64 DUKHAM DIPTEEA 



X. 95. 



2 (3). Wings with only the X-veins clouded. 



(662. metadata, Mg.) 



3 (2). Wings with the X-veins clouded, and also other spots. 



(663. nehdosa, Mg.) 



4 (1). Wings unspotted. 



5 (6). Testaceous, thorax with four reddish-brown stripes, of 



which the side ones are short. 



664. Dixa (Bstivalis, Mg. 

 Gibside, 1 $, April, 1898. 



6 (5). Black, thorax testaceous along each side, and with two 



pale centre streaks. (665. aprilina, Mg.) 



Family XL— PTYCHOPTERID^E. 

 96. Ptychoptera, Mg. 

 The larvae live in shallow muddy pools. 



1 (8). Wings spotted. 



2 (7). Hind metatarsi not white. 



3 (4). Pleurae shining silvery white. 



666. Ptychoptera contaminata, L. 

 Hesleden, 1 $, 4-8-99; Waskerley, 1 <?, 20-4-01. 



4 (3). Pleurae shining black without any silver sheen. 



5 (6). Abdomen all black. (667. pahidosa, Mg.) 



6 (5). Abdomen with two yellow bands. 



668. Ptychoptera lacustris, Mg. 

 Bedburn, 1 ?, 7-7-02. 



7 (2). Hind metatarsi white. 



669. Ptychoptera albimana, F. 

 South Durham, 3 ? ; Bishop Middleham, 1 $, 1 ?, 

 June, 1903. 



8 (1). Wings unspotted. 



670. Ptychoptera saitellaris, Mg. 

 Bishop Auckland, 1 $ , 25-6-02; Bishop Middleham, 

 2 $, 1 ?, June, 1903. 



