618 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



nent corners. Lateral lobes broad and curved inward at the tips. 

 Thoracic area in the shape of a spherical triangle about half the entire 

 length of the carapace, with a blunt rounded point at the median line 

 anteriorly. Eyes small with prominent lenses, situated about one- 

 third the distance from the anterior margin. 



Free segment short and relatively wide, covered by a pair of broad 

 wings which extend outward to a level with the lateral margins of 

 the genital segment and backward for some distance over the base 

 of the latter. Their anterior margins are straight and inclined 

 slightly backward, while the posterior margins are strongly curved 

 and do not meet at the midline, leaving a space between them two- 

 thirds of their own diameter. These wings are thus very similar to 

 those on Alehion and Gloiopotes, except that in the latter the two are 

 fused on the midline. 



Genital segment acorn-shaped, considerably narrowed anteriorly 

 where it, joins the free segment, with short, wide, and well-rounded 

 lobes at the posterior corners. On the ventral surface of these lobes 

 are the rudimentary fifth legs, whose tips project a little beyond the 

 posterior'margins of the lobes, so as to be visible in dorsal view. 



Abdomen at its base one-fourth the width of the genital segment; 

 tapering toward the tip; one-jointed. Anal laminae long, narrow, 

 and well-rounded at the ends, each carrying three long terminal 

 setae and two small spines on the outer margin. Egg tubes wider 

 than the base of the abdomen, three-fourths as long as the body, each 

 containing about 50 eggs. 



Of the appendages the first antenna? are two-jointed, the basal 

 joint longer than the terminal, and both joints heavily armed with 

 setae and spines. The lunules are huge, semicircular, projecting well 

 in front of the bases of the antenna, and reaching back nearly to the 

 groove between the frontal plates and the carapace. The second 

 antennae are rather small and weak, with a slender but strongly 

 curved terminal claw. This claw carries on its inner margin near the 

 base two accessory spines close together and borne on small basal 

 papillae. 



The basal joint carries a broad laminate spine on its posterior 

 outer corner. The first maxillae are comparatively large and pushed 

 forward until their base is actually in front of that of the second 

 antennae. The whole maxilla is wide and stout and is curved strongly, 

 especially near the tip. It is as large as the terminal claw of the 

 second antennje and bears on its ventral surface near the center two 

 small knobs or papilla?, one on either side. 



The second maxillae are also much larger than in Caligus and 

 Le/peoylitheirus. They are simple like those of the former, broad, 

 stout, and curved away from each other, with blunt ends and a small 

 flange on the convex margin. Each is jointed to the ventral surface 



