552 



PROCEEDINGS OF THE XATIOXAL MUSEUM. 



VOL. XXIII. 



124. ASELLUS ATTENUATUS Richardson. 



Asellus ottP'miatuK RicnARDsox, Am. Nat., XXXIY, 1900, p. 297. 



Body narrowed anteriorly, g'radually increasing in width backward. 



Head narrower than the tirst thoracic segment, rounded at the sides 

 with margins entire and a small lobe near the base on either side; 

 front somewhat excavate for the reception of the antennae. Eyes dis- 

 tinct, lateral. First pair of antenna? as long as the peduncle of the 



Fig. 26. — .'\sF.i,Lrs attenuatits. 



second pair; first joint short and broad; second joint more slender; 

 third joint not quite as long as second joint; flagellum composed of 

 thirteen joints. Second pair of antennfe as long as the body; tirst, 

 second, and third joints short, about equal in length; fourth and hfth 

 joints long; flagellum multiarticulate. 



Segments of thorax with the lateral margins of the first segment 

 slightly emarginate anteriorly, the emargination being tilled by the 

 epimeron; second, third, and fourth segments with the margins entire, 

 the epimera evident at the (^xtreme anterior angles; the fifth segment 

 with the posterior two-thirds emarginate, the epimeron conspicuous in 



