224 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



First pair of antennae longer than the second pair; first and 

 second joints equal in length ; third joint twice as long as second ; 

 fourth joint about two-thirds as long as preceding. Second 

 antennre reaching only to middle of fourth joint of first pair; 

 shorter than head; fourth joint one and a half times as long as 

 third which is subequal in length to each of the first two joints ; 

 fifth joint a little longer than the fourth; flagellum minute, com- 

 posed of a single joint which is about one-third as long as the 

 fifth joint. 



Fig. 70. Edotca triloba. 



Third and fourth joints of thorax longer than any of the 

 others and also the widest. Coxal plates of none of the segments 

 distinctly separated; their lateral margins, especially in front, 

 almost straight. Dorsal side of body characterized by two longi- 

 tudinal depressions which divide it into a middle lobe and two 

 lateral ones which bear each a rounded tubercle. Legs prehensile 

 and slender with dactyls which are almost acicular; first pair by 

 far the shortest. 



Abdomen composed of a single segment with slight incisions 

 near the base indicating another segment partly coalesced ; telson 

 with a large rounded prominence situated in the median line at 



