I 



ISOPODS OK NORTH AMERICA. 639 



116. Genus CUBARIS Brandt. 



First pair of antenn;« very siiuill, iiK-onspicuous, composed of three 

 articles. Second pair of antenna' short, generally not longer than 

 one-third the length of the body; iiagelluni composed of two articles. 



Eyes composite, small or moderately large. Clypeus very short, with 

 tiie anterior margin entire, lobate at the sides. Epistome flat, form- 

 ing a continuously straight frontal marginal line. The vertical mar- 

 ginal line reaches the frontal line. 



First thoracic segment with the epimera posteriorly cleft, often 

 also the second; rarely entire. Terminal abdominal segment tetrag- 

 onal, wider at the ])ase than at the apex, more or less contracted in 

 the middle. 



Outer l)ranch of all the pleopoda furnished with trachea'. Uropoda 

 short, not extending be^'ond the terminal al)dominal segment. Basal 

 article or peduncle large, wide, entire, tetragonal, obliquely produced; 

 outer branch very small, rather slender, inserted at the middle of the 

 inner lateral margin of the basal article; inner branch small, rather 

 slender or rather compressed." 



ANALYTICAL KEY '^ TO THE SPECIES OF THE GENUS CCBARIS. 



II. Body tuberciilate. 



b. Second thoracic segment without a distinctt coxopodite. 

 c. Coxopodite of the first thoracic segment hardly perceptible as a very small 

 process below the leg. Prosepistoma of head with a shield-like convexity. 

 Apex of telson half as wide as basis. Endopodite of the uropoda extends 



one-half the length of the telson Cubarls tenuipimctatit (DoUfus) 



(/. Coxopodite of the first thoracic segment hardly perceptible, only a feeble 

 ridge. Prosepistoma of head nearly flat. Apex of telson one-third nar- 

 rower than basis. Endopodite of the uropoda extends two-thirds the 



length of the telson Cuharis depream ( Dolifus) 



¥. Second thoracic segment with a distinct coxopodite (underside). 

 c. Coxopodite of the first thoracic segment distant from the edge, crested, and 



ended by a tooth-like diverging process C'libaris niticola (Dolifus) 



c^. Coxopodite of the first thoracic segment not distant from the edge and not 

 crested. 

 d. Coxopodite of the first thoracic segment distinct along the entire length of 

 the edge (underside). 

 e. Coxopodite of the first segment divergent on the iiah' liind jjart. Cox- 

 opodite of the second segment forming a tooth-like diverging process. 



Cubaris gilrarum (Dolifus) 

 e\ Coxopodite of the first segment not divergent. Coxopodite of the second 



segment large, square-shaped Cubaris perlata (Dolifus) 



d^. Coxopodite of the first thoracic segment not distinct along the entire length 

 of the edge. 

 e. Coxopodite of the first segment small, dentiform, and very unequally 

 cleft Cubaris murina Brandt 



«See Budde-Lund for characters of genus. Crust. Isop. Terrestria, 1885, pp. 15-16. 

 '' Cnbaris califor)iica (Stuxberg) is not included in this key, as the description is not 

 sutlicient in detail to obtain characters for synoptical arrangement. 



