414 PROCEEDINGS OF THE NATIONAL, MUSEUM vol. S9 



sternum is modified into a small domelike structure that terminates 

 ventrally in a truncate spine, the latter flanked by two or three small 

 tubercles. 



Measurements. — The holotype: Carapace, height 1.30, width 1.24, 

 length 2.55 cm.; areola, width 0.13, length 0.79 cm.; rostrum, length 

 0.62, width 0.40 cm.; abdomen, length 2.99 cm.; right chela, inner 

 margin of palm 0.80, width of palm 0.84, length of outer margin of 

 hand 1.99, length of movable finger 1.08 cm. The allotype: Carapace, 

 height 1.18, width 1.15, length 2.31 cm.; areola, width 0.11, length 

 0.68 cm.; rostrum length 0.54, width 0.39 cm.; abdomen, length 2.77 

 cm.; right chela, inner margin of palm 0.56, width of palm 0.62, 

 length of outer margin of hand 1.46, length of movable finger 0.83 cm. 



Type locality. — A small creek about 7 miles northwest of Blounts- 

 town, Calhoun County, Fla., on State Highway No. 6. The water 

 had a slight brownish tint and flowed through dense growth of sub- 

 merged and emergent vegetation. The specimens were coUected on 

 April 17, 1937. 



The male holotype (form I) and the female allotype (No. 76594) 

 and a male paratype (form II) are deposited in the United States 

 National Museum. Of the paratypes, a male (form I), a male (form 

 II), and a female are deposited in the Museum of Comparative 

 Zoology; a male (form I), a male (form II), and a female in the Uni- 

 versity of Michigan Museum of Zoology; 5 males (form I), 10 males 

 (form II), 5 females, 37 immature males, and 43 immature females 

 are retained in tq.j own collection. 



Relationships. — Camharus kilbyi has its closest affinities with C. 

 barbatus and C. hubbelli. The absence of marginal spines on the ros- 

 trum, the relatively broad areola, and general body-build, which are 

 common to aU three forms, point to a rather close relationship be- 

 tween them. As in C. barbatus, hooks are present on the ischiopodites 

 of both the third and fourth pereiopods. The color pattern is almost 

 identical with that of C. hubbelli (i. e., a gray-greenish background 

 with a light cream mediodorsal stripe and a lateral stripe of the same 

 color on either side running the entire length of the body). The 

 absence of a barbate condition along the inner margin of the palm 

 of the chelae (in the male), however, distinguishes C. kilbyi. 



I take pleasure in naming this species for John D. Kilby, Resettle- 

 ment Administration, Montgomery, Ala., in appreciation of assistance 

 and companionship on numerous collecting trips. 



CAMBARUS RATHBUNAE, new species 



Figure 21 



Diagnosis. — Rostrum without spines. Areola moderately broad. 

 Maile with hooks on the ischiopodites of the third walking legs only, 

 and the chelae without beard along the inner margin of the palm. 



