"WITH DESCRIPTIONS OF NEW SPECIES. 367 
and ventro-anal shields are remarkably long and narrow, o£ almost equal 
breadth, and the latter reaches to within a short distance of the end margin 
o£ the body. 
Locality. Both sexes occurred under the moist bark o£ cut pine-logs lying 
on the Royal Canal bank, close to Dublin, in October 1918. The logs had 
been bi'ought from an inland locality. 
Myonyssus decumands, TiraboseJie. 
A few adult females were found on a Field Mouse {Mus sylvestris) caught in 
the Rocky Valley, Co. Wicklow, by Dr. R. F. Scharff. On the same host 
were adults of Lcelaps stabulasis, C. L. Koch, and L. agilis, C. L. Koch. It 
has been found on the common Brown Rat in England (Hull, 25), and 
Waterston records its occurrence on the House Mouse in the Shetland Islands. 
Antennophorus uhlmanni, Haller. 
A single specimen was found in a nest of the ant, Lasius mixtus, Nyl., near 
Graiguenamanagh, in Co. Kilkenny, by Mr. A. W. Stelfox. This is the only 
Antennophoms hitherto found in Ireland ; all the described species, four 
in number, have been recorded from England. 
L^LAPS (Iphis) aculeifee, Can. 
1983. Lcelaps aculeifer, Canestrini, 17, p. 6. — 1885. Hy2ioaspis amileifcr, Canestriiii, 18, 
p. 84.— 1892. Lcelaps aculeifer, Berlese, 1, Fasc. Ixviii. n. 10. 
Evidently a fairly common species. I have found the female in numbers 
under bark of decayed trees at Tallaght in April and Greystones in July, 
under pieces of damp wood in the Tolka Valley in January, and in decayed 
potatoes at Drumcondra in April. All these localities are in the vicinity of 
Dublin. 
L^LAPS latisteknus, sp. nov. (PI. 20. fig. 4.) 
Female. Shape broadly ovate, shoulders not prominent. Dorsal plate very 
large, surface with scale-like markings ; hairs short, becoming longer towards 
end margin, where there are two comparatively long hairs. Sternum very 
wide and strongly produced between the coxse at its anterior and posterior 
corners, end margins slightly undulate, hairs rather long. The genital plate 
is also rather large (length about 165 ^u.), marked with lines as in figure. 
Peritreme comparatively straight, not fused with the pedal plates ; the latter 
are well developed and enclose the fourth coxse ; small obliquely-placed 
inguinal plates lie close to them. Ventro-anal plate small (length 220 yu., 
breadth 176 /u.), subovate, flattened at end and reaching margin of body. 
Epistome in the form of a long, sword-shaped, central spine and two strong 
lateral teeth. Maxillary plate rather narrow (77 yx). Palps normal. Legs 
long and robust, first pair of very uniform thickness (length about 506 fx) ; 
the fourth pair (length 550 /i) have slightly curved femora, and the tarsi are 
elongate ; there are traces of a division of the terminal part of the tarsus close 
