NO. 1136. OUSERVATIOXS OX THE ASTACIDA:— FAXON. (If)! 



GROUP IV. (Type, Astaciis affinis Say.) 



Third segment of third pair of legs of male liooked. First abdominal 

 ai)i)endages of male biiid, terminating in two styliform branches, wliicU 

 are straight or lightly recurved. 



CAMBARUS LANCIFER Hagen. 



Canihariis lancifrr Hagen, Moiiogr. N. A. Astacid;p, p. 59, pi. i, fliis. 86, 87; pi. 



Ill, fig. 159, 1870 (male. Form I). 

 Camharus faxonii Mekk, Amer. Nat., XXVIII, p. 1042, figs. 1-4, 1894 (male. 



Form II). 



In 1891 Mr. W. P. Hay sent me a female specimen of C. laneifer col- 

 lected at V^icksburg, Mississippi. Up to that time Doctor Hagen's 

 type specimen had remained unique. Mr. Hay's specimen differed from 

 the type in having a median spine on the inner side of the carpus of 

 the chelipeds. In the '•'American Naturalist " for December, 1894:, Pro- 

 fessor S. E. Meek described and figured the second form of the male 

 under the name of Camhartis faxonii . Professor Meek's specimens were 

 taken in bt. Francis Eiver at Greenway and Big Bay, Arkansas. 

 Seven (four males, Form II; three females) have been presented to the 

 Museum of Comparative Zoology ilSo. 4220). In the second form of 

 the male the tips of the first pair of abdominal appendages are not 

 horny, as in the first form ; the inner and outer branches are of about 

 ecjual length, the inner tapering to a rather sharp, straight point, the 

 outer blunt and rounded. These appendages are cleft only for a short 

 distance from the tip, and so present a form very similar to that seen 

 in Groups I and II. The annulns ventralis of the female is depressed 

 in front, more prominent and unituberculate behind, with a closed, 

 curved fissure. 



The areola is very incorrectly represented in Meek's fig. 1. The are- 

 ola is entirely obliterated in the middle, not open as there portrayed. 



CAMBARUS INDIANENSIS W. P. Hay. 



Camharus affinis, var. Faxon, Proc. U. S. Nat. Mns., XXII, 1890, p. 628. 

 • Camharus iiidiaiunsis Hay, 20th Ann. Rep. Dept. Geol. Indiana, p. 494, fig. 9, 

 1896. 



This form, which I considered as a Western race of Camharus affinis., 

 has been described as a distinct species by Mr. Hay. It has been found 

 in the Patoka lliver at Patoka, Indiiina, and at Huntington, Dubois 

 County, Indiana. 



CAMBARUS SLOANII Bundy. 



Madison and Marengo, Indiana {Jide W. P. Hay). 



CAMBARUS PROPINQUUS Girard. 



Lake Douglas and Saginaw River, Michigan; Indian Lake, Water- 

 loo, Indiana; Portage River at Oak Harbor, Ottawa County, Ohio. 

 (CoU.U.S.N.M.) 



