483 



which extends to the sides of the posterior margin. Median black, 

 posterior spot of mesonotum with concave anterior margin, without dark 

 dots anteriorly and laterally; small spot of metanotum with irregular 

 anterior margin, with a deep indentation posteriorly. Medioanal surface 

 seta of mesonotum longer than that of pronotum, brownish, with blunt apex; 

 medioanal seta of metanotum short. 



FIGURES 680-682. Hydropsyche ornatula McL.: 



680 - labrum; 681 - mandibles, dorsal: left mandible (A), right man- 

 dible (B); 682 - mesonotum (A), metanotum (B). 



Propleuron (Figure 683) whitish yellow at the base, irregularly quadran- 

 gular; pleural suture diagonal, blackish brown; episternum larger than 

 epimeron, with indistinct, light, large dots; epimeron with a group of short 

 setae in the basal part; 3 setae thicker than the others, and 2 small distal 

 setae; trochantin with a hornlike process at the base so that it appears 

 forked; process without setae; other part of sclerite with several short 

 setae, 2 of them thicker than the others; 2 setules situated distally. 



551 



