210 
orange, with the margin of a brilliant green. 
GENITAL AREA.—Three discs on each side of the 
median line as shown in fig. I. 
PALpr.—About 0:22 mm. Second joint hasa strong 
short spur. The fourth segment spoon-shaped. 
(Fig. 3.) 
Fic. 3. &. versicolor. Palpus of Male. 
FEMALE.—Length about 0°60 mm. Width about 
o’48 mm. Is shorter and more oval than the male. 
It has a small notch on the posterior margin, which 
is a very uncommon feature in water mites. The 
depressed line in the female runs all round the margin, 
on the dorsal side of the body. Colouring same as 
that of male. The fourth pair of legs are without the 
spurs we find in the male. (Fig. 2.) 
LocaLitirs.—Common everywhere. I have taken 
hundreds of specimens in different parts of England. 
Although so common, there is only one species at 
present known in this genus. The proportion of 
males to females, as far as my own collecting has 
gone, indicates one male to eight females. 
(To be continued.) 
ARRENURUS INTEGRATOR Miiller. 
This mite is of a dark greenish blue colour, and 
rather small. The male is without the peculiar 
Arrenurus tntesrator. 
appendage on the penultimate internode of the fourth 
leg. Mr. Soar’s accompanying drawing is so charac- 
teristic that it requires little description. In SCIENCE- 
Gossip for April, 1884, page 80, I described and 
figured a mite, which at that time I mistook for 4. 
integrator. In colour and size it is very like that 
species, but differs in having a notch in the centre of 
the posterior edge of the tail, whilst in 4. zutegrator 
that part is rounded and without a notch. 
Piersig has named this mite difdicodulus. Mr. 
Soar’s figure in next column shows the difference very 
“like crystals, composed of a resinous substance. 
e 
SCIENCE-GOSSI/P. 
Ilis measurements are :—Arrenurus tnte- 
00 long and 0°56 mm. broad; 
plainly. 
erator, mm. 
A. bifidicodulus. 
A. bifidicodiulus, 0:88 mm. long and 0°68 mm. broad. 
I have found these mites on several occasions, so 
that I cannot consider them rare. 
Kirton-in-Lindsey. C. F. GEORGE. 
GLANDULAR Hairs oF AURICUILA.—The appa- 
rently powdered appearance of the mealy variety of 
Auricula, furnishes an interesting microscopic object. 
A piece of young leaf (or flower-stalk when obtain- 
able), should be carefully cut off, with as little 
disturbance of the surface as possible. It may then 
be placed without other preparation in the stage- 
forceps, or the contrivance can be used as suggested in 
ScieNcE-Gossip for May, 1899. A good light should 
be thrown on by the bull’s-eye, and an inch or 14in. 
objective used. It will be found that what appear to 
the unaided eye mere dusty particles, are in reality 
somewhat complicated objects, being in fact, multi- 
cellular hairs. They consist of three cells, a cone- 
shaped basal one attached by the broad end. On the 
apex of this there is a short cylindrical one, which is 
crowned by a globular head. rom this latter radiate 
in all directions tiny glistening white rodlets or needle- 
This 
must be removed before the secreting and supporting 
hair-like body can be examined. The application of 
gentle heat, as from an extinguished but still glowing 
match, held near, will accomplish this. The best way 
is to immerse the leaf in alcohol—methylated spirit 
will do—for a few minutes. When dry, the object 
should be viewed from various aspects with the light 
carefully directed. The structure described will then 
be beautifully shown, especially at the leaf margin. 
—Jas. Burton, 39, Ingham Road, West Hampstead. 
