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SPIDERS ANYPHjENIDjE The spiders of this family resemble those of the Clubionidte in most respects, except that the tracheal stigmatic openings beneath the abdomen are situated about midway between the genital rima and the spinners, and not as in the last family immediately in front of the spinners. One species only is indigenous to Great Britain, and is very common amongst the foliage of trees in May and June. 28. Anyphtena accentuata (Walckenaer). Wimbledon. THOMISID^E 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 the chief characteristic which enable them to be dis- tinguished from the more elongate Drassidte and Clubionidte. 29. Philodromus dispar, Walckenaer. Horsley (F. P. S.). 30. Philodromus aureolus (Clerck). Horsley (F. P. S.). 31. Tibellus oblangus (Walckenaer). Horsley (F. P. S.). Common amongst dry coarse grass on sand- hills and also amongst the rich vegetation in swamps, where the species is as a rule much larger. 32. Thanatus striatus, C. L. Koch. River Wandle. Not uncommon in marshy places and swamps. 33. Ditea dorsata (Fabricius). Horsley. 34. Xysticus cristatus (Clerck). Horsley (F. P. S.). 35- Xysticus pini (Hahn). Horsley (F. P. S.). 36. Xysticus ulmi (Hahn). Wimbledon. 37. Xysticus luctuasus (Blackwall). Horsley (F. P. S.). 38. Xysticus erraticus (Blackwall). Horsley (J. Carrington). 39. Oxyptila atomaria (Panzer). Horsley (F. P. S.), Wimbledon. 40. Oxyptila trux (Blackwall). Horsley (F. P. S.). 41. Oxyptila praticola (C. L. Koch). Horsley (F. P. S.). 42. Oxyptila simplex, O. P.-Cambridge. Wimbledon Common (F. P. S.). 43. Misumena vatia (Clerck). Horsley (F. P. S.). ATTID^E The spiders of this family may be recognized in a general way by their mode of progres- sion, consisting of a series of leaps, when alarmed. 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 and usually iridescent. Otherwise these spiders are simply specialized Clubionids, with two tarsal claws and other minor characters possessed in common with members of this latter family. The commonest, Salticus scenicus, will be well known to all observers, running and leaping on the walls of houses in the bright sunshine. 44. Euophrys frontalis (Walckenaer). Horsley (F. P. S.). Abundant in most districts. 45. Heliophanus cupreus (Clerck). Horsley (F. P. S.). 46. Salticus scenicus (Clerck). Wimbledon (F. P. S.). This spider is also known as Epiblemum scemcum. 47. Marptusa muscosa (Clerck). Wimbledon (F. P. S.). One of the largest and most beautiful of our Attida, often abundant under the bark of old wooden palings, or among the loose stones of walls, such as those which cross the down- lands on the south coast. 48. Ergane falcata (Clerck). Horsley (F. P. S.). 49. Dendryphantes bastatus (Clerck). Horsley (F. P. S.). 181