370 MB. J. N. HALBERT : NOTES ON ACARI, 
Lasioseius (Lasios.) ombtes, Oudevi. (PI. 20. figs. 8 a-c.) 
A Lasioseius found undei' the bark of trees in Ireland seems referable to 
this species. I have to thank Dr. Oudenians for kindly lending me his type- 
specimen for comparison. 
Form as in L. muricatus, C. L. Koch (Berlese, 1, Fasc. xli. n. 6). Sternum 
with a wide and deep cleft in the posterior margin extending to about the 
middle of the plate ; the sides of the cleft are usually irregular in outline. 
Metapodial plates vestigial. Genital plate of the usual shape, punctured ; 
end margin rather, strongly chitinized ; immediately behitid it are four small 
linear plates arranged in a transverse row. Ventro-anal plate very large^ 
with distinct transverse markings ; side margins concave towards apex ; the 
end margin is somewhat truncated, and reaches the posterior margin of the 
body. The peritreme is normal, and its plate is continuous with the inner 
pedal plate, the extremity of which reaches the third coxse. Tritosternum with 
rather short processes ; its base lies in the central depression of the bow- 
shaped jugular bar. Fixed chela with a row of about ten small teeth, and 
there are three teeth on the free chela (fig. 8 c). Legs, palps, and capitulum 
much as in L. muricatus, C. L. Koch. Length 580 /j. ; breadth 319 /m. 
Localities. Females found under bark of decayed logs at Tallaght, and in 
the Carton Demesne, Co. Kildare, in May. — (See note on p. 392.) 
Lasioseius (Lasios.) l^laptoides (BerL). 
1887. Epicrius leelaptoides, Berlese, 1, Fasc. xl. n. 10. — 1916. Berlese, 10, p. 33. — 
1921. Berlese, 15, p. 82. 
Locality. Female found under damp wood lying on the ground in the 
Tolka Valley, near Finglas, Co. Dublin, in May. Not previously recorded 
from Britain. 
Lasioseius (Episeius) glaber, BerL, var. curtipes, nov. (PI. 20. fig. 9.) 
General structure as in the type-form (Berlese, 1, Fasc. xxx. n. 9^; differs 
in the much shorter first pair of legs ; in his description of these, Berlese 
says : " antici exiliores, corpore fere duplo longiores," and his accompanying 
figure shows the first logs much longer than the body. In the present variety 
the first legs are only slightly longer than the body, and the remaining pairs 
are somewhat stouter. The ambulacra are of the modified, bristle-like type. 
The genital plate is longer and the ventro-anal plate is broader. Triigardh has 
described a variety (minor, Triig., 46, p. 432) found in the Sarekgebirge ; from 
this the present variety may be known by the more stronglj^-prodnced meta- 
podia, and the form of the ventral plates is different. 
Female. Dorsum with scale-like mai-kings, which are distinct only towards 
the margins. Hair armature weak, stronger towards end margin, on which 
