European Trichoptera. 295 



Halesus (Drusiis) rectus^ n. sp. (PI. XIV. fig. 5). 



Fuscous. AntenncB fuscous, narrowly annulate with 

 yellow on the basal third. Head narrowly transverse, the 

 eyes very prominent; blackish, occiput with two 

 tubercles posteriorly, whence spring long yellow hairs, 

 and two anteriorly, placed quite between the basal joints 

 of the antenno3 ; front thickly clothed with yellow hairs : 

 maxillary palpi testaceous. Prothorax densely clothed 

 with long yellow hairs : meso- and meta-tJiorax fuscous, 

 hairless. Anterior ivings rather short and broad, the 

 apex somewhat dilated ; grayish yellow, thickly clothed 

 with short yellow pubescence, neuration fuscous; dis- 

 coidal cell short, not longer than its footstalk ; first 

 apical cellule rather longer than the third, oblique at the 

 base ; second shorter, trvmcate ; third longer than the 

 second, sub-acute ; fourth as long as the second, and 

 oblique ; fifth longer than the third, very oblique, almost 

 acute at the base ; a whitish dot at the thyridium and at 

 the arculus; posterior wings pale grayish, sub-hyaline; 

 pouch of the ^ short, the hairs yellow, fringes gray. 

 Legs yellowish, the terminal joints of the tarsi, and the 

 coxae, fuscescent, the latter with two rows of yellow hairs. 

 Abdomen with the basal segments testaceous, the api- 

 cal fuscous, each with a broad ochreous posterior 

 margin. 



Anal appendices of the ^ : the surface of the last 

 dorsal segment is deep black, the median portion 

 scabrous, truncate at the apex, the sides elevated into 

 a ridge leaving a broad depressed space between ; on each 

 side of this space, near the middle, is a long golden hair ; 

 the lateral edge below the ridge shows an ochreous exci- 

 sion : app. sup. very small, the apex fuscescent ; app. 

 intermed. short, intensely black at the tips, which appear 

 as two rounded tubercles springing from a transverse 

 semicircular plate at the base, which plate forms the 

 upper cover of a deep cavity within (seen en face) ; app. 

 inf. long, widely divergent, subcylindrical, obtuse, 

 slightly curved upwards : penis scarcely visible {$). 



Expanse of fore- wings 9|"'. 



Pyrenees {Uev. T. A. Marshall), 1 $ . 



