208 



Ins. Apt., I, p. 601) specially mentions, and which L. Koch (Die 

 Arachn. fam. d. Drassiden, p. 253) suspects to be different from Ch. 

 metrics, has by Canestiuni and Pavesi ') been, with good reason, de- 

 scribed as a separate species under the name of Ch. itahcntn. Also 

 the form here described by Westking, is specifically separated from 

 Ch. nutria: L. Koch 2 ), as Zimmermann 3 ) has already observed. We- 

 string's spider (of which I am in possession of fully developed speci- 

 cimens of both sexes determined by this author) ought in my opinion 

 to retain the old Walckenaerian name, as neither Walckenaer nor any 

 other author before L. Koch has mentioned the peculiar form of the 

 mandibles, which characterizes Ch. nutrix L. Koch cf- According to 

 L. Koch, the tibial joint of the palpi in his Ch. nutrix cT — or 

 Ch. oncognathum , as I propose to call that species — is three times 

 as long as the patellar, and the process at the apex not cloven; 

 the lamina is as long as the tibial joint, its spur as long as this 

 joint (and therefore as the lamina itself), the mandibles "im letzten 

 Drittheil kugelig aufgetrieben" ; all the thighs are iu Ch. oncognathum 

 without spines. In Ch. nutrix (Walck.) Westr. cT on the contrary, 

 the tibial joint of the male's palpi is scarcely more than double as 

 long as the patellar, and the process at its apex slightly cloven; the 

 lamina is at least as long as the tibial and patellar joints together, 

 its spur is shorter than the lamina, and reaches with its extremity 

 only to about the middle of the tibial joint, the mandibles are not 

 globularly incrassated at the extremity, not more bent outwards than 

 in e. gr. Ch. carnifex cT. The thighs of the 1 st pair have, as We- 

 string's says, one spine (before); in one specimen the thighs of the 

 3 rd pair also have a spine, behind, towards the apex, and in a third 

 specimen (from Germany) the thighs of the 3 rd pair have two and 

 the thighs of the 4 th pair one, towards the extremity. 



The colour of Ch. nidrix (Walck.), Westr., seems to be exactly 

 the same as that of Ch. nidrix C. Koch (Die Arachn., loc. cit.): the 

 abdomen in the only fullgrown Swedish male specimen I possess, is 

 pale brownish yellow, approximating to olive, with a longitudinal 

 reddish brown band, stretching from the base to the middle of the 

 abdomen and pointed behind, which exhibits a tooth-like dilatation 



1) Aran. Ital. , p. 114; Catalogo sistem. degli Aran. Ital., in Archiv. p. la 

 Zool., l'Anat. e la Fisiol., Ser. II, Vol. II (1870), Tav. IV, fig. 3. 



2) Die europ. Art. d. Arachn.-gatt. Cheirac, in Abhandl. d. Naturhist. Ge- 

 sellsch. zu Nurnberg, 1864, p. 3; Drassiden, p. 248, Taf. X, figg. 158-160. 



3) Verzeichn. d. Spinn. d. Umgeg. v. Niesky, p. 40. 



