8 PROCEEDINGS OF THE NATIONAL. MUSEUM vol. 79 



row secondary lobules; basal portion of the lobe is slender, in the 

 shape of a pedicel. At the sides of this pedicel are placed two pro- 

 jections, with acute proximal ends directed basally. Length of 

 body, 6.5 mm. 



This is a very distinct species. 



Type.— Male, U.S.N.M. No. 43165. 



/Specimens examined. — One male, from Shin Kai Si, Mount Omei, 

 Szechwan; one male and one female, same locality, July 1-17, 1922. 



HYDROPSYCHE PENICILLATA, new species 

 Plate 2, Figukes 19 to 21 



Description. — Head brownish yellow, with yellowish hairs. An- 

 tennae yellow with broad dark annulations; palpi brown. Eyes 

 prominent, black. Thorax yellowish brown; anterior legs brownish, 

 median and posterior ones yellow. Anterior wings brown, with dis- 

 tinct small pale spots, bearing groups of golden-yellow hairs; hind 

 margin truncate. Posterior wings pale, becoming blackish gray 

 apically; median cell open; first apical fork small, sometimes lack- 

 ing. Abdomen dark brown above, brownish beneath, tenth segment 

 (male) yellowish brown, inferior appendages yellowish. Male: 

 Ninth tergite triangularly produced. Tenth segment large, its hind 

 margin with a shallow median excision, at the sides of which arise 

 two slender rod-shaped processes, directed somewhat downward and 

 inward ; the tips of these processes reach the ends of the basal joints 

 of the inferior appendages and bear minute setae. Basal joint of 

 the inferior appendages long, somewhat thickened in its distal por- 

 tion; second joint gradually tapering to its apex. Penis of a very 

 complex structure. Its apical portion appears to be tubular, truncate 

 at its tip, containing, in its interior, two brushes of blackish setae. 

 From the base of this apical portion arise two small lateral 

 processes, bearing at their ends two minute sp':iules, which are 

 directed basally. Before the end, the upper portion of the penis is 

 raised upward in the shape of two nearly oval prominences; a 

 little nearer to the base there are two more small lateral projections. 

 Length of body, 6.5 mm. 



This is a peculiar species, somewhat resembling Hydropsyche col- 

 UTYinata, new species, in the structure of the tenth segment and of the 

 inferior appendages, but it is quite distinct. 



ry^e.— Male, U.S.N.M. No. 43167. 



Specimens examined. — One male (July-August, 1922) and one 

 female (?) (March-April, 1925) from Suifu, Szechwan. 



