NOTES ON BRITISH TRICHOPTERA. 151 



series. I am doubtful however if the females that I de- 

 scribed really belong to this species, as I found R. dorsalis 

 sparingly in the same locality, and I am quite unable to 

 find any good characters by which to separate them from 

 the same sex of the latter. I may mention that I saw an 

 old specimen of M. obliterata in the late Mr. Ingall's Col- 

 lection. 



Rhijacophila munda, M^Lachlan. This species also oc- 

 curred in North Wales, in the river Ceiriog at Chirk, on 

 the borders of the principality, and a single specimen at a 

 stream running into the east side of Bala Lake. 



Agapetus. Dr. Hagen informs me that A. fanercusy 

 Stephens (Annual, 1860, p. 81, 79), is tomentosus of 

 Pictet, and that ciUatus (p. 81, 80) is comatus, Pictet 

 {laniger, Stephens). 



Polycentrojius. I have lately examined the neuration of 

 all the British species, and find great differences; in fact, I 

 tliink that P. concinnus, Hagen, Annual, 1861, p. 5, 93 (nee 

 Steph.), will form the type of a new genus. 



PJiilopotamus ? colavihina^ Pict. At the June meeting 

 of the Entomological Society I exhibited an insect under 

 this name on the authority of Dr. Hagen. That gentleman 

 now informs me that he has received from M. Pictet a type 

 of his columbinaf which, though it does not agree with the 

 description, he assures him is the species he intended should 

 bear that name. This is a small true Philopotamus, with. 

 five apical forks in the neuration, whereas H. occipitalis^ 

 Pict., with which my supposed columhina is congeneric, has 

 only four. My insect is probably undescribed. 



Aphelocheira flavomaculatUy Stephens. Mr. B. Cooke 

 called my attention to a curious structure in this insect, viz., 

 that from between the 4th and 5th abdominal sesfments there 



