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 A HISTORY OF BERKSHIRE ARACHNIDA Very few collections have been made of members of this order in the county of Berkshire. The following list, including 61 species, were taken for the most part by the late Lieut. -Colonel Arthur Pickard, V.C., R.A., in the neighbourhood of Windsor Castle, and the late Rev. C. W. Penny of Wellington College, Wokingham : ARANE^ ARACHNOMORPH& DYSDERID^E Spiders with six eyes and two pairs of stigmatic openings, situated close together on the genital rima ; the anterior pair communicating with lung books, the posterior with tracheal tubes. Tarsal claws, two in Dysdera, three in Harpactes and Segestria. 1. Harpactes bomber gn (Scopoli). 3. Segestria bavarica, C. L. Koch. Windsor (A.P.) (O.P.-C.) Common ; April to July. OONOPID/E 2. Segestria senoculata (Linnaeus). 4. Oonops pulcher t Templeton. Windsor (A.P.) (O.P.-C.) Common ; July. Rare ; adult in July. 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 Drassidts and Clubionldee, 5. Thomisus onustus (Walckenaer). 7. Philodromus elegans, Blackwall. Wokingham (C.W.P.) Wokingham (C.W.P.) 6. Philodromus aureolus (Clerck). Windsor (A.P.) SALTICIDjE The spiders of this family may be recognized in a general way by their mode of pro- gression, 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. Salticus scenicus (Clerck). IO. Attus pubescens (Fabr.) Windsor (A.P.) Windsor (A.P.) 9. Hasarius arcuatus (Clerck). Wokingham (C.W.P.) PISAURID^: Spiders with eight eyes in three rows of 4, 2, 2 ; the small anterior eyes being some- times in a straight line, sometimes recurved and sometimes procurved. Those of the other two rows are situated in the form of a rectangle of various proportions and are much larger than the eyes of the anterior row. The tarsal claws are three in number. Pisaura runs freely over the herbage, carrying its egg-sac beneath the sternum ; while Dolomedes is a dweller in marshes and swamps. II. Pisaura mirabilis (Clerck). 12. Dolomedes fimbriatus (Walckenaer). Wokingham (C.W.P.) Wokingham (C.W.P.) Known also as Dolomedes, or Ocya/e, mirabilis. 120