Insects. 773 



intricate. But it is remarkable, that in the umbilicus and baud all 

 these specimens are alike, and resemble N. glaucina : a circumstance 

 which does not excite in my mind any doubt of their being of differ- 

 ent species, and that those having lines of arrow-shaped marks are a 

 young state of N. intricata : for I believe that the observation of Prof. 

 E. Forbes may be depended on ; that colour in the Naticoe is distinc- 

 tive of species, but at the same time it tends to show that in their 

 younger state they resemble each other in that which subsequently 

 constitutes their most important difference. In their youthful condi- 

 tion, then, the marking of the body-whorl, and the depressed and ir- 

 regular form of the spire must be regarded as the chief distinctions ; 

 to which in the adult state must be added the situation and structure 

 of the band, and the umbilicus intersecting it ; but how far this shell 

 is thus separated from the foreign species of Naticae described by au- 

 thors, I have not the means of knowing. J. Couch. 

 Polperro, Oct. 6, 1844. 



Note on Polyommatus Agestis fyc. In your last No. (Zool. 682) you gave your 

 opinion that P. Agestis, P. Salmacis and P. Artaxerxes were mere varieties of the same 

 species : the variety being the result of locality. I have in my small collection P. 

 Salmacis, which I captured on Durdham-down, Bristol. The cabinet of one of my 

 friends contains a similar specimen taken in the Isle of Wight; and that of another 

 some of your central and northern varieties caught in the vicinity of Clifton, Bristol. 

 This, I think, tends to weaken your theory of climates, while it somewhat confirms the 

 opinion of those who would identify P. Salmacis with P. Agestis. I have subjoined a 

 few of my captures this year. 



Eupithecia strobilata, June 19 Anacampsis diffinis, July 20 



rufifasciata, June 20 decorella, June 28 



exiguata, July 2 angustella, bifasciella, leucatclla 



suburnbrata, July 1 1 Aphelosetia marginea, June, September 



pusillata, June 1, August 4 fulvescens, rufipennella, June 



subfulvata, August 8. Porrectaria albicosta 



venosata, June 27 lutaria, June, August 



Triphosa cervinata, April 25, July 15 Harpagus cinctella, May 14 



Aventia flexula, July 20 Achmia fusco-viridella 



Paccilochroma nigricostana, June guttea, May 14 



Grapholitha Trauniana, July Pancalia fusco-amea, June 



Steganoptycha triquetrana Microsetia pygmaeella, aurella, May 20 



cinerana, rhombifasciana,cuspidana, posticella, pulchella, guttella 



pavonana, Bseberana, are all one spe- Chsetochilus sequellus, July 12 

 cies. Fifty-one specimens caught on a Tinea pellionella, May 4, August 12 

 wall near my house, August 3 semifulvella, June 27 



Anacampsis Mouffetella, July, August Lepidocera Birdella, June 20, eighteen 



domestica, July 29 specimens, caught on a wall near my 



