652 PROCEEDINGS OF THE NATIONAL MUSEUM. 



G. propinquus is probably the most abundant crayfish in Indiana, 

 according to Mr. W. P. Hay. 



CAMBARUS OBSCURUS Hagen. 



Westmoreland County, Pennsylvania (Coll. U.S.N.M.). 



In the female of Gambarus obscurns the anterior part of the annulus 

 ventralis is prominently bituberculate, and behind the tubercles there 

 is a deep transverse fossa. The organ thus has a very different form 

 from that of C. propinquus. This difference, together with the pecul- 

 iarity of the sexual appendages of the first form of the male, 1 supports 

 Doctor Hagen's view that G. obscurus is a species rather than a local 

 race of G. propinquus. as I considered it in my "Revision." 



CAMBARUS NEGLECTUS Faxon. 



Day Brook, Jasper County, Missouri (No. 4341, Mus. Comp. Zool .); 

 James Piver, Springfield, Missouri (Coll. U.S.N.M.). There are speci- 

 mens of Cambarus neglectus in S. E. Meek's collection from the following 

 new localities: Turkey Piver, Fort Atkinson, Winneshiek County, 

 Iowa; Neosho, Newton County, Missouri; Spring Creek, Johnson, 

 Arkansas; Prairie Grove and Fayetteville, Washington County, Arkan- 

 sas; Batesville, Independence County, Arkansas; Ped River, Arthur, 

 Texas. 



CAMBARUS VIRILIS Hagen. 



Jasper County, Missouri (No. 4328, Mus. Comp. Zool.); Spirit Lake, 

 Dickinson County, and Ames, Story County, Iowa (Coll. U.S.N.M.); 

 Lake Douglas, Michigan (Coll. U.S.N.M.). In S. E. Meek's collection 

 G. virilis is represented from the following localities: Storm Lake, 

 Buena Vista County, Iowa; Cherokee, Cherokee County, Iowa; Yellow 

 Creek, Postville, Allamakee County, Iowa; Spring Creek, Delhi, Dela- 

 ware County, Iowa; Boyer River, Arion, Crawford County, Iowa; 

 Belmond, Wright County, Iowa; Shell Rock River, Waverley, Bremer 

 County, Iowa; Neosho, Newton County, Missouri; Blue River, Crete, 

 Saline County, Nebraska; Prairie Grove and Fayetteville, Washington 

 County, Arkansas; McAlister, Indian Territory (one female, var. A); 

 Red Piver, Arthur, Texas. 



In Indiana G. virilis is confined, according to Mr. W. P. Hay, to the 

 noi thern part of the State, where it is extremely numerous. 



Specimens from Big Piney Creek, Cabool, Texas County, Missouri 

 (Coll. U.S.N.M.), differ in many particulars from the typical form. The 

 cephalo thorax is more cylindrical, the chehe shorter, with more inflated 

 hand and shorter fingers, the immovable finger narrower and less flat- 

 tened ; there arc one or two additional spines on the lower side of the 

 < arpus between the median and internal spines; the rami of the male 

 seNual appendages are longer, slenderer, and less strongly curved. In 

 the shape of the hand these individuals are very similar to those col- 



1 Rev. Astacidsu, p. 93. 



