( 3 ° ) 
SPECIES XL — A. Montanus. 
MOUNTAIN-SPIDER. 
Of this fpecies of Spider, reprefented at plate 3, fig. 4. No. i. I had the fatisfacHon of 
ohferving the whole procefs of generation, from firfl: to laft, about the middle of June. Hav- 
ing firfi: taken all the prudential caution which is ufed by the Rett ary Spiders (and which is 
defcribed by the illuftrious De Geer, in his oration, publickly recited at Stockholm, on the 
refignation of his office of prefident, in the year 1754, June 26th) they made their approaches, 
and united in fuch a manner, that the anus of the one being applied to the neck of the 
other, the male could conveniently reach with his arms the lower part of the abdomen of the 
female. From a fmall aperture in the abdomen of the female, proceeded a flender whitifli 
body or tube, of almoft a line in length, which the male embracing with his fexual organs, 
protruded from the tips of his arms, comprefled with reiterated applications, but with great 
feeming caution. This operation did not continue long, but was foon fucceeded by reft j 
within an hour, more or lefs, they united again, but at each time with lefs feeming fear, and 
greater familiarity. At length when the whole procefs was finiflied, they feparated v^^ithout 
any remarkable appearance of dread. 
For the gratification of thofe who are not in poflelfion of the above celebrated oration of 
De Geer, on the Generation of Infers, and who are ftationed in fituations where it may not 
eafily be procured, I ftiall here infert as much as relates to the elucidation and confirmation 
of this matter. 
Although De Geer had himfelf obferved Spiders engaged in this procefs, and found 
the following experiment probable, yet he has thought proper to quote the folid obfervations 
of Lyonnet, which are adjoined to the Theologia InfeStorum of Lesser, in which is contained 
the defcription of the nodules, which terminate the arms of the males, or, as he calls them, 
the antennae. “ Thefe arms” (fays Lyonnet) ‘‘ are extremely remarkable. Perhaps 
I ftiall not eafily be believed, if I fay that they are the male organs of generation. Yet I may 
fafely aflert what I have often feen j and that certain kinds of Spiders copulate by thefe in- 
ftruments. 
