463 



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 mandibles 

 has its extremity tapering and truncated, not dilated and cloven or 

 emarginated at the apex, as in T. Nowickii cf, nor brought to a 

 point, as in T. pinicola cf. (A female, taken in company with that 

 male, seems to differ from T. Nowickii 5 by a shorter and thicker 

 abdomen and somewhat shorter legs.) This form may be distinguished 

 by the appellation T. brachygnatha. 



I have hitherto employed L Koch's nomenclature for the forms 

 before us, but for two of them, T. externa and T. Nowickii, it will 

 be necessary to alter it. Among all the examples of the genus 

 Tetragnatha which I have collected here at Upsala, the place where 

 Linn.eus resided, there is not a single one of T. extensa L. Koch, 

 which species seems to be totally absent from the northern provin- 

 ces cf 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. Noivickii, and does not include T. extensa 

 L. Koch, according to the information communicated to me in reply to 

 my inquiries by Westring himself. T. extensa Sund. is certainly ad 

 max. part. = T. Nowickii, for even of the numerous specimens exa- 

 mined by me, which were collected in different parts of the most 

 southerly province of Sweden, Skane, the greatest part belong to 

 T. Nowickii. As therefore it is not probable that Linn^us was ac- 

 quainted with T. extensa L. Koch, but undoubtedly in the first place 

 by his 1\ extensa meant T. Nowickii L. Koch, and as also other 

 Swedish arachnologists have, either exclusively or principally, by the 

 name of T. extensa (Linn.) designated T. Nowickii I conceive that 

 I 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 other 

 writers, as for example Fabricius, ought in all probability in the 

 first 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 name 

 T. 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 that 

 which is most frequently met with in Scandinavia, there seems to 



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