WITH DESCRIPTIONS OF NEW SPECIES. ,389 
The type-species of the genus, H. ruber, de Geer, is common and wide- 
spread in Ireland (PI. 22. fig. 30), as is also H. prolongatus, Thon (PI. 22. 
fig. 31), which is sometimes recorded as a variety of the former ; in my 
experience it is rather the exception to find both of these occurring in the 
one locality. The first-mentioned has been found in ponds and lakes in 
Donegal, Antrim (L. Neagh), Monaghan, Galway, Wexford and Dublin, and 
the latter in Donegal, Dublin, Kildare, Galway and Kerry. H. prolongatus 
is perhaps of more frequent occurrence. The eye-plate and palps of a curious 
form, which must, I think, be regarded as an aberration of H. prolongatus, 
are figured (PI. 22. figs. 32 a, b). The general structure is as in the species^ 
but the eye-plate is smaller and narrower especially across the front margin 
(length along middle line 363 /i, breadth 373 /a), and the median eye is 
placed much nearer the middle of the plate. Unfortunately, only one 
specimen was found in a small lake on Lough Salt Mountain, in Donegal. 
H. bayeri, Pisarovic (PI. 22. fig. 33), is apparently rare ; I have found a 
single specimen in a drain by the River Shannon, at Portuinna, in June. 
H. bayeri nonundulata, Viets (PL 22. fig. 34) was found in a pool at the 
entrance to Glenshelane Valley, at Cappoquin, Co. Waterford, in June. It has 
also occurred under stones on the marshy edge of Bount Brown Lough, near 
Westport, in Co. Mayo. The water-level of the lough had fallen considerably 
at the time (July 1911). In the structure of the eye-plate this form bears a 
strong resemblance to H. planus, Thon, but the plate is more abruptly 
narrowed behind the anterior corners, the breadth across the hinder part is 
relatively greater, and the posterior emargination is less deep than in H. planus. 
The median eye is placed far back as in the type. Viets records this form 
from Eastern Prussia (47). H. crassipalpis, Koenike, was found in ponds near 
Enniscorthy, Co. Wexford, in May. This species may be easily recognized by 
the form of the eye-plate and the short, thick palps ; described by Dr. Koenike 
from Borkum and the neighbourhood of Bremen, where it is rare (27). At 
Killarney I have found a Hyclryphantes which seems referable to a form of 
this species. The eye-plate (PL 22. fig. 35 a) is smaller (length along middle 
line 298 li,, breadth 418 yu.) and the anterior corners are most acute ; the sides 
are more deeply indented, and the posterior emargination is deeper. The 
palps (fig. 35 b) are shorter (length about 300 fjC) than in the typical form ; 
the second segment (length 110 /x) has four short dorsal spines on the upper 
surface and three longer, feathered hairs placed at the upper corner of the 
inner surface of the segment. This form, which may be called lacustris, 
forma nov., was found in Loosecaunagh Lough, between Killarney and 
Kenmare, in the month of April. II. placationis, Thon (PI. 22. fig. 36), not 
common ; found in ponds near Galway in June, and in ponds in the Phoenix 
Park, Dublin, in April. H. dispar (Schaub) is apparently rare in Ireland; 
found in company with the preceding species in ponds in the Phcenix Park 
in April. The eye-plate is figured (PL 22. fig. 37). 
LINN. JOURN. ZOOLOGY, VOL. XXXV. 28 
