14 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 119 



Cambarus longuliis chasmodactylus, new subspecies 



Cambarus Bartonii Hagen, 1870 (part), p. 76. — Faxon, 1885a (part), pp. 60, 61. 

 Cambarus longulus Faxon, 1890 (part), pp. 623, 624.— Ortmann, 1913 (part), 



pp. 335, 337, 375. 

 Cambarus longulus longulus. — Hay, 1899 (part), pp. 959, 966. — Hobbs, 1959 



(part), p. 898. 

 Cambarus bartonii longulus.— Harris, 1903 (part), pp. 58, 107, 138, 146, 148, 154, 



155, 159.— Faxon, 1914, p. 389, 390.— Newcombe, 1929, map, pp. 268, 278, 



280, 286. 

 Cambarus (Bartonius) longulus. — Ortmann, 1905 (part implied), pp. 120, 122, 



128, 129. 

 Cambarus (Cambarus) longulus longulus. — Ortmann, 1931 (part), pp. 106, 107, 



108, 118-121, 123, 128, 134-136. 

 Ca?n6an<s subspecies.— Johnson, 1957, pp. 178, 182; 1959, pp. 181, 183. 



Diagnosis. — Concoloroiis, blue green tinged with shades of cream 

 to rust. Rostrum with strongly swollen margins, without marginal 

 spines or tubercles, acumen tapering abruptly to uptiu-ned apex, with 

 a punctate depression posteromedially; length of rostrum 1.5-2.2 

 (average 1.9) times longer than wide; .69-1.1 (average 1.0) times 

 postorbital width and .17-28 (average .23) times carapace length. 

 Suborbital angle and branchiostegal spines absent, lateral spines 

 absent except in specimens from one locality in Carroll County, Va. 

 (map 2, no. 240); postorbital ridges and spines strong, cheeks with 

 scattered low tubercles. Areola 3.5-6.0 (average 4.4) times longer 

 than broad, length 34-37 (average 27) percent of length of carapace 

 and with 4-10 (average 6-7) punctations across narrowest part. 

 Antenna! scale 1.6-2.7 (average 2.2 times longer than broad), spine 

 strong. Inner margin of palm of chela with a row of squamous tuber- 

 cles, remainder smooth; all surfaces with scattered, deep punctations, 

 some on dorsal surfaces form linear rows. Palm broad, fingers of 

 adidts intensely gaping, meeting only at tips; immovable finger, sub- 

 triangular in cross section, with basal tuft of plumose setae, frequently 

 reduced or absent in adult forms (pi. ly,z) but present in all juveniles 

 (pi, U(;,a;); dactyl ovate to subcylindrical in cross section. Both 

 fingers with single row of low tubercles on opposable surfaces, single 

 tubercle near distal end of immovable finger often enlarged. "Hook" 

 of proximomesial angle in inner margin of palm weak or obsolete, 

 forming with carpus a deep weakly curved obtuse angle (pi. Izz: C); 

 length of inner margin of palm (pi. Izz: A) of fully extended chela less 

 than twice that of distance between spine of carpus and proximal 

 extremity of mner margin of palm (pi. Izz: B). Width of palm 

 .48-.74 (average .61) times length of dactyl, length of outer margin of 

 chela 2.6-4.7 (average 3.6) times length of inner margin of palm and 

 1,2-1.8 (average 1.6) times greater than length of dactyl. First 

 pleopod of first- and second-form males and annulus ventralis of fe- 



