TRACHEARI^ 
323 
treniity; four eyes; the posterior legs longest; sucker projecting in 
the form of a conical or subulate rostrum. Found under stones, 
bark of trees, and in moss. 
Bd. longicornis ; Acarus longicornis,Yi. -, La Pince rouge. 
Geoff.; Scirus vulgaris, Herm., Mem. Apter., Ill, 9 ; IX, S. 
Hardly half a line in length;, scarlet; the feet paler ; sucker in 
the form of ap elongated and pointed rostrum ; quadriarticu- 
lated palpi, the first and last joint of which are the longest ; the 
latter somewhat the shortest of the two, and terminated by two 
setae. Common in the environs of Paris ; under stones *. 
Smaridia, Lat. 
Distinguished from Bdella by the palpi, which are hardly longer 
than the sucker, straight and without terminal setae ; by the eight 
eyes, and by the two anterior legs, which are longer than the others f. 
Sometimes these Ticks, with eight legs and without chelicerae, 
have no eyes that are perceptible ; their palpi are either anterior and 
projecting, but in the form of valvulee, widened or dilated near the 
extremity, serving as a sheath to the sucker — or inferior ; the parts 
composing the sucker are horny, very hard and dentated ; the body 
is invested with a coriaceous skin, or has at least, anteriorly, a scaly 
plate. 
These animals are parasitical, gorge themselves with the blood 
of several of the Vertebra ta, and from being extremely flat, acquire 
by suction a great volume and a vesicular form. They are round 
or oval. 
Ixodes, Lat. Fab . — C ynor h,est es, i/erm. 
The palpi forming a sheath to the sucker, and with it constituting 
a projecting and short rostrum, truncated and slightly dilated at the 
extremity. 
The Ixodes are found in thick woods abounding in bushes, briars, 
&c. ; they hook themselves to low plants by the hind legs, keeping 
the others extended, and fasten on Dogs, Oxen, Horses, and other 
Quadrupeds, and even on the Tortoise, burying their sucker so com- 
pletely in their flesh, that they can only be detached by force, and by 
tearing out the portion that adheres to it. They lay a prodigious 
quantity of eggs, which, according to M. Chabrier, are protruded 
from their mouth. They sometimes increase to such an enormous 
extent on the Ox and Horse, that they perish from the exhaustion. 
Their tarsi are terminated by two hooks inserted in a palette, or 
united at base on a common pedicle. 
The ancients designated these Arachnides by the term Ricinus. 
* Seims longirost)-is, Herm., Mem. Apter. VI, 2; — S. latiroslris, Ib., II, HI; — 
S. setirostris, Ib., Ill, 12; IX, T. 
t Acarus samhuci, Schrank, and perhaps the following Trombidia of Hermann; 
Tr. miniatum, 1, 7; — Tr. papiUosum, II, 6; — Tr. squammatum, Ib., 7- The second 
is even closely allied to the species which serves as a type to the genus. 
