78 T. THORELL, 
1833. Manduculus Buackw., Charact. of some undescr. gen. and spec. of Aran., p. 110. 
1841. Linyphia Waucx., H. N. d. Ins. Apt., II, p. 233 (ad partem). 
1861. Pachygnatha WEsTR., Aran. Suec., p. 144. 
1864. > Buackw., Spid. of Gr. Brit., II, p. 318. 
1864. + Sim., HL. N. d. Araignées, p. 229. 
1860. ji MENGE, Preuss. Spinn., I, p. 94. 
Type: Pachygnatha Clerckii SUND. 
WESTRING, BLACKWALL, MENGE and others have already remarked 
the close analogy between this genus and Yetragnatha among the Epeiroidæ 
in the structure of the male's palpi, the form of the mandibles, ete.: it was 
even referred by SUNDEVALL, when he first described it, to his "Retiariz" 
i e. the Zpeiroide. — The superior tarsal claws are in this genus rather 
large and powerful, yet slender, pretty uniformly curved, strongly pectinated, 
with several (12 or less) long, straight teeth; the inferior claw is small, 
with one very small blunt tooth. The palpal claw in 9 is under the 
middle provided with a few close-set teeth gradually increasing in length. 
A remarkable genus, which by the form of its large diverging man- 
dibles seems to be related to Pachygnathu, is Prodidomus HENTZ (Aran. 
of the United States, im Bost. Journ. of Nat. Hist., V, p. 466): it is said 
to show "some of the characters of Clubiona and Theridium”. 
+ Gen. 2. FORMICINA CANESTR. 1868. 
Deriv.: Formica, ant. 
Syn.: 1868, Formicina CANEsTR., Nuovi Aracn. Ital., p. 197. 
Type: Formicina Mutinensis CANESIR. 
This to me unknown genus is said by CANESTRINI to be related to 
Pachygnatha: it has however not the mandibles diverging almost at a right 
angle, but only slightly diverging at the extremities. The most distinguish- 
ing feature of the genus is, that the petiolum, which unites the cephalo- 
thorax and abdomen, is long and nodose, thus giving these spiders a certain 
resemblance with ants. The 4 intermediary eyes form a trapezium: the po- 
sterior pair are farther distant from the side-eyes than from each other; 
the anterior are so close as almost to touch each other. The side-eyes are 
contiguous, the cephalothorax tolerably long and narrow; the relative length 
of the legs: 1, 2, 3, 4. See CANESTR., loc. cit.; Aran. Ital, p. 118. 
