I would like to thank A. Oliva, L. Diez, M. Lee Goff, J. Lucientes, J. I. López-Colón, T. Yélamos, J. Blasco Zumeta and A. Melic for assistance and encourage to do the investigation.

I would also like to thank the following experts for assistance in identification of specimens :

COLEOPTERA ORDER:

-Cholevidae y Colonidae Families: M. Blas belonging to the Department of Animal Biology (University of Barcelona).

-Cleridae Family: P. Bahillo from la Puebla de Baracaldo.

-Silphidae Family : J. P. Valcarcel from Coruña.

-Dermestidae Family : M. Geisthardt from the Museum Wiesbaden (Wiesbaden, Alemania).

-Nitidulidae Family: J. C. O. Gonzalez belonging to the Dept. of Biology (University of Santiago de Compostela, Coruña).

-T. Yélamos from Barcelona who identified Histeridae specimens.

-Staphylinidae Family: R. Outerelo from the Department of Animal Biology I, Faculty of Biology. (Universidad Complutense of Madrid).

-Anthicidae and Hydrophilidae families: C. Hernado from the Museum of Zoology (Barcelona).

-Carabidae, Elateridae y Phalacridae families: J. Vives Duran from Tarrasa (d.e.p.).

-Chrysomelidae Family: E. Petitpierre from the Department of Environmental Biology, University of Islas Baleares. (Palma de Mallorca).

-Harpalidae, Scarabaeidae, Tenebrionidae families: J. I. Lopéz-Colón from Rivas-Vaciamadrid (Madrid).

DIPTERA ORDER to thank C. M. Loarte, belonging to the Department of Evolutionary Ecology, National Museum of Natural Sciences C.S.I.C. in Madrid. A. I. Alonso from Entomology Section, Department of Environmental Sciences and Natural Resources, University of Alicante, (San Vicente de Raspeig, Alicante) for assistance in identification of specimens of Calliphoridae Family.

-Asilidae, Bibionidae, Camillidae, Carnidae, Ceratopogonidae, Chloropidae, Dolichopodidae, Heleomyzidae, Hybotidae, Opomyzidae, Piophilidae, Sepsidae, Simulidae, Sphaeroceridae, Tabanidae, Therevidae, Ulidiidae families: M. Carles–Tolrá (Barcelona).

-Calliphoridae, Fannidae y Muscidae : K. Rognes, (Stavanger, Noruega) and A. Grossmann (Nürtingen, Alemania).

-Drosophilidae Family: G. Bächli, Zoologisches Museum, Universität Zürich-Irchel, (Zürich, Suiza) - Scatopsidae Family: J.P. Haenni from the Museé d’Histoire Naturelle. (Neuchátet, Suiza).

-Anthomyiidae Family: M. Ackland from the Museum of Natural History ,Oxford (Reino Unido).

-Chironomidae Family: F. Cobo from the University of Santiago de Compostela (Coruña).

-Sarcophagidae Family: T. Pape from the Museum of Natural History. (Sweden).

-Scathophagidae Family: M. Nelson Edimburgh (Reino Unido).

-Sciaridae y Cecidomyiidae families: F. Menzel. Deutsches Entomologisches Institut. Eberswalde. (Alemania).

HYMENOPTERA ORDER:

-FormicidaeFamily: X. Espadaler from the Universitat Autònoma of Barcelona (Bellaterra, Barcelona).

-D. Askew (Tarporley, Reino Unido), for his invaluable assistance in identification of some families and species belonging to Apidae/Halictidae, Bethylidae, Braconidae, Pteromalidae, Chrysididae, Cynipoidea: Figitidae, Megaspilidae, Proctotrupoidea, Plastygasteridae y Sphecidae.

-Braconidae Family: J. V. Falcó from the Department of Environmental Sciences and Natural Resources (University of Alicante).

-Ichneumonidae Family: J. Selfa from the Department of Animal Biology (Universitat of Valencia). - -Cynipoidea (Figitidae ): J. Pujade-Villar from the Department of Animal Biology (Universitat de Barcelona).

-Proctotrupoidea (Diapriidae, Diapriinae: and D. Ventura from the former Department.

- Genus Figites (Cynipoidea: Figitidae: J. L. Nieves Aldrey. Dept. of Biodiversity and Evolutive Biology of the National Museum of Sciences, C.S.I.C. Madrid .

-G. E. King from Zaragoza for the identification of the specimen belonging to Lepidoptera Order . Parasitoids and Acari Orders: V. Iraola Campo from Zaragoza.

-Siphonaptera Order: J. Lucientes Curdi from the Department of Animal Pathology. Faculty of Veterinary. University of Zaragoza.