S. Mahunka szerk.: Folia Entomologica Hungarica 52. (Budapest, 1992)

A new Heterodispus species from Egypt (Acari: Heterostigmata) By S. Mahunka and A M. Zaki (Received August 1, 1991) A new Heterodispus species from Eg\>pt (Acari: Hetcrostigmata). - A new mite species (Heterodispus retropes sp. n.) is described from soil samples taken in Egypt. We describe hereunder a new Heterodispus species, which was extracted from soil samples taken under Cantaloupe sp. plant. Heterodispus retropes sp. n. Measurements. - Length: 165-178 jjjn, width: 126-142 p.m. Dorsal side (Fig. 1): Habitus is rather similar to the other species beonnging to this genus, clypeus wider than the other segment and the body gradually narrowing towards P-segment. Among the dorsal setae a very great difference exists. Both pairs of clypeal (ci, ci) setae, and the setae of Z)-segment thin, setiform, rarely pilose. The latter slightly longer than the preceding ones. Setae of E, F and //-segment strongly thickened, distinctly spiculate. Setae of P-segment short, both inner pairs slightly dilate, with long cilia. Ventral side (Fig. 3): Anterior sternal plate much narrower than the posterior one. Apodemes on the anterior part well, on the posterior part partly poorly developed, ap. sp. strong, but ap. 4 and ap. 5 weak and short. Anterior margin of posterior sternal plate concave, its anterolateral part well dilate, protruding laterally (Fig. 4). Among the epimeral setae also great variability observable. Setae la, 2b, 3c and 4c strong, thick, mostly blunt at tip and with trong spines on their surface. Other setae simple, setiform, less or more strongly ciliate. Setae 3a and 3b originating nearly in a transversal line, setae 4b standing behind leg IV and setae 4a originating far posteriorly, but either very short, or absent and represented only by their alveoli. Posterior margin of sternal plate longitudinally striated. Legs: Claw of leg I completely reduced, otherwise chaetotaxy is normal. A well developed double basal tubercle of seta tc" and p' is observable (Fig. 6). Legs II (Fig. 5) and III normally developed, tarsus of leg IV strongly reduced, without ambulacrum (Fig. 2). Femur of leg PV with a great, basally dilated lobe. Under it a wide plate with a hollow also observable.