264 



BULLETIlSr 54, UNITED STATES NATIONAL MUSEUM. 



Fig. 276.— Livoneca 

 ovALis. Abdomen. 



Body ovate, about one and two-thirds times longer tlian wide, 13 

 mm. : 21 mm. 



Head as wide as long, 3 mm.: 3 mm., narrower anteriorly than pos- 

 teriorly with the frontal margin widel}^ rounded. E3'es small, indis- 

 tinct and situated in the post-lateral angles of the head. 

 Posterior margin of head rounded. The Urst pair of 

 antennae are composed 'of six to seven articles, and 

 extend to the antero-lateral angles of the first thoracic 

 segment, l)ut not to the posterior margin of the head; 

 they are separated in front by a distance equal to 1 

 mm. The second pair of antenna' are composed of 

 eight to nine articles and extend to the posterior margin of the head. 

 The maxillipeds have a palp of two articles. 



The first live segments of the thorax are subequal, each being about 

 2 mm. in length. The sixth and seventh are subequal, each being a 



little shorter than any of 

 the preceding segments, 

 and each about 1^ mm. 

 long. The epimera are 

 distinctly separated on all 

 the segments with the ex- 

 ception of the first; they 

 occupy the entire lateral 

 margin in the second, 

 third, fourth, and fifth 

 segments. In the sixth 

 and seventh segments the 

 posterior extremities are 

 produced beyond the pos- 

 terior margins of the 

 segments, a distance of 1 

 mm. in the seventh seg- 

 ment. 



All six segments of the 

 abdomen are distinct. 

 The abdomen is not im- 

 mersed or set in the tho- 

 rax, and is not a])ruptly 

 narrower than the thorax, 

 the first segment of the 

 abdomen l)eing as wide as the seventh thoracic segment. The seg- 

 ments gradually decrease in width. The sixth or terminal segment is 

 rounded posteriorl3^ Ft is 4^ mm. long and 5 mm. wide at the base. 

 The uropoda do not reach the extremity of the terminal abdominal 



Fig. 277.— Livoneca ovalis. a, Maxillipei>. x 27}. 6, Man- 

 dible. X 27j. c, Second maxilla, x 51|. d, First max- 

 illa. X 27y. e, Seventh leg. 



