NEW CRAYFISHES FROM FLORmA — HOBBS 423 



II), five females, and one immature male have been retained in my 

 own collection. 



Relationships. — Cambarus pictus probabl}'" has its closest affinities 

 with C. pubescens. The following characters are common to both of 

 these species: A broad, short areola; a long, slender antennal scale; 

 a single weU-developed lateral spine on the carapace; a long acumen 

 on the rostrum; a telson with three or four spines in the postero- 

 lateral comers of the anterior sections; and similar hooks on the 

 ischiopodites of both the third and fourth pereiopods. Accompany- 

 ing these similarities is the striking resemblance in the first pleopods 

 of the males. 



Despite these close similarities, the males of the two species may 

 be separated by diflerences in the terminal processes of the first 

 pleopods. In the females of Cambarus pubescens the portion of the 

 sternum inmiediatelj'' anterior to the annulus is modified into paired 

 prominences, arising on each side of the midventral line and extend- 

 ing posteriorly and ventrally toward the annulus, whereas the sternum 

 of C. pictus in this region is practically plane. Differences in the 

 chelae of both sexes are also noticeable. 



LITERATURE CITED 

 Faxon, Walter. 



1898. Observations on the Astacidae in the United Sta.tes National Museum 

 and in the Museum of Comparative Zoology, with descriptions of 

 new species. Proc. U. S. Nat. Mus., vol. 20, pp. 643-694, pis. 

 62-70. 



1914. Notes on the crayfishes in the United States National Museum and 

 the Museum of Comparative Zoology with descriptions of new 

 species and subspecies to which is appended a catalogue of the known 

 species and subspecies. Mem. Mus. Comp. Zool., vol. 40, No. 8, 

 pp. 351-427, pie. 1-13. 

 Hahris, J. Arthur. 



1903. An ecological catalogue of the crayfishes belonging to the genus Cam- 

 bams. Kansas Univ. Sci. Bull., vol. 2, No. 3 (whole series vol. 12, 

 No. 3), pp. 51-187, pis. 1-5. 



HOBBS, HORTON H., Jr. 



1938. Two new crawfishes from Florida. Proc. Florida Acad. Sci., vol. 2, 

 pp. 90-91. 



LONKBERG, EiNAR. 



1894a. Cambarids from Florida, a new blind species. Zool. Anz., vol. 17, 



No. 444, pp. 125-127. 

 1894b. Cambarids from Florida. A new blind species, Cambarus acherontis 

 mihi. Bihang Svenska Vet.-Akad. Handl., vol. 20, Afd. 4, No. 1, 

 pp. 3-14, 1 pi. 

 Ortmanx, Arnold Edward. 



1902. The geographical distribution of freshwater decapods and its bearing 

 upon ancient geography. Proc. Amer. Philos. Soc, vol. 41, No. 171, 

 pp. 267-400, figs. 1-8. 

 1905. The mutual affinities of the species of the genus Cambarus, and their 

 dispersal over the United States. Proc. Amer. Philos. Soc, vol. 44, 

 No. ISO, pp. 91-136, pi. 3. 



U. S. GOVERNMENT PRINTING OFFICE: 1940 



