WITH DESCRIPTIONS OF NEW SPECIES. 369 
CoPRiPHis (Alliphis) halleri [G. et R. Can.). 
1881. Gamasus halleri, G. et R. Canestrini, 19, p. 1077. — 1882. Lmlaps halleri, G. Can- 
estrini, 20, p. 57.— 188o-'99. Iphis halleri, G. Canestrini, 18, p. 93.— 1892. Iphis 
halleri, Berlese, 1, Fasc. Ixvii. n. 6. 
Localities. Males and females occurred commonly in decayed roots of 
Henbane at Clontarf, near Dublin, in August 1918, and under bark of cut 
pine-logs on the Royal Canal bank in October 1918. Canestrini records 
it as occurring in decayed potatoes and amongst rotting leaves in 
December. 
Lasioseius (Lasios.) gracilis, sp. nov. (PI. 20. figs. 7 a-c.) 
Female. Shape ovate, shoulders not marked. Dorsal plate large, almost 
completely covering body, surface with polygonal markings. Hairs long, 
formed of a strong rib and blade, curved and serrulate, those on end margin 
exceptionally so (length 65 /x). Frontal bristles shorter and strongly pec- 
tinate. Sternum of moderate size, corners not produced between the coxse ; 
hinder margin straight, with rounded corners about on a level with end of 
second coxae. Metasterna small. Genital shield broad posteriorly and rather 
strongly narrowed towards the front ; lying behind it are two thin chitinous 
bars and two pairs of hairs. Ventro-anal plate of medium size, a little 
broader than long (length 145 (jl, breadth 150 fi), flattened in front and 
regularly rounded behind. Anal aperture placed a little in advance of the 
centre of the plate. Inguinal plates linear, placed near side margins. 
Maxillary plate transverse, evenly rounded at base ; corniculi with their 
apices trifid, directed inwards, and there is a strong hair at their bases. 
ChelicerfE small; fixed limb swollen at the base, where there are four sharply- 
pointed teeth placed close together ; free chela with an oblique chitinous 
blade and traces of two or three teeth just before the apex. Palps normal. 
Legs of moderate length, rather slender, furnished with short, curved hairs, 
some of which are minutely spiculate ; length of first leg about 352 /a, 
of fourth leg 363 //., not including ambulacra. Length 474 fi, breadth 
310 /i. 
Dr. Ondemans has partially described (37, p. 17) the protonymph, deuto- 
nymph, and adult of an Acarid which he calls Seiulus plumosus, though it 
seems doubtful if all of the forms are referable to the same species. L. gracilis 
is allied to " Seiidus plumosus," but the legs are obviously longer and more 
slender, and the hairs of the dorsum are much longer and not so strongly 
blade-shaped as tliey are in the Dutch species, which was found on a bat 
( Vespertilio dasycneme) and on a Squirrel (Sciurus vulgaris). 
Locality. Found on sprouting potatoes at the Albert Model Farm, near 
Dublin, by Mr. J. Gr. Rhynehart, early in March. 
