236 BIOLOGICAL SURVEY OF 



distal group on the fourth segment consists of a hair, lateral 

 to it the short claw, and distal to it the long claw. The hair 

 is the longest of the three. The long claw is about one-third 

 longer than the combined length of segments 3 and 4. Lat- 

 erally and posteriorly to the long claw is a still longer hair. 

 The final segment bears a short hair just beyond the middle 

 of the lateral face near the anterior margin. Distally the 

 segment has, anteriorly, a claw twice as long as the segment, 

 and posteriorly, a hair and a sensilla, basally fused. The hair 

 exceeds the claw by half the length of the latter. The sensilla 

 just falls short of the length of the claw, and has a length of 

 65 |j, of which 9^ per cent is the basal portion fused with the 

 adjoining seta. The tip of the sensilla is very slightly ex- 

 panded. 



At this point it is desirable to note that in this genus the 

 claw-shaped setae, both large and small, of the first antenna 

 bear each a fine lateral hairlike branch arising at the begin- 

 ning of the distal third of the claw and extending slightly 

 beyond the main point of the claw. The peculiarity has been 

 found also in L. castanea, but not in Cythere and Cythereis. 



The second antenna is 3-segmented, with ratio of leng-ths 

 (basal segment taken as 10) : 10, 12, 1.4. Aside from differ- 

 ences of proportion and the lack of a distinct division in 

 the second segment, this limb closely resembles that figured 

 by Sars (1925, pi. 79, fig. 1) for LeptocytJiere pellucida. The 

 sensilla of the penultimate segment is 40 |j long and not 

 clavate terminally. 



The mandible and maxilla agree very exactly with Sars' 

 figures for L. pellucida. 



The Scopus of the male is rather attenuated and provided 

 with only about a dozen bristles. 



Limbs 5 to 7 (the walking legs) are, as regards setae and 

 general structure, of the type common to the Cytherinae, and 

 do not display sexual dimorphism. The proportions given 

 below are referred to the second segment of the limb as 10. 

 The claws are measured across the ends, not around the 

 curve, and the claw of the fifth limb is omitted because of 

 its great curvature. 



