undescribed Genera and Species of Araneidae. 105 



Maxillae greatly enlarged at the base externally, where the 

 palpi are inserted, and inclined towards the lip, which they 

 encompass. 



Lip short, broad, prominent at the apex, and semicircular. 



Legs moderately robust ; the anterior and posterior pairs, 

 which are the longest, equal in length ; the third pair is the 

 shortest. 



The name of M. Savigny, which 1 have bestowed upon this 

 genus, is connected with highly interesting discoveries in this 

 department of zoology. 



Savigniajrontata. 

 Cephalothorax oval, convex above, with a minute indenta- 

 tion in the medial line of the posterior region, and an acute 

 perpendicular eminence of a conical form in front, surmounted 

 by a tuft of fine hair. Mandibles small, dentated on the inner 

 side, and inclined towards the pectus, which is heart-shaped. 

 These parts, with the maxillae and lip, are of a brownish-black 

 colour. Legs and palpi brown, with a tinge of red. Each 

 tarsus has three claws at its extremity; the two upper ones 

 are finely pectinated, and the inferior one is abruptly inflected 

 near its base. The fourth and fifth joints of the palpi are ex- 

 panded laterally ; the former projects an apophysis in front 

 tapering into an acute point curved outwards ; both are con- 

 vex externally, concave within, and are connected with the 

 sexual organs, which are highly developed, complicated in 

 structure, and of a very dark red-brown colour. Abdomen 

 oval, rather convex above, projecting over the base of the ce- 

 phalothorax; it is sparingly clad with hair, glossy and black. 



Length, from the anterior part of the cephalothorax to th& 

 extremity of the abdomen, T ^th of an inch ; breadth of the 

 cephalothorax, which equals that of the abdomen, ^ ; length 

 of a fore leg T ] G . 



The above is the description of a male, which sex is found 

 in considerable abundance, in the months of October and 

 November, on rails" in the immediate vicinity of Crumpsall 

 Hall, near Manchester. I have not yet succeeded in captur- 

 ing a single female ; and concerning the ceconomy of the ani- 

 mal, I can merely state that it is active during the day. 



The short and broad lip, the converging maxillae, the large 

 intervals between the eyes (those of the lateral pairs excepted), 

 and the difference in the relative length of the legs, at once 

 distinguish this spider from the species constituting the genus 

 Dysdera, to which it is nearly allied. 



Genus, Walckenaeria. 

 Eyes eight in number, unequal in size, disposed in pairs 



Third Series. Vol. 3. No. 14. Aw. 1833. P 



