ART. 25 INSECTS OF ORDER TRICHOPTERA MARTYNOV 3 



Male: Ninth dorsal segment very broad, forming above a broad, 

 subtriangular projection; ventral portion very narrow, covered by 

 the eighth segment; seventh sternite forming a transverse arcuate 

 platelike projection; the base of the sixth sternite provided with a 

 large platelike appendage, almost square, if seen in front, but its 

 hind margin appears as if broken. 



The tenth segment is divided into two lateral portions, each of 

 which is also divided by a deep oval excision into two lobes or 

 processes. Upper, or inner, processes are long, slender, and acute 

 at their ends, curved downward (if viewed laterally). Lateral 

 lobes are much shorter, triangular from side, rounded at their ends 

 above, bearing numerous long hairs. These lateral lobes are united 

 at their bases with large basal pieces, forming internally two other 

 lobes, similar to these, but shorter, pale, and bearing several stiff 

 blackish curved hairs. 



Unpaired median process of the ninth tergite long and broad, its 

 left margin straight, the right one convex, arcuate; apical portion 

 narrow, almost claw-shaped, with apex directed to the right side. 

 Penis not exserted in our specimens. In the female the wing vena- 

 tion is similar to that in the male, except the anal region. There 

 is but a small tooth on the sixth sternite. Length of body, 5.5 to 

 6.5 mm. : expanse, 16 mm. 



In the structure of male genital segments this species resembles 

 Glossosonia. valvatwin Ulmer, but differs obviously by the configura- 

 tion of anal region in the anterior wings, as well as by the structure 

 of the tenth segment. 



ry;?^.— Male, U.S.N.M. No. 43163. 



Specimens examined. — Two males and two females, including the 

 type, from Shin Kai Si, Mount Omei, SzechAvan, July 1-27, 1922; 

 one male, from Shin Kai Si, Szechwan (4,400 feet), July, 1922. 



GLOSSOSOMA CAUDATUM, new species 



Plate 1, Figures 8 to 11 



Desc?iption. — Head and thorax blackish brown above, with yellow- 

 ish hairs. Antennae yellow, with brown annulations, which are 

 broader than in G. anale; distal portion of antennae brownish, basal 

 joint testaceous. Thorax brownish yellow laterally; legs dark yellow. 

 Abdomen brownish above, yellow beneath ; ninth and tenth segments 

 yellow. Anterior wings brownish or fumose; their venation is simi- 

 lar to that of G. amile, differing chiefly in the configuration of the 

 anal region. Ai sinuate; A2 directed rather downAvard, to the base 

 of the "anal callosity"; this structure is very distinct, transverse, 

 pale yellow, raised upward. 



Male: Ninth dorsal segment not so broad as in G. anale, its pos- 

 terior margin being only feebly convex, if seen dorsally. Transverse 



