278 ORTMANN — DISTRIBUTION OF DECAPODS [April 3, 



Twenty-six species belong to the fourth group : 



1. mississippiensis Fax. 14. virilis Hag. 



2. immunis Hag. 15. nais Fax. 



3. medius Fax. 16. pilosus Hay. 



4. lancifer Hag. 17. longidigitus Fax. 



5. /«/«»OT Fax. 18. sloanei Bund. 



6. difficilis Fax. 19. rusticus Gir. 



7. alabamensis Fax. 20. ?neeki Fax. 



8. compressus Fax. 21. Ziarrisoni Fax. 



9. propinquns Gir. 22. forceps Fax. 



10. neglectus Fax. 23. spinosus Bund. 



11. digueti Bouv. 24. erichsonianus Fax. 



12. affinis (Say). 25. putnami Fax. 



13. indianensis Hay. 26. ^y/#.y Fax. 



Three species belong to the fifth group : 



1. montezumce Sauss. 3. shufeldti 'Fax. 



2. chapalanus Fax. 



In discussing the distribution, it is best we take up the single 

 groups. The species of the first group are restricted chiefly to the 

 southern parts of the United States and Mexico, and we observe 

 that all, with two exceptions {blandingi axi&pelluadus), are found in 

 the region of North America formed by Mexico, Texas, Louisiana, 

 Mississippi, Alabama, Florida, Georgia and South Carolina. 

 C. blandingi possesses the widest range ; in the States named it is 

 wanting only in the farthest southeast, in Florida and Georgia 1 ; 

 but on the other side it extends beyond those limits along the 

 Atlantic coast, passing through North Carolina, Maryland and New 

 Jersey into the neighborhood of New York, and in the Mississippi- 

 Ohio basin it extends northward through Arkansas, Tennessee, 

 Missouri, Illinois and Indiana into Ohio and southern and eastern 

 Iowa. Westward, it has been found as far as Indian Territory. 

 C. pellucidus is a blind cave species which is restricted to certain 

 localities in Indiana and Kentucky. 



It is apparent that the centre of this group is in the Gulf States 

 and in the southern Atlantic States, while the region of the eastern 

 mountains (Allegheny system) is left unoccupied by it, and only 

 one species advances northward along the Atlantic coast and in the 



1 It is very likely to be discovered in Georgia. 



