b EINAR LÖNNBERG, CAMBARIDS FROM FLORIDA. 



form. But C. pellucidns has a smootli carapax except for 

 these spiiies or only »lateribus subgranulosis» (Hagen [2]). In 

 this respect the Florida -form is quite different, as tlie sides of 

 the head and the branfhial region are both densely oovered 

 with large grannles or small tnbercles only leaving the areola 

 and rostrnm smooth. The distal segment of telson has quite 

 a different form too, as it is in the Florida-form mueh shorter 

 and l)roader, nearly twice as broad as long, and not so rounded, 

 but more square. I need not say more; it can not be disputed 

 that the Cambarus from Lake Brantley is a well distinguished 

 species, and 1 consequently propose the name Camharns aclie- 

 ronfis. A diagnose of this new species then will be as follows. 



Camharns acheronfis Lönnberg (belonging to the firstgroup 

 according to Faxon: type C. Blandingii). 



Male form 1: Rostrum broad. smooth, very excavated 

 above, margin raised into sharp crests, gradually converging 

 towards the tip, but they do not come together there to form the 

 point. but end in the angles whieh correspond with the lateral 

 teeth of other species. In this way the rostral groove remains 

 open in the distal end. At the end of rostrum there is a short 

 and blunt tooth. the base of which extends into the foremost 

 part of the rostral groove as a slight ridge. Any real »lateral 

 teeth do not exist, but are only represented as the ends of 

 the marginal crests, which form ol)tuse angles. Postorbital 

 ridges not strongly developed, with a small anterior spine. 

 Carapax broader than abdomen. smooth above on the areola 

 and on the top of the head, on the sides of the liead and on 

 the branchial region strongly granulated or covered with small 

 tubercles, but no spines at all. A row of the granules behind 

 the cervical groove is a little but only very little larger 

 than the other ones, the same is the case with some of them 

 on the sides of the head. The distance from the hind margin 

 of the carapax to the cervical groove is a little more than or 

 just about two thirds of that from the cervical groove to the 

 tip of the rostrnm. Areola narrow. Abdomen smooth, narrower 

 than carapax and short (much shorter comparatively than in 

 C. pellucidus), the distance from distal end of telson to hind- 

 margin of carapax of the same length as from the hindmargin 

 of carapax and to the tip of rostrum. The lateral ontlines 

 of the abdominal segments nearly elliptical with an angulation 

 at the end. Only one short and blunt spine on each side of 



