106 ME. E. M'lACHLAN on THE INSECTA COLLECTED 



condition of isolation or segregation that necessarily exists, and 

 which must, in my opinion, result in the production of local 

 forms, which in extreme cases are worthy of the term "species." 



In concluding this introductory portion I must express my 

 thanks to Capt. Feilden for the assistance he has rendered me, to 

 those gentlemen who have worked out certain groups, and to the 

 officers of the British Museum for the courtesy exhibited on my 

 various visits to that Institution in order to examine the mate- 

 rials collected by former expeditions, and which will now be aug- 

 mented by the addition of those enumerated in this Eeport. "With 

 these remarks, I pass on to a detailed examination of the collec- 

 tions*. 



HTMENOPTEEA. 



BOMBDS EALTEATUS, Dalllhoill. 



Three from Hayes Sound (lat. 79°, Aug. 4th, 1875) ; Port 

 Eoulke, July 28th, 1875 ; and lat. 81° 45' {Feilden). 



This (I am informed by Mr. F. Smith, who kindly examined 

 the jBomli) is the species described by Curtis in the Appendix to 

 ' Eoss's Voyage ' as B. Kirhjellus. It was also found by the 

 * Polaris ' Expedition. A known Arctic species, occurring also in 

 Lapland. 



B. poLAEis, Curtis. 



One <S from Hayes Sound {Feilden). A known Arctic Ame- 

 rican species t- 



IcHNEUMONIDJi]. 



Ichneumon erttheomelas, n. sp. 



Black ; mesonotum, scutellum, and second abdominal segment 

 bright red. Antennae very stout, 82-jointed, totally black, with 

 very short yellowish microscopic pubescence. Eyes dark liver- 

 coloured. Head finely sculptured. Mesonotum and scutellum 

 finely punctured ; the latter flat, narrower behind than in front, 

 somewhat rounded anteriorly. Metanotum (and the sides of the 

 entire thorax) finely punctured ; the areas well defined by narrow 

 raised keels, central area narrower in front than posteriorly. 



* A slight sketch of some of the results of the expedition was published by 

 me in the ' Entomologist's Monthly Magazine,' vol. xiii. p. 181 (January 1877). 

 This was drawn up after a hurried glance over the insects of scarcely more than 

 a few minutes' duration, and is very faulty. 



t From Disco {Feilden and Hart) are 5 $ and 2 ^ of 5. hyperhoreiis, Schonherr 

 {B. arcticus, Kirby, B. aljainus, O. Fab. nec L.), which, however, did not appear 

 to occur further north. 



