38 [February, 



three figures of roboricolella, snlicolella and iahulella are all probably 

 hetulina ; roboricolella certainly is, salicolella and tahulella might be 

 either hetulina or salicolella (auct.), but neither of them is sepium 

 (tahulella'). Further proof is hardly required to show that Bruand 

 bad got his specimens here inextricably mixed at the time he prepared 

 for publication ; but that he had before him, when he worked them 

 out, four species, and knew them well at some of their stages seems 

 almost equally certain. He does not give the neuration of anicanella. 

 But taking his account of the ^ imagines as being least likely to 

 be in error, as being also that which must be decisive in a case of doubt, 

 bis salicolella is hetulina, ZelL, and partially perhaps sepium, and his 

 anicanella is the one we mean when we talk of salicolella, and is the 

 species represented by Mr. Front's bred examples, by Dr. Mason's 

 example of uncertain but doubtless British origin, and by the remains 

 of a specimen sent me by Dr. Staudinger. 



This portion of the synonymy would therefore be — 

 Betulina, Zeller (Speyer ?). 

 salicolella, Bruand. 

 roboricolella, Bruand (pars.). 

 Anicanella Bruand. 



salicolella, auct., nee Bruand. 

 Sepium, Zeller. 



tahulella, Bruand. 

 salicolella, Bruand (pars.). 



The only alternative I see to this is that salicolella, Bruand, is a 

 lost and unknown species, and our salicolella is a n. sp., which is 

 highly improbable. 



Betula, Reigate : 



November ^Ith, 1899. 



HOW TO REAR NYMPHS OF DRAGON-FLIES, &c. 



BY JAMES G. NEEDHAM, PH.D. 



{Extracted from the Bulletin, of the United States National Museum, No. 39). 



The best way to rear nymphs is to let them rear themselves. 

 Locate them, collect a few from time to time to watch their growth, 

 preserve the young ones for specimens, and do not take any for 

 rearing until about grown. Their development can be gauged by the 

 length of the wing cases. For species that seem common, and that 

 live in accessible places, there is no advantage in early collecting ; 

 they will seem to become more common as the season of their 



