1926 ] 
Undescribed Species of Dicranoptycha 
55 
the various forms. At the base of the mesal face of the basistyle 
but not connected with it, nor, apparently, connected with the 
tergite, lies a pale flattened rod that is termed herein the lateral 
process. From its position it appears to be an interbasal process 
but from its location in membrane rather removed from the 
basistyles, I hesitate to call the structure an interbase. The 
shape of these lateral processes differs much in the various spe- 
cies. The aedeagus and surrounding apophyses vary greatly 
and offer remarkable characters. The largest aedeagi are found 
in D. sobrina O. S. and D. megaphallus, sp. n. In most of the 
other species, the organ is relatively small and insignificant. 
The gonapophyses are greatly produced and bifid at their tips in 
D. tigrina Alex. 
Dicranoptycha australis sp. n. 
Male. — Length 9-9 . 5 mm. ; wing 8 . 5 mm. 
Female. — Length about 8-8 . 5 mm. ; wing 8-8 . 3 mm. 
Generally similar to D. sobrina O. S., differing especially 
in the hypopygial characters. 
Basal two segments of antennae obscure yellow, the flagellum 
abruptly dark brown. Head and thorax light gray, the praescutum 
with a very ill-defined grayish brown median stripe. 
Pleura light gray. Legs with the coxae sparsely pruinose; tro- 
chanters obscure yellow; femora and tibiae obscure yellow, with 
darker setae; terminal tarsal segments passing into dark brown. 
Wings with the costal fringe (cf) relatively short and incons- 
picuous; membrane strongly suffused with brownish yellow, the 
costal region clearer yellow; veins brown. Venation: Rs shorter 
than the elongate cell ls£ M 2 , sometimes angulated and spurred 
at origin. 
Abdominal tergites pale to medium brown; segment seven 
blackened; eight dark brown; hypopygium and sternites pale. 
Male hypopygium with the outer dististyle relatively small, 
gradually narrowed and gently curved to the long acute apical 
spine; outer surface with short, dense, erect setae; distal half 
with microscopic appressed serrulations. Inner dististyle stout, 
the apex suddenly enlarged, provided with coarse setae. Aedeagus 
