Spring aspect of the pterygot insect of Mutki (Bitlis Province, South East Turkey). Cesa News 58: 1-78, 150 figures, 1 graph. In this paper, faunistical, ecological, biological and ethological notes on the spring insects of Mutki (Bitlis Province, South East Turkey) are given. Some pterygot species recorded by the authors in Mutki district are mentioned. Totally 76 species (except Lepidoptera) are listed with their synonyms. Most of them are illustrated under natural conditions. For this purpose 150 original photographes are used. Many species are recorded newly for the fauna of Bitlis Province. Several species are given as new to the fauna of Turkey. Total species of pterygot fauna of Bitlis Province increased to 954. The Lepidoptera species recorded in Mutki are usually excluded for the purpose of a separate publication. However, some bionomical information and early stages of the lepidopteran species are mentioned and illustrated. In the present paper, recorded 111 pterygot families in the district Mutki are as follows: Ephemeroptera: Ecdyonuridae, Heptagleniidae, Palingeniidae; Plecoptera: one family; Odonata: Aeshnidae, Coenagrionidae, Gomphidae, Libellulidae; Orthoptera: Acrididae, Pamphagidae, Tetrigidae, Tettigoniidae, Tridactylidae; Dermaptera: Forficulidae; Hemiptera: Alydidae, Coreidae, Gerridae, Hydrometridae, Lygaeidae, Miridae, Pentatomidae, Reduviidae, Rhopalidae, Saldidae, Scutellariidae; Homoptera: Aphidae, Cercopidae, Cicadellidae, Membracidae; Planipennia: Ascalaphidae, Chrysopidae, Myrmeleonidae, Raphidiidae; Trichoptera: three families; Lepidoptera: Adelidae, Arctiidae, Argynnidae, Ethmiidae, Gelechiidae, Geometridae, Gracilariidae, Hesperiidae, Lasiocampidae, Lycaenidae, Lymantriidae, Noctuidae, Oecophoridae, Papilionidae, Pieridae, Plutellidae, Psychidae, Pterophoridae, Pyralidae, Satyridae, Sphingidae, Tortricidae, Zygaenidae; Diptera: Anthomyiidae, Asilidae, Bibionidae, Bombyliidae, Calliphoridae, Cecidomyiidae, Conopidae, Empidae, Limoniidae, Micropezidae, Muscidae, Opomyzidae, Rhagionidae, Sciaridae, Sciomyzidae, Syrphidae, Tabanidae, Tachinidae, Tephritidae, Tipulidae; Hymenoptera: Argidae, Apidae, Braconidae, Cynipidae, Eulophidae, Eumenidae, Formicidae, Ichneumonidae, Pompilidae, Pteromalidae, Scoliidae, Tenthredinidae, Vespidae; Coleoptera: Attelabidae, Buprestidae, Cantharidae, Cerambycidae, Chrysomelidae, Cicindelidae, Cleridae, Coccinellidae, Curculionidae, Dasytidae, Dermestidae, Elateridae, Glaphyridae, Meloidae, Melyridae, Mordellidae, Scarabaeidae, Staphylinidae, Tenebrionidae.