the Early Stages of Paltostoraa scliineri. 183 



I liave no hesitation^ for the other reasons given above, in 

 referring the larvae to P. schiiierh 



The main purposes of this paper are : {a) description of 

 the ? imago of P. schineri; (b) description of the larva and 

 pupa ; (c) description of the mouth-parts, and some other 

 structural points, of the S imago; (d) some discussion of 

 the affinities of Paltostoma as indicated by P. schineri in all 

 its stages, and comparison with the allied South African 

 KeUoggina barnardi, Edwards. I am indebted to Messrs. W. 

 R. Thompson and F. Balfour-Browne, of the Cambridge 

 Zoological Laboratory, for assistance and suggestions. 



One of the ? imagines, with specimens of larvae and 

 pupae, has been presented to the British Museum. The 

 other ? imago and the bulk of the larval and pupal material 

 are in the Cambridge University Museum. 



II. Collection of the Material. 



The locality in which the ? imagines were captured is 

 fifteen miles or more from that in which the larvae and pupse 

 were found two years before, but both places are on the 

 course of streams flowing down the southern slopes of tlie 

 range which runs right across the north of the island. 



The two ? imagines were obtained in January 1914 on 

 the Arima River, at an elevation of about 600 feet ; the time 

 was about 10 a.m., and the sun was shining, but the flios 

 themselves were in a shady place. They were hoveiing over 

 a spot where a thin fllm of water rushed over large stones, 

 and they appeared to Urich to be searching for a suitable 

 place in which to oviposit. He adds that in flight thev 

 looked like small Tipulids. He states that he has manv 

 times swept foliage on the banks of streams in the Northern 

 Range, but has never succeeded in capturing any Blepharo- 

 ceridae in that way ; he has not observed any on flowers or 

 attacking other insects [cf. p. 193 of this paper), nor has he 

 been attacked by them while bathing or at any other time. 



It is noteworthy that the larva a?id pupce were taken at 

 an elevation of only about 50 feet above sea-level. Urich has 

 found Blepharocerid larvae at various places, mostly in the 

 streams of the Northern Range, from almost sea-level up to 

 2000 feet, above which no observations have been made. The 

 material dealt with here was collected on March 22nd, 1912, 

 in a waterfall in the Diego Martin district. The fall ran 

 down very steep smooth faces of rock, interrupted by 

 narrow ledges. Only a very thin sheet of water swept over 

 the clifl', for the dry season was at its height, and in addition 



