508 



Far back, at the outer side, the base of the bulbus is drawn out 

 into a tolerably fine yellowish brown spine, blunt at its extremity" 

 which just at the base is directed inwards, but immediately after- 

 wards curves upward and subsequently downwards and backwards, 

 bo that the bulbus, when viewed in profile, seems to be armed be- 

 hind with a long, downward- and backward-pointing hook. The man- 

 dibles are long, curved forwards, and sinuated so as to leave a nar- 

 row oval interval between them: their base is not armed with a 

 tooth in front near the outer side. 



(Pag. 469.) Jjatrodectus malmignathus. 



Lathrodectus tredecim-giittatns (Kossi) 1790. 



Syn.: 1790. Aranea 13-GUTTATA Rossi, Fauna Etr., II, p. 136, Tab. IX, fig. 10. 



1805. Latbodkctus 13decim-guttatus Walck.., Tabl. d. Aran., p. 81. 



1806. Theridion tredecim-guttatum Latr. , Gen. Crust, et Ins., I, p. 98. 

 91825 — 7. Latrodectus argus Sav. et Add., in Descr. de l'Egypte, 2 e Ed., 



XXII, p. 353, Arachn., PI. Ill, fig. 10. 

 1838. „ 13-GUTTATUS C. Koch , Die Arachn., IV, p. 39, Tab. 



CXIX, fig. 273. 



1838. „ conglobatus id., ibid., p. 41, Tab. CXlX, fig. 274. 



1841. „ . malmignatus Walck., H. N. d. Ins. Apt., I, p. 642. 



91841. „ oculatus id., ibid., p. 645. 



9184.. „ ARGUS Luc, in Webb et Berthelot, H. N. d. lies 



Canaries, Entom. , p. 35, PL 6, fig. 6. 



The synonyms of the species of the genus Lathrodectus are very 

 difficult to determine, for almost all the writers who have hitherto 

 occupied themselves with the study of these animals, have, to di- 

 stinguish the species, fixed their attention almost exclusively on the 

 differences that present themselves in the colour and markings, which 

 however can be very variable in one and the same species of this ge- 

 nus. The independence of most of the hitherto described species is 

 therefore very problematical: it is not even certain, that more than 

 one species of Lathrodectus is met with in Europe. Duges '), as is 

 well known, thinks, that not only the Egyptian L. argus Sav. et 

 Aud. or L. oculatus Walck., but also luguhris (Duf.), L. erebus 

 Sav. et Aud. and L. venator Sav. et Aud. are only varieties of L. 

 13-guttatus. L. venator 2 ) would seem however not to belong to the 



1) Observ. sur les Aran., in Ann. d. Sc. Nat., 2 Ser., VI, p. 196. 



2) Descr. de l'Egypte, 2« Ed., XXII, p. 354, Arachn., PI. Ill, fig. 11. 



