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Condizione: New. 102, col photos, line drawings. 220x160mm. PB. NEW. . Bees belonging to the genus Trachusa are relatively large, robust species. Females are important pollinators which have a specialised pollen-carrying structure on the underside of the abdomen. Trachusa bees are solitary although usually construct their nests in aggregations. For those species whose breeding biology is known,nest cells are made from resin and pieces of green leaves. Trachusa has a world-wide distribution. This publication is the first comprehensive overview and guide to the 25 species found in Europe, Africa and Asia. It provides descriptions of all species and gives separate identification keys to females and males. All species are illustrated, with altogether 205 colour micro photographs and over 50 line drawings showing morphological details. The species accounts are further supported ny distribution maps and graphs depicting seasonal occurences. This publication hereby summarises our knowledge and attempts to stimulate further research in the taxonomy, biology and ecology of this still little-known group of insects.

The pteromalids (Hymenoptera: Chalcidoidea: Pteromalidae) are small parasitic wasps feeding as larvae on the immature stages of other species of insects (mainly) and spiders (rarely) and also many of them are phytophagous. These are one of the numerous and economically important groups of parasitoids regulating the abundance of many insects, including xylophagous ones. The family is distributed in all biogeographical areas of the wolr and shows great diversity in morphology and biology. It contains more than 600 valid genera and more than 3500 valid species. Species diversity of Pteromalidae in Iran is studied in this paper. In total, 227 species from 114 genera and 16 subfamilies are listed. Ansfelden. 101 pp., 4 figs, br. 8 [15.5 x 22 cm].