78 XEW SPECIES OP AUSTRALIAN CADDIS-FLIES, 



Key to the Species. 



1. Smaller species, expanding about one inch; third apical fork of fore- 



wing short, stalked 2. 



Larger species, expanding well over one inch; third apical fork of fore- 

 wing either sessile on me, or with Mi and M2 arising together 

 from it 3. 



2. In the male, the gonapophyses are much shorter than the preanal ap- 



pendages, and have a strongly projecting interior tooth at one-third 



from apex St. mjb'bergi Ulmer 



In the male, the gonapophyses and preanal appendages are of equal 

 length, and the former have no projecting internal tooth. 



St. montana n. sp. 



3. Body black, forewings heavily marked with rich black and gold. 



St. melcmochrysa n. sp. 

 Body yellowish brown, forewings fawn-coloured, with a delicate reticu- 

 lation of pale fuscous St. hiemalis n. sp. 



STENOPSYCHODES MONTANA n. sp. 



(Plate XXIVA., fig. 1; Text-fig. 2). 



c*. Total length 10.2, forewing 11, hindwing 9.5, expanse 24 mm. 



Head black, with sparse golden hairs, a conspicuous patch of bright golden 

 hairs between antennae. Occiput much swollen behind. Antennae (broken off) 

 with basal segment black, somewhat swollen. Eyes greyish black. Palpi dull 

 blackish. 



Thorax black with sparse golden hairs on nota. Legs dull blackish. 



Abdomen slender cylindrical, black. Appendages rich brown, except 

 basal two-thirds of gonapophyses, which are blackish. The ninth tergite is very 

 short, the tenth narrow, produced to about two-fifths the length of the shorter 

 pair of apoterga, and having a broadly truncated apex. Of the two pairs of 

 apoterga, the shorter arise the closer together, converging until they almost meet 

 close to their apices, then turning and diverging sharply; they are slender, sharply 

 pointed, and somewhat less than half as long as the gonapophyses. The second 

 pair of apoterga are excessively long and slender, about one-fourth as long again 

 as the gonapophyses, converging from their bases to near half-way, when they 

 run very close together and finally curve sharply upwards to their sharp apices 

 beyond the gonapophyses. Preanal appendages of same length as gonapophyses, 

 fairly slender and only slightly curved; their apical fourth slightly hairy, apex 

 not sharply pointed. Penis broad, subcylindrical, somewhat shorter than gona- 

 pophyses, its apex notched, curving slightly downwards, and carrying a pair of 

 titillatory bristles. Gonapophyses broad and strongly built, the basal half curv- 

 ing upwards, the apical half slightly inwards; the tips well rounded, slightly 

 hairy. Closely appressed against and somewhat above the basal half of each is 

 a broad, subtriangular process from the ninth steruite, carrying a series of short 

 stiff hairs along the margin which borders the gonapophysis. These appendages 

 are shown in dorsal view in Text-fig. 2, a, in lateral view in Text-fig. 2, b. 



Wings: Forewings with all the veins outlined in black on a rich fulvous 

 ground colour; distal border from beyond pterostigma around apex to tornus 

 continuously margined with black, most deeply at apex itself. Numerous cross- 

 bars of black connect all the veins, except in the basal half of the costal space, 



