CYMOTHOIDEA. 



763 



the abdomen, inner angle of base obtuse, branches nearly equal, 

 external, slightly the shorter, obliquely truncate. 



Plate 50, ftg. 11a, dorsal view; b, ventral; c, side view, showing 

 epimerals; d, antennae; e, claw of legs; /, caudal appendage. 



From Eio Janeiro — rare. 



Length, three-fourths of an inch. Colour, brownish yellow, with 

 three broad brown longitudinal lines. The thorax widens slowly 

 from the head and attains its greatest width at the penult joint; the 

 articulations are convex backward to that between the last and pre- 

 ceding segment, which is nearly straight or slightly convex forward. 

 Epimeral of second segment scarcely longer than segment, obtusish; of 

 third and fourth longer than segment; of fifth subacute, and reaching 

 as far back as lateral margins of segment; of sixth and seventh very 

 acute, and much shorter than lateral margin of the segments ; of the 

 seventh attached to seventh segment beneath lateral margin of sixth 

 segment. The linear processes each side of first two abdominal seg- 

 ments about as long as half the width of the segment. Third pair of 

 legs and claw much smaller than first or second; seventh pair more 

 slender than the preceding, and distant from it ; the basal joint about 

 as long as following portion ; claw about half as large as that of sixth 

 pair. Claws of legs very long, and gibbous within near base. 



Anterior pair of antennae seven-jointed ; posterior ten-jointed ; first 

 joint of anterior pair short, second largest and longest ; of posterior 

 pair, fifth longer than either of the terminal ,/we. 



This species resembles the aeuleata in the oblique truncation of the 

 inner branch of the caudal appendages ; but the inner angle of the 

 basal portion is obtuse, the general form is different, the body narrower 

 and the antepenult thoracic joint is not acute, and is quite closely ap- 

 pressed to the following on either side. 



Subfamily ^EGATHOINJE. 



Genus JEGATHOA, Dana. 



Corpus angustum, elongate ellipticum, ad abdominis basin non inter- 

 ruptum (abdomine non angusthre), segmentis thoracis submquis, abdo- 



