Irish Species of Kylais. 511 
Raheny, Grand Canal near Dublin, also in Lough Gur, 
Co. Limerick. 
This variety is closely allied to H. variabilis, Sig Thor, 
recently described from Norway. Here, again, the uniformly 
larger size of the eye-plate obtains. In vardabilis the inner 
corner of the third palp-segment bears fewer, longer, and more 
distinctly feathered spines. 
Eylais triarcuata, Piersig. 
1899. Zool. Anzeiger, Bd. xxii. p. 66, fig. 7. 
An Lylais closely resembling this species occurs rather 
commonly near Dublin and elsewhere in Ireland. In these 
specimens the central muscle-attachment invariably over- 
reaches the front margin of the eye-plate, but not so promi- 
nently as in Piersig’s figure. As this is a very unsatisfactory 
character, it may be best to record this species with reserve. 
The eye-plate (fig. 6) varies greatly in outline, and, as usual, 
Fig. 6, 
the posterior emargination may be truncate or evenly rounded. 
The capitulum also varies, and resembles that of Hylais 
Miilleri in structure. On the inner corner of the third palp- 
segment there are usually from 14 to 16 short spines, some 
of these are feathered. ’ 
Perhaps this Irish form should be referred to a variety of 
the North-American species H. triangulifera, Koenike, of 
which I have seen the types. So far as the eye-plates are 
concerned, the differences are slight. 
Eylais unisinuata, Croneberg. 
1962, Bull. Imp. Moscou, p. 98, figs. 9 a—c. 
Last June I took this species in some numbers in the 
