NORTHUMBERLAND AND DURHAM. 223 



double broods; whilst the other localities, Manchester (47-7°), 

 Newcastle (47°), Edinburgh (46-6°), Upsala (40°), and Casan, 

 (35'8°), where we know the insect only appears once in the 

 year, are to the north. 



From all these facts and circumstances, I think I am justified 

 in uniting the three forms of this butterfly under the single 

 name of Agestis ; and in doing so it affords me great satisfaction 

 to be enabled to state that our first British Lepidopterist, Mr. 

 Doubleday, to whom I have submitted these remarks, concurs. 



I regret the length to which this digression has run, but as 

 the cause of the dispute arose from our local specimens, I think 

 our Transactions are the proper place to record an attempt to 

 settle it. 



Family 5. HESPERID^, ZeacA. 



20. NiSONIADES, Hub. 



1. N. Tages, Linn. 



Papilio Tages, Linn. S. Nat. ii. 795. — Huh. Pap. 456, 457. 



^Wood Ind. Ent. t. 3, /. 76. Thymele Tages, Steph. 



^Hlust. Haiist. i. 98. Thanaos Tages, Staint. Man. i. 65^ 



Larva. Huh. Gesch. Pap. II. Gens. E. 1. and E. a. 2. — 



Dup.Icon. i.pl. 32,/ 93. 



Common in most parts of the counties in dry lanes and on 



heaths at the end of May and during June. A second brood in 



August. It is enumerated in the Twizell fauna and in Orns- 



by's Durham. 



21. Pamphila, Fab. 

 1. P. Sylvanus, Fab. 



Hesperia Sylvanus, Fab. E. S. iii. 1, 326.— J7w5. Pap. 482- 



484. Papilio Sylvanus, Don. Brit. Ins. viii. 8, pi. 254, 



y: 25. — Wood Ind. Ent. t. 3,/ 80. Pamphila Sylvanus, 



Steph. Illust. Ilaust. i. 101. — Staint. Man. i. 68. 



The only species of the genus yet met with in these counties, 



although I expect to add at least another (P. Comma) before my 



catalogue is complete ; but the evidence is not at present suffi- 



