KEY TO THE SPECIES OF THE ORTHETRUM NEWMAN , 1833 ( ODONATA , LIBELLULIDAE ) WITH A NEW RECORD SPECIES IN IRAQ

This paper provides an identification key to the species of Orthetrum Newman, 1833 (Odonata, Libellulidae), including six species that were collected from different localities in Iraq. The species of O. anceps (Schneider, 1845) is registered as a new record in Iraq; the most important characters which are used in diagnostic key are included.


INTRODUCTION
The dragonfly insects belonging to the Odonata, are abundant and of worldwide distribution (Corbet, 1980); the genus of Orthetrum Newman, 1833 under the guild of Anisoptera in Libellulidae family, is the biggest one of dragonfly world-wide (Manwar et al., 2012), and this genus is a very large one, spread across the old world (Watson et al., 1991).
There are no detailed studies of this genus in Iraq, but there are found on other genera of the same family, for example: Abd andAl-Asady (2012, 2014), Abd (2013), Ali and Khidhir (2015).From the other hand, Augul et al. (2016) were re-description of O. chrysostigma (Burmeister, 1839) and referred to it as a new record from Iraq, although previously is none DOI: http://dx.doi.org/10.26842/binhm.7.2018.15.1.0015specifically mentioned by Askew (1988); therefore, this paper was conducted to design a key to species under the genus of Orthetrum in Iraq.

Specimens collection and identification
A lot of specimens belonging to Orthetrum species (Odonata, Libellulidae) were collected from several Provinces of Iraq by using air net during 2017.The specimens were killed by freezing for few hours, and mounting by insect pins.The date and localities of collecting samples were recorded.
The members of genus Orthetrum were diagnosed by using different taxonomic keys such as: Fraser (1936), Dumont (1991), Kalkman (2006) and Degabriele (2013).The specimens were capturing photo by the Dino-light microscope used with scale of measurements; in addition, some plates were taken with a Samsung galaxy S4, GT-19500 and used binocular dissecting microscope (MB.MARIOBROMA.SRL, Roma) to magnificent the morphological features.
The collecting materials were compared with spacemen's stored at the Iraq Natural History Research Center and Museum, University of Baghdad.The newly collected species were deposited in the insect collection of the Department of Entomology and Invertebrates at Iraq Natural History Research Center and Museum, University of Baghdad.

Abbreviations
Following the abbreviations of the diagnostic features that used in the present key:

Note:
The male genitalia of this species compared and agreed with (Klingenberg and Martens, 1996).