366 MR. J. N. HALBERT : NOTES ON ACARI, 
produced in sharply-pointed processes between the coxeb. Peritreme undu- 
late, and protected by a narrow plate which reaches to the end o£ the fourth 
coxse. Ventro-anal shield very small, rotund, broader than long (breadth 
165 /ti), placed on the posterior margin of the body. Legs o£ moderate 
length, second pair slightly more robust than the two hinder pairs. Length 
742 fi, breadth at shoulders 430 /i, and in posterior third of body 512 fx. 
Larva. Shape much as in adult ; close to the end it slopes rapidly to a 
truncated central part of the posterior margin, at each corner of which 
is a curved hair; immediately behind these on each side are stouter hairs 
with slightly clubbed and spiculate extremities ; the dorsal hairs are weak. 
Dorsal shields undeveloped, and the epidermis at end of body is distinctly 
areolated. Legs and palps very stout, carrying numerous short hairs; ambu- 
lacra consisting of a single pair of rather narrow leaf-like upper lobes, and 
two long, lanceolate, lower processes. Length 340/4, breadth 198 /a. (PI. 20. 
fig. 3.) 
Nijniph.. Side margins more parallel than in the adult ; end margin 
truncated, with a small central part projecting below. Dorsal plates large, 
granular. Side margins of body with short hairs. Epistome, palps, and 
legs much as in the adult. Length 570 /i, breadth 320 jx. 
Locality. Adult female^, larva, and nymph found in decaying turnips, 
North Dublin, in April 1921. 
Macrochbles vagabundus {Berl.). 
1889. Holostas2ns vagabundus, Berlese, 1, Fasc. lii. ii. 8. — 1902. Oudemans, 37, pp. 11, 
43.— 1918. Berlese, 13, p. 172. 
Berlese places this species in the subgenus Maerocheles (sensu stricto, 13) 
of which the type is Acarus marginatus, Hermann. In the same paper he 
records vari^eties of M. vagabundus from South America, South Africa, and 
Australia, so that the species is of unusually wide range. It may be known 
, by the beautiful sculpturing of the dorsum, which, as well as being distinctly 
punctured, is ornamented with reticulations and branched chitinous markings 
on the epidermis. The strong, curved hairs on the margin of the dorsal plate 
bear numerous very short secondary hairs. 
Locality. The only specimens ( ? ¥ , length 930 /m) found in Ireland were 
under moist pieces of wood lying on the sea-bank at Malaliide, Co. Dublin, 
in September. 
Dendbol^laps cornutus [Kramer). 
1886. Seitis cornutus, Kramer, 31, p. 257. — Deitdrolcetaps bicornis, Hull, 25, p. .57. 
This species is well described and figured by Kramer (31), and is easily 
recognized by the presence of two long chitinous horns near the end of the 
dorsum in the male. In the female (length about 495 fi) the body is rather 
long and narrow. The sternum fills the entire space between the very large 
second coxae, and is gradually widened to its hinder corners. The genital 
