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where the chelipeds should be situated, but they are probably constric- 
tions, due to the downward curvature of the rostrum. The organs 
_with which the leaves are punctured are two long, slender chelicera, 
which lie in the hollow snout, and extend beyond the tip of the 
latter when in use. The lower lip is a triangular body attached 
beneath and at the base of the snout, covering the beginning of the 
longitudinal slit. Briosi says that it may be extended forward so as 
to close the slit when the snout is applied to the leaves for the pur- 
pose of sucking the sap. The adult Phytoptus has only four legs. 
With two or three exceptions, adult mites of other kinds have eight 
legs, and their larve never have less than six. Phytoptus is thus an 
exception to the rule, in this respect. 
The developed limbs consist of five articles, with an appearance 
of two others; the first is stout and extends but little beyond the 
side. At its extremity is a fold, which resembles a short article be- 
tween the first and second. The second is longest and stoutest of 
all. In the first pair of legs, a short hair arises from the under side 
of this article, and in both pairs a long hair arises at its apex above, 
and extends on over the succeeding articles. Then follow two arti- 
cles, the second (distal) of which bears a constriction at about its 
middle, which gives it the appearance of two segments. From the 
last article a long hair arises and extends forward over the tarsus. 
The tarsus consists of a curved, cylindrical claw, slightly swollen at 
its tip. Beneath it is the so-called feather-lke organ, consisting of 
a slender axis with a series of barbs arising from each side. : The 
long abdomen is transversely striate, the regular striz separating 
its surface into narrow rings, which completely encircle the body. 
These rings or interspaces are covered with a series of minute tu- 
bercles, only visible when highly magnified. The extremity of the ab- 
domen is a sucker, which can be freely protracted and withdrawn. 
The genital opening is situated just behind the margin of the 
cephalothorax on the under side, and is covered by a shield-shaped 
flap. A few slender hairs arise from the abdomen, and as 
they are quite constant in position, should be mentioned. There are 
three pairs of these above and three below. The first of the upper 
pairs is long, and arises at the margin of the cephalothorax; the 
second pair is the longest of all, being in some species a third of 
the whole length, arises from the last interspace, and extends 
posteriorily. Between them is the shortest pair of all, (frequently 
overlooked). In a species having 80 striw I find the most anterior 
of the ventral pairs of hairs twelve, and the median twenty-four 
strie behind the cephalothorax, and the third pair six strizw in ad- 
vance of the sucker. 
The internal anatomy of Phytoptus needs further study. The 
alimentary canal has not yet been traced through all its course. 
The ovary, when distended with ova, occupies nearly all of the ab- 
dominal cavity, extending from the opening near the margin of the 
cephalothorax backwards nearly to the tip of the abdomen. The 
ova are comparatively very large, and lie in a single series of about 
six. Those farthest forward, and thus nearest the genital opening, 
are always largest and farthest developed. The anterior two or three 
show distinctly the granular character of their contents, and differ 
little from eggs which have been laid. Towards the hind end 
