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 A HISTORY OF ESSEX THOMISIDjE 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 Drassidee and Clubionidee. 23. Philodromus dispar, Walckenaer. Broxted. 24. Philodromus aureolus (Clerck). Broxted ; Epping Forest (F. P. S.). 25. Philodromuf c&spiticolens, Walckenaer. Dunmow. 26. Tibellui oblongus (Walckenaer). Broxted. 27. Xysticus cristatui (Clerck). Broxted. 28. Oxyptila praticola (C. L. Koch). Chelmsford. 29. Oxyptila trux (Blackwall). Chelmsford. 30. Misumena vatia (Clerck). Earl's Colne. 31. Ditto dorsata (Fabricius). Broxted. ATTIDJE 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. 32. Salticus scenicus (Clerck). Dunmow. 33. Salticus cingulatus (Panzer). Danby Park. This species is not nearly so common as the last. 34. Euopbrys frontalis (Walckenaer). Broxted ; Epping Forest (O. P.-C.). 35. Neon reticulatus (Blackwall). Broxted ; Epping Forest (O. P.-C.). 36. Attus pubescent (Fabricius). Epping Forest (O. P.-C.). Known also as Salticus sparsus, Blackwall. 37. Ergane falcata (Clerck). Broxted. Known also as Salticus coronatus, Blackwall. 38. Heliophanus flavipes, C. L. Koch. Chelmsford. Rare ; found on the Roman road. 39. Marptusa muscosa (Clerck). Epping Forest (O. P.-C.). Common. Known also as Salticus tardigra- dus, Blackwall. 40. Ballus depressus (Walckenaer). Epping Forest (F. P. S.). Known also as Salticus obscurus, Blackwall. PISAURID^: Spiders with eight eyes in three rows of 4,. 2, 2 ; the small anterior eyes being sometimes 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. 41. Pisaura mirabilis (Clerck). Broxted ; Epping Forest (O. P.-C.). Known also as Dolomedes, or Ocyale, mirabilis. 198