382 ME. J. N. HALBERT : NOTES ON ACARI, 
forms may be present in the same individual. The capitulum is very large 
and wide in relation to the length (breadth about 40 /a), truncated in front 
and obtusely round at the end margin. Epimera of the first pair of legs 
strongly defined. The first two pairs of legs are sliort and stout ; the long- 
terminal hair of the end pair is strongly recurved. 
Male (PL 21. fig. 21 h). Form of the main body much as in female (length 
180 ^-215 /A, breadth 85/A-100/:i). The capitulum is less transverse (breadth 
35 yu.), and the hair armature is stronger, there are two pairs of long hairs on 
the cephalothorax. Legs short and stout ; fourth pair (PI. 21. tig. 21 c) shaped 
much as in 2\ Jioricolus, being without blades ; second segment straight^ 
inner margin slightly sinuate at the extremity ; two hairs are present. 
Third segment armed with a long spine-like hair, and at the base is another 
shorter hair. As in T. brevipes the front margins of the third and fourth 
epimera are ill-defined. 
The male larva is as long as the adult (length 215 /a), due to the large size 
of the post-abdominal part. Epidermis distinctly striated. Legs stout and 
of very uniform size. The terminal part of the abdomen is strongly 
constricted and is narrower (breadth about 50 /x) than the main body, and 
there are two stout outwardly curved hairs :it the apex. 
The eggs of this species are large (length 125 fi-1'65 /u,, breadth 65 /a), they 
are of a regular long oval form and the surface is marked with numerous 
light-refracting punctures. 
Locality. Found in numbers in partly decayed Narcissus bulbs in I'ounty 
Dublin, January. The place of origin of the bulbs is uncertain. 
At least three other species of Tarsonemus have been found in Ireland. One 
of these, noticed injuring oats at Killyarden, Co. Donegal, in August last, is 
possibly referable to T. sjnrifex, Marchal, the female agreeing well with 
Korff's figure of this species which is reproduced by Sorauer (Handbuch der 
Pflanzen-Krankheiten, iii. p. 102). The male of T. spirifex has the fourth 
pair of legs peculiarly modified, and until this sex is found this identification 
must remain somewhat doubtful. 
The form of this female is a regular long oval (length 235 /a, breadth 110 /a) . 
The capitulum is rather broad (breadth 35 fi), but less so than in T. laticeps. 
The sensory organs are very distinctly leaf-shaped with sliarply pointed 
extremities. The first two pairs of legs are short and stout. 
This species was communicated by Dr. G. H. Pethybridgej who tells me it 
attacks oats in much the same way as T. cidmicolus, Renter, attacks meadow 
grasses in Finland. Renter says the mites are found on the haulm, presum- 
ably within the leaf-sheath within the first node; they suck out the juices so 
that the inflorescence wilts and dies. 
Females of 2\ Jioricolus were found on gooseberry plants at Lisburn, Co. 
Antrim, in July- 
Colonel Samman tells me he finds Acarapis woodi. Hirst, commonly in the 
tracheae of Irish honey-bees. 
