366 MEMOIRS OF THE CARNEGIE MUSEUM 
I possess five specimens (obtained by exchange from Oberlin College) from one 
of the two localities originally mentioned by Faxon for this form (Oberlin, Ohio), 
which agree well with his account, with the exception that the pubescence of the 
hands is not developed ; there are, indeed, a number of short hairs in some, chiefly 
the younger, specimens, implanted in the punctures, but such are also very fre- 
quently present in C. propinquus (as well as in C. obscwrus). These hairs are gener- 
ally present in new, recently moulted specimens, but wear off with age. 
The male copulatory organs are very similar in shape to Faxon’s figure, although 
they vary slightly with reference to the length of the separated tips. In this 
respect, however, the variety is closer to the typical form than to C. obscurus. In 
addition, I notice in the two males of the first form of this set that the inner part of 
the male organs, although it tapers to a point on a side view, is different on a poste- 
rior view. From behind it is broadly and bluntly rounded off, a fact which is due 
to a marked compression and flattening in an anteroposterior direction toward the 
tip. This is also the case in the male of the second form at hand. Here both tips 
of the sexual organs are blunt, that of the inner part less so than that of the outer. 
I cannot see that the tips of the male organs, either in the first or in the second form, 
are closer together than in C. propinquus. 
The armature of the chelipeds in these specimens is slightly different from that 
of the typical C. propinquus, although similar variations have been observed in the 
latter. In all five specimens there are two distinct spines on the lower side of the 
carpopodite, one at the articulation with the hand, the other on the anterior margin. 
The inner margin of the carpopodite, besides the one strong spine, has a distal and 
a proximal tubercle, and in the two largest individuals (male and female) there are 
a few additional tubercles on the upper surface of the carpopodite. The inner lower 
margin of the meropodite invariably has in these specimens behind the distal 
spine a row of small teeth, becoming spiniform in the larger individuals. The num- 
ber of teeth in this row is from six to eight. In two specimens the outer lower margin 
possesses a small tubercle behind the distal spine of each cheliped. In one specimen 
there is only a tubercle on the right side, and two others have only the distal spine. 
In addition to the above specimens from Oberlin I have seen among the Oberlin 
collections other specimens from the state of Ohio, and have myself collected in 
eastern Ohio and northern West Virginia a number of specimens, which undoubt- 
edly belong to the same form. The characters are practically the same, and only a 
few remarks are necessary. 
1. The keel of the rostrum is invariably lacking. There is not a single indi- 
vidual which shows any trace of it. 
