276 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



Fig. 924. — Ochrotrichiafelipe, male genitalia. 

 A, lateral aspect; 5, tenth tergite; C, ventral 

 aspect. 



Fig. 925. — Ochrotrichia tenanga, 

 male tenth tergite. The small 

 capital letters in this figure and 

 that above have been used to 

 facilitate comparison with similar 

 parts in figs. 468-470. 



ent arrangement of the sclerotized processes 

 making up the dorsal complex of the tenth 

 tergite. 



Male. — Similar in size, color and general 

 structure to the male of capitana. Genitalia 

 as in fig. 924. Ninth segment annular, with 

 the dorsal portion incised on the meson to 

 accommodate the tenth tergite. Tenth ter- 

 gite composed of a large number of sclero- 

 tized blades and processes making up the 

 dorsal complex. These are arranged in 

 three main groups, a right group, a left 

 group and a dorsal, long, sinuate blade 

 which arises between them. Claspers almost 

 symmetrical, the lateral aspect boot shaped, 

 the mesal face with a sinuate row of short, 



stout, rounded spines. From ventral view, 

 these appear in silhouette on the narrower 

 apical portion and continue under the mesal 

 angle where the clasper narrows abruptly. 

 Aedeagus simple, tubular and filamentous, 

 as in other species of the genus. 



Holotype, male. — San Felipe Springs, 

 Del Rio, Texas: April 19, 1939, H. H. & 

 J. A. Ross. 



Paratypes. — Same data as for holotype, 

 2$. 



Hydroptila waskesia new species 



This species is closely related to both 

 delineata and vala, differing from both of 

 them in the very long lateral projections of 

 the ninth sternite and in having the spur 

 on the membranous appendages arising be- 

 low the tenth tergite. 



Male. — Length 3.7 mm. Color various 

 shades of dark gray and cream, the two 

 mixing to form a salt-and-pepper pattern 

 typical for the group. General structure 

 typical for genus. 



Genitalia as in fig. 926. Ninth segment 

 produced into a long, triangular pair of 

 internal projections, the posterior margin 

 of the sides produced into a long, bladelike, 

 tapering and sharply pointed projection 

 which curves slightly mesad and turns slight- 

 ly dorsad at apex. Tenth tergite long, com- 

 posed of a pair of lateral sclerotized areas 



Fig. 926. — Hydroptila was.kesia, male geni- 

 talia. J, lateral aspect; B, dorsal aspect; C, 

 claspers. 



