704 THAXTER. 



externally convex, but slightly larger than cell VI; cell IV externally 

 convex, slightly broader than long; cell V as long, but narrow; cells 

 II-VI and the small basal cell region yellow and obscurely punctate. 

 Insertion-cell translucent reddish, thick, higher than the base of the 

 venter; basal cell of the outer appendage narrower and about half as 

 long as the subbasal, both hyaline; the latter bearing distally two 

 greatly elongated, stout, nearly uniform, simple branches: an outer 

 pale brown, the lower half of its basal cell narrow and blackened, 

 the inner hyaline or paler, both with a tendency to enlargement at the 

 septa. Basal cell of the inner appendage very small, hyaline, bearing 

 several long slender olivaceous antheridia directly, and a short one- 

 celled branch which also bears one or two. Axis of the perithecium, 

 including the stalk- and basal cell region, diverging at an angle of 

 about 45° from that of the receptacle ; the perithecium yellow, slightly 

 inflated at the base, especially on the inner side, tapering very slightly 

 and then rather distinctly broader at the point where the tip is rather 

 well distinguished, tapering to the characteristically formed apex; 

 the inner lip-cells deeply colored, and ending in a hyaline, blunt api- 

 culus, higher than the outer; which slope obliquely, are distally quite 

 hyaline and distinctly prominent externally, with a similar dark 

 colored obliquely separated suffusion of their lower half, which extends 

 down along the margin of the tip. Perithecia 66-70 X IS jjl. Recep- 

 tacle, to insertion-cell, 88 m. Subbasal cell 50 X 16 m- Appendage 



368 m. Total length 115 /i. 



Growing at the base of the posterior legs of a small fly belonging to 

 the Oscinidae. No. 2181. Laloki River, British New Guinea. 



I have dedicated this very beautiful species to Mr. F. Muir, who 

 very kindly collected for me a small lot of flies in New Guinea, among 

 which two perfect specimens were found. It is not unlike simple 

 forms of L. cristata, except for its punctation, extraordinarily elon- 

 gated appendage, and peculiarly modified apex. 



Laboulbenia Pachylophi nov. sp. 



Straight, or but slightly curved; the perithecium and basal cell of 

 the outer appendage deep translucent olive brown. Structure normal. 

 Basal cell hyaline, enlarged in relation to the foot to form a bulbous 

 base; cell II slightly longer, hardly broader, becoming somewhat 

 suffused with brown, and indistinctly transversely punctate, as are 

 the cells above it: cells III and IV subequal, somewhat obliquely 



