MADEIEA AND THE CANARY ISLANDS. 181 



The erytlircea group is one of extreme difficulty. It is probable 

 that a solution may be found in tbe form of the genital parts of 

 the second segment in the 6 ; but it should be remarked that 

 I find slight variation in this respect in series of individuals from 

 the same locality, even in three S before me from Orotava. 

 De Selys has kindly lent me, for comparison, the types of ferrio- 

 rjaria (which he considers a synonym of sanguinolenta, Bur- 

 meister) and inqicinata, Eambur. The c? of the former would 

 seem to have the abdomen less broad, and with very considerable 

 difference in the genitals of the second segment ; but these latter 

 are probably distorted. As for inquinata, the type is a $ , and 

 colour appears to be the principal character, the wings being 

 more broadly yellow at the base, which colour is continued along 

 the costal margin as far as the pterostigma. 



GompJiina. 



GrOMPnus, sp. ? 



Madeira {HarUmg). 



Hagen (Ent. Month. Mag. ii. p. 27) says a species from Madeira 

 is in the collection of Prof Heer, but he had not seen it ; he 

 suggests that it is possibly G, similUmm, Selys. Probably it is 

 the same species to which De Selys refers under Gomphus Lucasii 

 in the ' Monographic des Gromphiues,' p. 138. 



Msclinina. 



Anax formosus. Van der Linden. {^schna formosa, BruUe, 

 Hist. Canar, ii. pt. 2, p. 82. — A. formosus, Hag. Ent. Mouth. 

 Mag. ii. p. 27.) 



Madeira (TVolIaston, &c.). 



Canaries {Wehb ef Berthelot, &c.) ; Tafira, 1500 feet, 8th 

 December, and near Palmas, 10th December, G-rand Canary 

 {Eaton) ; Santa Cruz de Teneriffe, 28th December {Eaton). 



In all probability this is the large Dragonfly referred to by 

 most writers who have mentioned the insects of the islands ; and I 

 think it is a true native. Hagen (Ent. Month. Mag. I. c.) suggests 

 that it may have been introduced with eggs of Sana esculenta in the 

 same manner as there appears to be some reason to believe it was 

 introduced into Sweden {cf. Hagen, Eevue des Odouates, p. 391). 

 But there is no necessity to suppose accidental or intentional 

 introduction ; an insect of such great power of wing could easily 

 paf<s over from the mainland, or vice versa. I do not find any 



