WITH UESCKIPTIONS OF NEW SPECIES 
373 
I. A raised tubercle present near end of dorsum in both sexes.* 
A. Tlie extremities of tlie metapodial plates slope downwards in an oblique line 
towards the body marg'ins. 
a. Male : Length 495 fi, breadth 330 /i. Caloar of mandible (PL 20. fifr. 11) long, 
consisting of a thickened rib and narrow blade, tlagelliform, curved strongly 
downwards under the maxillary plate, extremity sinuate. Female : Length 
640 ^l, breadth 420 /i ; body usually broader and more rounded than in the 
following- species. Length of first leg 71 6 fx, of fourth leg 768 fi. (Localities : 
Streams at Glencullen, Glencree, Kilmashogue, in the Dublin Mountains ; 
Reservoir at Greystones, July. Lambay Island, July, &c.) 
Lasioseius (E^nseius) italicus, Berl. 
b. Male : Length 495 fi, breadth 330 \i. Calcar of mandible (fig. 12) long (length 
about 210 /J, not including base of mandible), almost straight except at the 
apex, where it is deflexed. Length of first leg 470 /*, length of fourth leg 
614 fj. Female: Length of type 640 /n, breadth 390 /x; length of first leg 
692,,; length of fourth leg 768/ii. (Locality: Mill Bay, Land's End, 
England ; taken by Mr. A. D. Michael in November 1892.) 
Lasioseius [Episeius) viichaeli, sp. nov. 
B. Extremities of metapodial plates truncated, lying in a straight line across the 
venter. Male unknown. Female described in 23, p. 78. Length about 
740,1, breadth 486 m- Length of first leg 742 ,i, of fourth leg 820 /i, 
including ambulacra. (Locality : Mountain-stream near Glencree, May.) 
Lasioseius (Episeiiis) temiipes, Halbt. 
II. No tubercle at end of dorsum. 
Male: Length 520 ,i, breadth 874 (u. Calcar of mandible (fig. 13 fi) short (length 
about 70 fj., not including base of mandible), straight, or slightly curved ; apex 
deflexed. Female (fig. 13 a), length 740 /n, breadth 486 ;«. Body broadly pj'ri- 
for, posterior margin somewhat flattened. Veutro-anal plate large (length 
220 fi, breadth .396 /j), distinctly reticulate. Length of first leg 820 ,<, of fourth 
leg 890 II. (Localities : Streams at Kilmashogue (S & $ , December) and Glen- 
cullen (9 ?, October), Mill Bay, Land's End, England (J & ?, November,' 
coll. A. D. Michael).) Lasioseius (Episeius) major, sp. nov. 
Lasioseius (Platyseius) subglabbe (Oudem.). (PI. 20. fig. 14.) 
1906. Hypoaspis subfflabra, Oudemans, 36, p. 88. 
A very distinct species, evidently referable to the subgenus Platyseius, 
Berlese (10, p. 42). Char;icteristic features are the broad pyriform shape and 
the very long hairs fringing the side margins of the dorsal sliield. Tiiese 
hairs are arranged in an irregular double row and are incurved ; on the end 
margin are two shorter, straight hairs. Length 560-600 fi, breadth 430 (i. 
Length of first leg 666 /a, of fourth leg 717 /x. 
* The male of L. (E.) tenuipes is unknown. In a recent paper on Swiss Acari, 
Dr. Schweizer described and figured what he considers is the male oi E. tenuipes, HnVot. 
(41, p. 43). I was struck by the similarity of the male calcar there figured with that of 
L. (E.) major now desci'ibed. Dr. Schweizer very kindly sent me some mounted specimens 
( $ 2 ) ^01' examination (locality, Quellcn am Kellersee, 4. iv. 1819) and they are undoubtedly 
referable to this species. The male calcar figured (PI. 21. tig. 18) agrees well with that of 
my type of I. {E.) major. 
LINN. JOURN. — ZOOLOGY, VOL. XXXV. 27 
