656 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvm. 



LEPEOPHTHEIRUS INNOMINATUS, new species. 

 Plate XXVIII, figs. 345-352. 



Female. — Carapace elliptical, one-eighth longer than wide, equally 

 narrowed anteriorly and posteriorly. Frontal plates small, but well 

 defined with a deep incision at the center. 



Posterior sinuses shallow, narrow, somewhat enlarged at the base 

 and inclined diagonally outward. Of the grooves separating the car- 

 apace areas that which represents the crossbar of the "H" is only 

 two-sevenths of the length of the carapace from its posterior margin. 

 Furthermore it is not curved, but is made up of two straight lines 

 meeting at the center like the sides of a very flat roof. This leaves a 

 thoracic area proportionally smaller than in any known species of 

 either Caligus or Lepeophtheirus. The longitudinal grooves are 

 strongly curved, so as to be practically parallel with the margin of the 

 carapace. The eyes are situated well forward and are of good size. 

 The median lobe of the carapace projects backward well beyond the 

 lateral lobes; it is abruptly narrowed at about the center as if jointed, 

 the posterior half being semi-circular and overlapping the free segment 

 a little. 



The latter is considerably more than half as wide as the genital 

 segment; is quite short and somewhat crescentic in shape. 



The genital segment is fully as large as the carapace, quadrangular 

 in outline, with well rounded corners and a squarely truncated posterior 

 margin. Anteriorly it narrows into a short neck, where it joins the 

 free segment, the neck being considerabty narrower than the free 

 segment. 



The abdomen is narrow cylindrical, about one-third the width of the 

 genital segment, and nearly four times as long as wide. It is two- 

 jointed, the basal joint three times the length of the terminal; the latter 

 joint is also quite a little narrower than the former, but does not taper 

 posteriorly. The anal laminae are of good size and curve in toward 

 each other at their tips; the plumose seta? are rather short and slender. 



The egg strings are two-thirds as wide as the abdomen and five- 

 eighths the length of the body ; the eggs are small, eighty or eighty-five 

 of them in each string. 



Of the appendages, the first antennas are about as long as the frontal 

 plates, the two joints of the same length, and well supplied with seta? 

 and spines. The second antenna? are long and slender, the most of 

 the length being in the terminal claw, which is strongly bent near the 

 tip. The basal joint is short and stout. The two pairs of maxilla? are 

 .small and slender, the second pair bifid for only a third of their 

 length, with the branches parallel and close together. 



The f urea is small, the base and branches about the same length, 



