264 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



FIG. 276. LlVONECA 



OVALIS. ABDOMEN. 



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

 mm. : 21 mm. 



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

 teriorly with the frontal margin widely rounded. Eyes small, indis- 

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

 Posterior margin of head rounded. The first pair of 

 antennae are composed of six to seven articles, and 

 extend to the antero-lateral angles of the first thoracic 

 segment, but not to the posterior margin of the head; 

 they are separated in front by a distance equal to 1 

 mm. The second pair of antennae 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 five 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 abruptly 

 narrower than the thorax, 

 the first segment of the 

 abdomen being as wide as the seventh thoracic segment. The seg- 

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

 rounded posteriorly. It is 4$ mm. long and 5 mm. wide at the base. 

 The uropoda do not reach the extremity of the terminal abdominal 



PIG. 277. LIVONECA OVALIS. a, MAXILLIPED. x 27}. b, MAN- 

 DIBLE, x 27}. c, SECOND MAXILLA, x 51|. d, FIRST MAX- 

 ILLA, x 27}. e, SEVENTH LEG. 



