518 Observations on Hab its and Parasites of Common Flies 
of Chernes nodosus communicated to him from different parts of the 
country were obtained from the legs of flies” (Kew, 1901). In a recent 
paper Kew (1911) states that C. nodosus “often comes to notice on flies’ 
legs in Autumn/’ and mentions that C. Godfreyi has been found once 
attached to a fly by H. Hill (1907) but mistaken for the former species. 
During the summer and autumn of 1915 the writer observed specimens 
of C. nodosus attached to flies on several occasions. On Sept. 7 a 
specimen of M. domestica was caught with three of these pseudo- 
scorpions attached to its legs; while on Sept. 12 out of sixty-four 
house-flies which entered a room facing west two had single pseudo¬ 
scorpions attached to their legs. On Oct. 3 twenty-five house-flies 
entered this room, and one had a pseudo-scorpion clinging to the base 
of the tarsus of one leg, and on Oct. 20 another house-fly entered this 
room with a chelifer attached to its leg. A specimen of Ophyra 
leueostoma was caught outside on Sept. 5 with one specimen of C. nodosus 
and three mites attached to it; and on Aug. 3 a female L. vaginalis 
with two pseudo-scorpions symmetrically attached to opposite legs. 
A specimen of C. nodosus was also received on Oct. 15 which had been 
found on a female M. corvina. The most interesting capture, however, 
made on Oct. 16, was a Stomoxys with two specimens of C. scorpioides 
Herm. attached symmetrically to the femora of the middle legs. This 
appears to be the first time that this chelifer has been found on a fly 
in Britain. 
Kew (1911) gives the following descriptions of the chelifers which 
have been found attached to flies in Britain. 
Chelifer nodosus Schr. 
“Chelifer nodosus Schr., 1803. C. inaequalis Curtis, 1849. Chernes Reussii 
(C. L. Koch), L. Koch, .1873. Chelifer nodosus (Schr.), Simon, 1879. 
Palps and cephalothorax reddish-brown, abdominal tergites olive-horny; glossy, 
with nearly simple bristles. Cephalothorax weakly granulate at sides, dorsum 
non-granulate, second groove scarcely perceptible or absent ; abdominal tergites 
non-granulate reticulate, scar-spots indistinct, main sclerites near inner margin with 
1-3 bristles in front of row, tergite sternite xi with two pairs of tactile hairs, tergite 
with inner pair considerably shorter than outer; galea (?) well developed, branching 
from short base, branches simple rather long; palps trochanter with upper pro¬ 
tuberance distinctly dorsal, lower protuberance alone projecting posteriorly, its 
proximo-posterior corner moderately prominent but distinctly rounded, tibia strongly 
convex in front, hand (?) moderately broad obliquely high, anterior margin of fingers 
with an isolated accessory tooth; the palp is granulate, at least in front, with small 
part of femur and great part of tibia and hand smooth; lower face of maxillae 
smooth; coxae iv ($) short and broad, inner margin longer than posterior; legs iv 
