CRAYFISHES. 361 
Paratype:— Silvies River, Burns, Harney Co., Oregon, July 27, 1904, 
J. O. Snyder coll.,1 9. U.S. N.M. 
This form bears the same relation to A. gambelii as A. leniusculus does to 
A. trowbridgii. In the development of the posterior pair of post-orbital spines it 
shows an affinity to A. nigrescens. It appears to be connected with A. gambelia 
by intermediate forms. A large male upwards of 3¢ in. long in the U. 8. 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. gambelvi, 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:— Myslowitz, Germany, 1893, Coll. Hofer, (U. 5. N. M., No. 
43,317) 12. 
ASTACUS PALLIPES ITALICUS, subsp. nov. 
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 beyond the tip of the external 
part, whereas in A. pallipes 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. 117,92. 
