76 NEW SPECIES OF AUSTRALIAN CADDIS-FLIES, 



(a) The tenth tergite, standing dorsally above the anus, is frequently of 

 peculiar shape and sculpture, and may send out either one or two long slender 

 processes, called by Ulmer fisliboiue-like processes, but which I propose to term 

 apoterga. (Text-figs. 2, 3, at). 



(b) On either side of these, latero-dorsally, there project from the ninth 

 tergite the preanal appendages, also very variable in shape, sometimes long and 

 slender. (Text-figs. 2, 3, pa). 



(c) Situated between the tenth sternite above and the ninth sternite below. 

 is a single unpaired median organ, the penis, at the tip of which opens the 

 ejaculatory duct. This organ is usually directed obliquely downwards. (Text- 

 figs. 2, 3, pe). 



(d) Developed ventrally from the ninth sternite, there is a pair of gotm- 

 pophyses (called by Ulmer genital-faet), which may be either two-segmented or 

 simple; they are generally either stouter than the other appendages, or of a very 

 distinct shape. (Text-figs. 2, 3, go). 



(e) A pair of shorter lateral processes from the ninth sternite are some- 

 times developed, lying close outside the bases of the gonapophyses. ( Text-figs. 

 2, 3, Ip). 



Excellent specific characters are afforded by these genitalia, and no descrip- 

 tion of a male caddis-fly can be said to be either sufficient or accurate unless 

 these parts are clearly figured, and their differences from those of related species 

 indicated. 



The end of the abdomen in the female lacks the specific variation found in 

 the males, but the development of the tenth tergite is often sufficiently peculiar 

 to offer a good specific character, and should most certainly be availed of when 

 describing a new species from females only. (See Text-figs. 4, 5). 



The four new species described in this paper are four of the most beautiful 

 Caddis-flies yet found in Australia. Two of them will be found figured in one 

 of the coloured plates accompanying the article on "Insects'" in the forthcoming 

 Australian Encyclopaedia of Messrs. Angus and Robertson, Sydney. 



Family POLYCENTROPIDAE. 



Genus STENOPSYCHODES Ulmer, 1916. 



Ulmer in Arkiv for Zoologi, Bd. 10, No. 13, p. 5, figs. 7-11. 



Genotype: St. mjobergi Ulmer (op. eit., p. 8), described from two males 

 taken on Bellenden Ker, N. Queensland. 9 unknown. 



This remarkable genus is only doubtfully placed by Ulmer in the family 

 Polycentropidae, owing to the fact that the last segment of the maxillary palpi 

 is not very clearly annulated, and also because it possesses characters indicating 

 affinities in other directions. Ulmer considers that it comes nearest to Pseudo- 

 stenopsyehe Dohler, from Chile; but, as only the female of this genus is known, 

 the comparison is by no means complete. 



Three new species are here assigned to this genus, and in two of these the 

 female is known. It is possible, therefore, to extend the generic definition given 

 by Ulmer, so as to include the characters of both sexes. 



Head: Ocelli absent. Eyes prominent. In the male, the head is produced 

 forward into a long rostrum, resembling that of Plectrotarsus; this is formed 

 from the labrum and labium, the palpi of the latter being placed close up to the 

 apex of the rostrum. In the female, these parts are not produced, and there is 

 HO definite rostrum. Antennae strongly built, longer than the forewings; their 



