514- GENUS BrA3T\XIS. [My, 



Biediate oncs^ basal joint robust, witbout a scale, ter- 

 lEinal joint aiticulated; external pediyalpi very large, 

 pediform, nearly attaining the front, first joint very 

 Mucb elongated, compressed, remaining joints very 

 fimall, cylindrical^ subeqiiai;/ee;f five pairs, bifid, an- 

 terior pair tTimcate at tip, shorter tlian the external pe- 

 dipalpi^ second pair acuminate, third, fourth, and fifth 

 irnirs reilectcd, acuminate, destitute of nails, armed to- 

 wards the tip with robust hairs; abdomen five-jointed, 

 cylindric, much narrower than the thorax, four ante- 

 rior joints subequal, fifth rather longer, fir&t and second 

 fic^cnts furnished beneath witli natatory feet ; tail bi- 

 {2rtieulate, first joint with a lateral style, composed of a 

 cy liiidrical peduncle and bifid, short seta, second joint 

 sHialler tiian the preceding, terminated by a simple cy- 

 lindrical style, 



Sjpecies. 



B- ^arenaridS, Thorax above a little undulated, 

 glabrous, as long as the abdomen and tail conjunctly, 

 edge each side before minutely crenate; rostrum short, 

 «iMu&e, triangular; intermediate antennai two thirds the 

 length of the first joint of the tiiorax, inferior seta less 

 ton half as long as the superior one, exterior antennce 

 longer than the first joint of the tliorax, basal joint at- 

 tuning tlie tip of the third joint of the inner antenna*. ; 

 iaterul caudal styles divaricated, longer than the tail, 

 jieduHcles somewhat dilated at tip, setae half as long as 

 ^e peduncle, and appearing articulated, terminal styk 

 tes thaa lialf the length of the lateral ones. 



length one fifth of an inch. 



