CRAYFISHES. 389 



is most susceptible to the action of the hquicl. After some hours the red colour 

 extends over the whole branchial region and for a time is sharply defined from 

 the median areola and the other parts of the body, which still retain the dusky 

 colour of the living animal. These striking colour-patterns resulting from 

 recent iimnersion in alcohol might easily be mistaken for natural life colours by 

 one who had not witnessed the change, and it suggests the probability that some 

 writers have been misled into describing such colours as those of the living animal. 

 Randall, for instance, in the Journal of the Academy of Natural Sciences of Phila- 

 delphia, 8, p. 138, PI. 7, describes and figures Astacus oreganus (= A. lenius- 

 culus Dana?) as having a red spot on each side of the carapace, quite similar to 

 the red spot which temporarily shows in Cambarus b. robustus recently immersed 

 in alcohol. So, too, the wliitish or lenion-yellow spot on the branchiostegites of 

 Parastacus bimaculatus Phihppi (Anales Universidad Chile, 87, p. 378), which is 

 probably the same species that I described under the name Parastacus agassizii 

 {cf. the colour description of this species by Prof. Carlos E. Porter in Revista 

 Chilena de Historia Natm-al, 8, p. 258, pi. 9, fig. b) may possibly be the result 

 of the action of alcohol on freshly killed specimens. 



Cambarus bartonii longulus (Girard). 



New localities: — West Virginia: West Fork of Greenbrier River, near 

 Dui-bin, Pocahontas Co. (U. S. N. M., No. 23,992) ; Bluestone River, Abb's Valley 

 (U. S. N. M., No. 28,618). 



In normal specimens of this subspecies the sub-orbital angle is hardly if at 

 all prominent. The individuals wWch I mentioned in Proc. U. S. N. M., 12, 

 p. 623, as ha\'ing the orbit sharply defined below by a prominent angle may prove 

 to be, I suspect, C. bartonii longirostris. This form is not very well known as yet, 

 and I ha\'e reason to think that it acquires with maturity a claw very much like 

 that of C. bartonii longulus. The character of the sub-orbital margin of the 

 carapace seems to be very constant within the limits of a good subspecies, and 

 it may prove to be the really diagnostic feature for separating C. b. longulus and 

 C. b. longirostris. 



Cambarus bartonii veteranus, subsp. nov. 



Plate 13, Fig. 2. 



Rostrum long, without lateral teeth, margins elevated, strongly convergent, 

 acumen triangular, terminating in an uptm'iied corneous tooth. Antero-Iateral 



