Page:VCH Buckinghamshire 1.djvu/152

Rh pair of spinners are set close together at the base, and the maxillae are convex, and not impressed in the middle. 2. Micaria pulicaria (Sundevall) Colnbrook (Webb) 3. Clubiona pallldula (Clerck) Chipping Wycombe (F. P. S.) 4. Clubiona corticalis (Walckenaer) Colmbrook (Webb) 5. Zora maculata (Blackwall) Burnham Beeches (Webb) 6. Micrommata vtrescens (Clerck) (O.P.C.)

Spiders with eight eyes, situated in two transverse rows, two tarsal claws and anterior spinners close together at their base. Maxillae not impressed. The crab-like shape and side- long movements of these spiders are their chief characteristics, enabling them to be easily distinguished from the more elongate Drassidæ and Clublonidæ.

7. Philodromus dispar, Walckenaer Colmbrook (Webb)

The spiders of this family may be recognized in a general way by their mode of progression, consisting of a series of leaps. More particularly they may be known by the square shape of the cephalic region and the fact that the eyes are arranged in three rows of 4, 2, 2, the centrals of the anterior row being much the largest. Otherwise the spiders are simply specialized Clubionids with two tarsal claws and other minor characters possessed in common with other members of this family.

8. Marpissa muscosa (Clerck) Colmbrook (Webb)

Spiders with eight eyes in three rows, and three tarsal claws. The first row of eyes consists of four small eyes which are sometimes in a straight line, sometimes recurved and sometimes procurved. Those of the other two rows are situated in a rectangle of various proportions. Pisaura runs freely over the herbage, carrying its egg-sac beneath the body.

9. Pisaura mirabilis (Clerck) Colmbrook (Webb) ; Chipping Wycombe (F. P. S.)

Very common ; adult in June and July. Known also as Dolomedes or Ocyale mirabilis.

The members of this family have also eight eyes, similarly situated to those of the Pisauridæ, the tarsal claws also being three in number. The spiders are to be found running freely and carrying their egg-sac attached to the spinners. Many of the larger species make a short burrow in the soil and there keep guard over the egg-sac. 10. Lycosa ruricola (De Geer) Chipping Wycombe (F. P. S.) 11. Lycosa pulverulenta (Clerck) Colmbrook (Webb) 12. Pardosa pullata (Clerck) Colmbrook (Webb) 13. Pardosa lugubris (Walckenaer) Burnham Beeches (Webb) 14. Pirata hygrophilus, Thorell (O.P.C.)

Spiders with eight eyes, situated in two transverse rows. Legs with three tarsal claws. The species of this family spin a large sheet-like web, and construct a tubular retreat at the back of it, which leads to some crevice amongst the rocks or the herbage or the chinks in the