Vll 



the pupa of this species is deprived of the long hairs which exist, in other 

 species, on the tirst four joints of the fore and middle legs, and which the 

 pupte, after leaving the case, use in swimming to the surface. On the 

 rocks it is, of course, neither necessary nor possible to swim. Should not 

 Brauer's S(£totricha be a Helicopsyche? the neuration of the wings is veri- 

 similar to that of our species. =:= In the pupa of Helicopsyche ceijUmica, 

 Brauer [" Voyage der Novara,' Neuroptera) describes the first joint of the 

 maxillary palpi in either sex as being much shorter than the second ; but 

 this is not the case with our species, which in their maxillary palpi agree 

 with StEtotricha. Perhaps there may not be any real diflerence in this 

 respect between H. ceylanica and the J^raziliau species. Brauer's figure of 

 the palpi o{ Helicopsyche looks as if there were something wanting at the 

 base. There are several other differences between the larvfe and pupae of 

 Helicopsyche I have examined and Brauer's description oi H . ceylanica ; 

 whether they be real or not I am unable to decide. The anterior margin 

 of the pronotum of the larva is armed, in our several species, with a row 

 of strong spines, straight or curved at the end. The branchiae described 

 by Brauer I have been unable to find in any of our species. The hooks at 

 the apex of the abdomen are quite different from Brauer's description. 

 The lateral tubercles of the first segment of the abdomen are beset with 

 pairs of microscopical spines. In describing the legs of the pupa, Brauer 

 says that the skin of the pupa bears but few hairs; if indeed the fore and 

 middle legs of the pupa were hairless, or nearly so, H. ceylanica would 

 probably not live in the water, but on wet places, where the pupa is not 

 obliged to swim. According to Brauer there should be a pair of horny 

 plates, armed with hooks, on the back of abdominal segments 2 — 6 ; in our 

 species these exist only on segments 3 — 6, but there is a second pair on 

 segment 5, with the hooks curved in.an opposite direction. Brauer's figure 

 of the apex of the abdomen shows it as deprived of appendages. I cannot 

 help tiiinking this must be an error ; all our species have well-developed 

 appendages bearing the usual four long hairs. 



" The pupae of a species of Hydropsychidce. living on the same rocks 

 here likewise have hairless legs, and this is also the case with the species 

 of LeptoceridcB which inhabits Broniclitv, while, in a closely allied species f 

 living in rivulets, the hairs on the fore and middle feet are well-developed, 

 as you will see by the pupa-skins I send you. 



* I have already called attention to the probability that Sictotricha may be 

 allied to Helicopsyche, in my ' Eevision and Synojisis of European Tricboptera ' 

 (pt. v., p. 20!), Nov. 187C).— JR. M'L. 



+ This insect belongs to Section iv. of Leptuceridce, according to the system 

 adopted in my • Revision and Synopsis of European Tricboptera.' It probably 

 forms a new genus allied to Anisocentropus and Ganonema. The cases of it, and of 

 that inhabiting the Bromelite, are formed of large pieces of leaves (or entire small 

 leaves) attached llatly in a luugitudiual niainiLr. — 11. M'L. 



