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bles are, as in T. pinicola cf, almost vertical , but shorter and thicker,egg-shaped, and the large spine on the upper side of the mandibleshas its extremity tapering and truncated, not dilated and cloven oremarginated at the apex, as in T. Nowickii cf, nor brought to apoint, as in T. pinicola cf. (A female, taken in company with thatmale, seems to differ from T. Nowickii g by a shorter and thickerabdomen and somewhat shorter legs.) This form may be distinguishedby the appellation T. brachygnatha.

I have hitherto employed L Koch’s nomenclature for the formsbefore us, but for trvo of them, T. externa and T. Nowickii, it willbe necessary to alter it. Among all the examples of the genusTetragnatha which I have collected here at Upsala , the place whereLinnaeus resided, there is not a single one of T. externa L. Koch,which species seems to be totally absent from the northern provin-ces of Sweden . The form usually met with here is T. Nowickii.T. extensa Thor., Rec. crit. Aran., p. 107, includes only T. Nowickii(and T. obtusa). It is further to be observed that Westring’s T.extensa is identical with T. Nowickii, and does not include T. extensaL. Koch, according to the information communicated to me in reply tomy inquiries by Westring himself. T. extensa Scnd. is certainly aclmax. part. = T. Nowickii, for even of the numerous specimens exa-mined by me, which were collected in different parts of the mostsoutherly province of Sweden , Sk&ne, the greatest part belong toT. Nowickii. As therefore it is not probable that Linnaeus was ac-quainted with T. extensa L. Koch, but undoubtedly in the first placeby his T. extensa meant T. Nowickii L. Koch, and as also otherSwedish arachnologists have, either exclusively or principally, by thename of T. extensa (Linn.) designated T. Nowickii I conceive thatI ought to restore the Linnean specific name extensa to that form.T. extensa Menge, at least the male (fig. A), is also probably iden-tical with T. Nowickii; the Ar. or Tetr. extensa of sundry otherwriters, as for example Fabricius, ought in all probability in thefirst place to be classed under the same form.

As I wish to avoid increasing the number of synonyms to T.extensa L. Koch with a new name, I accept for that form the nameT. Solandri (Scop.) 1763. That Scopoli’s Ar. Solandri at least prin-cipally indicates that form of the genus Tetragnatha which is commonest' in central and southern Europe , i. e. T. extensa L. Koch, and not thatwhich is most frequently met with in Scandinavia , there seems to

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