CRAYFISHES. 361 



Paratype: — Silvies River, Burns, Harney Co., Oregon, Jul}^ 27, 1904, 

 J. O. Snyder coll., 19. U. S. N. M. 



This form bears the same relation to A. gnmbelii as A. leniusculus does to 

 A. trowbridgii. In the development of the posterior pair of post-orbital spines it 

 shows an affinity to ^4. nigrescens. It appears to be connected with A. gmnbelii 

 by intermediate forms. A large male upwards of 3j in. long in the U. S. National 

 Museum, collected at the mouth of St. Joe River, Coeur d'Alene Lake, Idaho, 

 has the long narrow rostrum and the elongated hand and fingers of A.g. connectens, 

 but the posterior pair of post-orbital spines are wanting, and specimens (also in 

 the U. S. National Museum) from Warm Springs, Harney Co., Oregon, in most 

 respects like typical A. gambelii, show traces of the posterior post-orbital spines. 



Dimensions of a male: — Length. 65 mm.; length of carapace, 34 mm.; 

 length of abdomen, 31 mm.; length of posterior section of carapace, 11 mm.; 

 width of areola, 5 mm.; length of chela, 31 mm.; breadth of chela, 7.5 mm.; 

 length of dactylus, 18 mm. 



ASTACUS LEPTODACTYLUS Eschscholtz. 



New locality:— Mys\owitz, Germany, 1893, Coll. Hofer, (U. S. N. M., No. 

 43,317) Icf. 



ASTACUS PALLIPES ITALICUS, Subsp. UOV. 



Plate 8, Fig. 2. 



In the Italian Crayfish as compared with the typical form of A. pallipes 

 from France, the margins of the rostrum are less convergent from the base to the 

 lateral pair of spines, so that the breadth of the rostrum between the lateral 

 spines is greater; the rostral acumen, too, is longer. The sides of the abdominal 

 segments end in a distinctly more acute angle. The chelae are more coarsely 

 granulated, the granulations or small tubercles separated by wider intervals. 

 The anterior process of the epistoma is more broadly triangular. The antennal 

 scale is larger, longer, and terminates in a more prominent spine. The tip of the 

 inner part of the gonopods of the male is produced l^eyond the tip of the external 

 part, whereas in A. paUipes the tips of the two parts are subequal. The telson 

 is relatively broader. 



Types:— U. S. N. M., No. 28,638, River Sarno, Pompeii, Italy, June 10, 

 1900, Dana Coolidge coll. 11 cf , 9 9 . 



