On EUROPEAN SPIDERS. 171 
he adduces the different relative length of the two posterior pairs of legs: 
they are in JMiswmena "brusquement plus menues et plus courtes que les 
autres”, which is not the case in Heteropoda. Micrommata, according to 
LATREILLE, differs from both these genera in having the maxillæ straight, 
not inclined to the labium. The next year WALCKENAER (in Tableau des 
Aranéides) united Heteropoda and Misumena in one genus, which he called 
Thomisus, instead of retaining for it, as in justice he ought to have done, 
one of the Latreillian names. The genus AMicrommata he adopted unaltered, 
but gave also to it a new name, Sparassus ). In the Tabl. des Aran., 
Thomisus is divided into three sections: "les Hétéropodes”, answering to 
Misumena, and "les Équipèdes brévirostres" and "les Équipèdes longirostres”, 
both together answering to Heteropoda LATR. In Faune franç., Arachn., 
Livr. 11 et 12 (1825?), the French forms of WALCKENAERS Thomisus 
were by that author again divided between two genera, Philodromus and 
Thomisus, the first of which corresponds to a part of Heteropoda LATR., 
the last to Miswmena LATR. In the same work, a few years later (1830), 
the genus Delena was proposed (p. 110): afterwards WALCKENAER, as is 
known, created or adopted several new genera formed at the expense of 
his Zhomisus: Selenops, Clastes, Arcys, Eripus, Olios (= Sarotes SUND.). — 
WALCKENAER soon perceived the intimate connexion between JMicrommata 
LATR. or Sparassus and the spiders, which in his Tabl. d. Aran. form the 
8" family of Thomisus (Thom. leucosius or Ar. venatoria LINN. and others, 
for which he afterwards formed the genus Olios): in Faune Frang., loc. cit. 
we even find these latter referred to Sparassus, whereas LATREILLE had united 
them with the species of Philodromus, with which they have far less affi- 
nity. — 'The very different development of the posterior, compared with 
the anterior extremities in Misumena or Thomisus on the one side, and He- 
teropoda (Philodromus) and Micrommata on the other, probably still affords 
the best basis for the division of the Zhomisoide into larger groups, after 
the resolution of these old genera into a number of smaller; this basis has 
gained increased stability since attention has been called (by Ducks, On- 
LERT, and others) to the presence of hair-tufts (claw-brushes, claw-tufts, as 
I eall them) under the tarsal claws in the last two Latreillian genera, and 
the absence of them in the first-named. Simon also divides, chiefly on that 
principle, his family " Thomisiformes "into two tribes, " Philodromiens” and " Tho- 
1) LATREILLE soon submitted in part to this usurpation, and himself adopted a 
couple (Thomisus, Philodromus) of the names imposed by WALCKENAER. But this 
of course does not authorize us here any more than elsewhere to neglect the law of 
priority. 
