch (18 mm,), 

 obtained at Yancouver Island (Boundary Commission), the an- 

 tennae are yet longer, reaching beyond tlie posterior margin of 

 the fifih thoracic segment, the flagellum longer tlian the peduncle 

 and 19-joiiited, the dorsal keel of the thorax and terminal seg- 

 ment is obsolete, and the tooth at its distal extremity, which is 

 veiy prominent in tlie large male from Japan, but less so in the 

 sptcimen next referred to, is in this quite obscurely defined. 

 Having regard to the marked variations which exist between the 

 adult and young of seme other species (e,g. /. marina), I will 

 reier all three specimens, provisionally at least, to 1. ochotensis 

 rather than incur the possibility of further complicating the syno- 

 nymical references in this geuus by unnecessary specific names. 



LINN. JOUBN. — ZOOLOGY, VOL. XVI. 3 



