1875.] 493 [ThorelT. 



and strongly rovnded in E. Paclardii 6 . This last named species is 

 perhaps still more closely allied to E. carlonaria L. Kcch, 1 the male 

 of which is unknown to me: it is said to hare the denticulated edge 

 of the above mentioned process rounded, as it is in E. Packardii, but 

 the anterior thighs of E. carbonaria <S are, according to L. Koch, 

 blackish above, and the posterior thighs have two black lines on the 

 sides ; the breadth of its cephalothorax equals the length of tibia of 

 the fourth pair; it appears also to be larger than the species from 

 Labrador. 



3. Tetragnatha extensa (Linn.), forma principalis. 



Arcinea externa Linn., Syst. Nat., ed. 10, J, p. G21. (1758.) 



Tetragnatha Nawiclii L. Kcch, Beitr. z. Kenntn. d. Arachn.-fauna 

 Galizr, pp. 13, 15. (1870.) 



Tetragnatlta externa fcima T. extensa vera Thor., Eem. on Syn., p. 

 459. (1873.) 



An adult male Tetragnailia (in which however the abdomen is 

 wanting) does not appear to me to differ from the true T. extensa 

 (Linn.) or T. Nawiclii L. Kcch, by anything more than its smaller 

 size and by the yellowish triangular spot on the dark sternum being 

 less distinct. The cephalothorax, mandibles, maxilla?, palpi and legs 

 are brownish-yellow, only the extreme apex of the tarsi blackish. 

 The distance between the lateral eyes is somewhat less than that 

 between the anterior and posterior centrals. The mandibles are 

 somewhat shorter than the cephalothorax; they have no tubercle or 

 spine near the apex above besides the ordinary great spine, which 

 is slightly curved at the extremity; the extreme apex of this spine is 

 slightly emarginate, with the anterior (exterior) lobe longer than the 

 other. • The armature of the claw-furrow is as follows: the anterior 

 margin has first a rather small tooth directed somewhat backwards, 

 which is placed opposite to the fifth tooth of the posterior margin; 

 then follows a very long and strong, almost straight, tooth (not 

 weaker, and but little shorter than the great bilobed spine) ; behind 

 this, at a somewhat greater distance, are three pointed, gradually 

 smaller teeth. The posterior margin has near the basis of the claw 

 one very small and one rather long tooth (longer than the next fol- 

 lowing) ; then, after an interval double as great as that between the 

 next following teeth, comes a row of six teeth gradually diminishing 

 in size. The long lobe, or apophysis of the tibial joint of the palpi, 



1 Beitrage z. Kennt d. Arachn.-fauna Tircls, in Zeitschrift d. Ferdinandeunis, 

 1869, pp. 168, 206. 



