254 [April, 



and began to re-appear at first singly, then several together, and then 

 each cut out for itself a tiny film from the under cuticle of the leaf, 

 and floated away on it just as I have described above, and by the 18th 

 of the month the water was crowded with tiny cases not one-eighth of 

 an inch long. After moulting the black colour of the head of the 

 larva became brownish ochreous, the collar-plate still black, the body 

 dirty whitish with broad greenish dorsal vessel, and by help of a strong 

 lens I could see the fine opaque whitish tracheal thread ; the larvae 

 continued to thrive and were frequently making fresh cases, half at a 

 time, until the period arrived for hibernation, when the cases were 

 spun up flat against the leaves, and, content with what I learnt, I sent 

 them adrift to take their chance in a state of freedom. 

 Emsworth : March 3rd, 1881. 



DESCRIPTION OF A NEW SPECIES OF TPICHOPTERA (POLY- 



CENTROPUS KINGIJ FROM SCOTLAND. 



BY R. McLACHLAN, F.R.S., &c. 



POLYCENTROPUS KlNGI, 11. Sp. 



In size and general appearance much resembling P. flavo-maculatus and multi- 

 guttatus, especially the latter. The dark poriions of the anterior-wings more pro- 

 nounced, and nearly black, more decided in the spots and spaces on the costal 

 margin : apical fork No. 3 sessile, or with a more or less long footstalk. 



In the S the dorsal plate is oblong, with nearly parallel sides. Superior 

 appendages testaceous, with pale hairs, rather short, the apical margin scarcely 

 excised. Intermediate appendages testaceous, divergent, 

 flattened, considerably dilated at the base, but gradually 

 attenuate to the acute apex, inserted near the base of the 

 dorsal plate beneath. Inferior appendages moderately large, 

 sub-oblong, convex externally, the apical margin oblique 

 and somewhat excised ; sub-testaceous, with pale hairs, but 

 the margins are fuscous or blackish. Inserted above each of 

 these latter appendages, and lying partially in their concave 

 upper (or inner) portion, is a, yellow flattened supplementary 

 appendage, fringed with very long pale hairs ; viewed 

 laterally, they appear almost linear, because in that position 

 only the edge is seen. Penis very long and stout, yellow, 

 directed downward between the inferior appendages, sub- 

 cylindrical, obtuse ; at its apex is an appearance as of a short 

 recurved process, "which is only occasionally visible. The $ presents no decided 

 differential characters in the dry insect. 



Expanse, <? , 14£— \Q\ mm., ? , 17—18 mm. 



Strathglass, Inverness-shire, August, J. J. King, about twenty 

 examples. 



Like most other species of the genus, this is practically separable 



