STALK-EYED CRUSTACEA 59 



Subfamily I. Pericerinae. 

 Subfamily II. Othoninae. 

 Subfamily III. Mithracinae. 



Synopsis of the Subfamilies. 



A. First pair of legs with tlie fingers acute at the tips. 

 Rostrum well developed. 



a. Carapace more or less subtriangular. Second joint 

 of external antennae not dilated. — {Pen'cen'ncu.) 



B. First pair of legs with the fingers excavated at the 

 tips. Rostrum short or wanting. 



b. Carapace suboblong ; interorbital space broad 

 Second joint of external antennae enlarged. — {OthoiiincE.) 



c. Carapace broadly triangular, sometimes transverse ; 

 interorbital space narrow. Second joint of external 

 antennas not dilated. — {Mit/iraciiue.) 



Subfamily I. Pericerinae. 



Pericerince . . . Miers, Stimpson. 



Carapace more or less subtriangular. Rostrum well 

 developed. Second joint of external antenna; not dilated. 

 First pair of legs with the fingers acute at the tips. 



Synopsis of the Genera. 



A. Rostrum emarginate at apex. 

 a. Basal joint of external antenncii \i 



moderately enlarged. P h^ 



a}. Praiocular spine distinct. — {Lidiuia.) ^ ' . 



B. Rostrum composed of two distinct LH)i)iia. 

 spines. 



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