1881.J £1 



AN ANNOUNCEMENT OF NEW GENERA OF THE EPHEMERID&. 



BY THE REV. A. E. EATON, M.A. 

 {continued from Vol. xvii, p. 197). 



Calliarcys, n. g. 

 Allied to Habrophlebia and Thraulus, having forceps like those of 

 the latter, but hind-wings like those of the former in outline : cross- 

 veinlets in both wings more plentiful than in Habrophlebia. Three 

 long, sub-equal, caudal seta?, in £ nearly half as long again as the 

 body. Fore tibiae of £ about a sixth longer than the femur, the tarsus 

 half as long again as the same ; hind leg about one-sixth longer than 

 the intermediate leg ; hind tarsus about a third as long as the tibia ; 

 ungues of hinder tarsi dissimilar in form and size. Proximal joint of 

 o forceps' limb by far the longest. Type Calliarcys humilis, n. sp. 

 Distrib., Portugal and, perhaps, "W. Indies. 



Calliarcys humilis, n. sp. 

 Sub-imago. Wings tinted with greyish-black. 



Imago (dried), 3- Thorax deep black above, glossy; abdomen piceous with 

 pale joinings. Legs piceous, the hinder tibia? and tarsi rather paler. Wings vitreous, 

 slightly tinted with brownish ; their neuration piceous-brown. Forceps pale piceous, 

 or pale yellowish-brown. Seta? pale fuliginose, with reddish joinings. 



Long, corp., <? ? , 7 — 9 ; al., <? , 7 — 8 - 5, ? , 9 ; set., S , 10 — 11*5 mm. 



Hab. : common on the northern slopes of Foia, near Monchique, 

 and sparingly in other parts of Portugal. Mistaking the imago for 

 Thraulus, I did not search for the nymph. 



At p. 190, 1. 21 from bottom, after "sexes, and" insert "usually." 



The prior name, Isonychus, Mannerheim, precluding the employ- 

 ment of Isonychia,~Eti\., Chirotonetes maybe substituted for the latter. 

 It equals Baetis, Walsh, Section B. 



In Heptagenia and kindred forms, the first and second of the 

 axillary nervures in the fore-wing run sub-parallel with one another, 

 and rather close together, to the inner margin, meeting it either near 

 the anal angle, or at least midway between this and the wing-roots. 

 The nervures interposed between the first axillary and the anal 

 nervure constitute a definite abbreviated group, and do not simulate 

 short branchlets of the anal nervure (in Siphlurus, &c, they do). So 

 far as I have been able to ascertain, amongst forms ranked with 

 Heptagenia in 1871 (= Baetis of most authors, but not of Leach), the 

 chief differences in the proportions of the tarsal joints, discernible in 



