fi58 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvm. 



For these reasons we have considered it necessary to change Nor- 

 nian's hihel, which has never been publisiicd, and k^ave Z. gracilis in 

 its old phice as a s^^ionym of L. thompsoni. 



Under the latter species will be found (see p. (522) a full discussion 

 of these troublesome synonyms. It will suffice here to state that the 

 present species can l)e distinguished at once from L. tliomp.soiii, with 

 which it is most likely to })e confused, by the equalit}' in size between 

 the carapace and genital segment, l)y the comparative length of the 

 abdomen (considerably longer than either carapace or genital seg- 

 ment), and by the large size of the second maxillipeds. In the present 

 species, also, the basal joint of the fourth leg reaches well beyond the 

 margins of T)oth carapace and genital segment, while in t/iowjji^ofii the 

 entire leg, if straightened out, would not reach the margin of the cara- 

 pace, and the basal joint falls far short of reaching the margin of the 

 genital segment. Finally, the present species was found on a very 

 diti'erent host. 



LEPEOPHTHEIRUS CHILENSIS, new species. 

 Plate XXVIII, figs. 353-364. 



Female. — Carapace orV)icular, as wide as long, the frontal margin 

 strongly curved and deeply incised at the center. 



Posterior sinuses shallow and widely triangular; median lobe about 

 one-half the width of the carapace, and not projecting umch behind 

 the lateral lobes. Transverse groove separating the cephalic from the 

 thoracic areas almost exactl}^ in the center of the carapace; lateral 

 grooves nearly straight. 



Free thoracic segment short and less than half the width of the 

 genital segment; very prominently widened at the center through the 

 base of the fourth leg. Genital segment half the width of the cara- 

 pace, one-fourth wider than long, with strongly curved lateral mar- 

 gins and somewhat reentrant posterior margin. 



Abdomen half as long as the genital segment and one-fifth as wide, 

 distinctly two-jointed, the joints a)>out equal. 



Anal lamina? small and widely separated, curved in slightly toward 

 each other and armed with small and short seta?. 



The anterior antenni^ are large, three-fourths as long as the frontal 

 plates with the terminal joint shorter and much narrower than the 

 basal. Both joints are heavily armed with sette, those on the terminal 

 joint being gathered at the tip. 



The posterior antenna? are large, the basal joint swollen and with a 

 good-sized spine on its ventral surface. The terminal claw of these 

 appendages is strongly bent in a horizontal direction at the base, and 

 again in the usual vertical direction at the tip. The first maxiliw are 

 close to the tip of these antenna?, are of medium size, and nearly 

 straight. 



