56 E. GRASS! AND A. SANDTAS. 



The adult female attains a maximum length of 12 mm.; 

 the adult male is usually a little smaller; neither possesses 

 the slightest trace of wings. 



The adult male is a dull ferruginous-brown, except the 

 head, which is sometimes lighter; the flanks, which are 

 markedly lighter; and the prothorax, which is reddish-yellow. 

 The legs are concolorous with the prothorax, the dorsum of 

 the posterior femora alone being red-brown. The antennae 

 and cerci are ferruginous. 



The adult female is similar in colour to the male, differing 

 only by the lighter ferruginous tint of the dorsal and ventral 

 surfaces, though the former is sometimes as dark as in the 

 male. 



The larva is ferruginous above except for the prothorax, which 

 is more clearly yellow, and sometimes the head, which approxi- 

 mates to the prothorax in colour, and the abdomen, which may 

 be bright castaneous. The ventral surface is always lighter ; 

 the antennae, legs, and cerci are testaceous or ferruginous. 



Both adult and larva are pilose, with sparse and more or less 

 long hairs ; some longer setse are present, especially at the side 

 of the body. The basal joint of the cerci is clothed at the 

 sides with long, fine, vibratile hairs, and at least one such hair 

 is present at the middle of the distal joint on its dorsal side. 



The body is somewhat flattened. The head is nearly hori- 

 zontal, flattened and subhexagonal, with rounded angles, and 

 the Y suture is conspicuous in the larva. The compound eyes 

 are pyriform, scarcely prominent, and situated anteriorly in 

 approximation with the anterior angles of the hexagon ; each 

 consists of more than thirty facets. Ocelli are absent. The 

 antennae are twice the length of the head, filiform, and 

 inserted in front of the eyes. Their joints are rather stout 

 and elongate, cylindrical towards the base, subelliptical to- 

 wards the apex ; the basal joint is markedly broader and often 

 a little longer than any of the others ; the fourth is generally 

 the shortest, the fifth a little longer than the fourth, the 

 second than the fifth, but occasionally it is the shortest of all. 



The remainder are relatively long and diff'er little from each 



