الفهرس 
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Abstract
The adult arbasid tick Ornithodoros (Alectorobius ) ~esebecki is kno~TI to attack and feed on the Blue(or asked) Booby, in Hasikiya Islw1d ( South Yenen Republic) in the Arabian Sea. The larval and nymphal instars of this species are k..’l1ovm to be a vi.rus-infected parasite of birds and petroleum industry employees of the Arabian Gulf.
The anato~y, histology and Listoc!le:nistry of the adult O. muesebecki genital organs were studied during the
present investigation. The following results were revealed ~d discussed ~ith siIT~lar investigations on other ticks.
The female genital system corr.prises sinGle ovary, paired oviduct, bilobed uterus, vagina, pair of accessory gland s and Gene f s 0 rgan.
A. Ovary :
1- The anatomical features of the ovary, before ~’l1d after feeding, as well as, during oviposition period, were ntudied. It was observed that oocy”es of veri-
able sizes protruded onto the ovarian surface except for a narrow anterior zone vh1ich was suggested to be a sterile zone.
2- The histology of the ovary and growing oocytes, and the nechanism of fertilization and yolk deposition were described.
J- The chemical components in each developmental sta~e of the oocyte were detected. Also, it was able to observe some Feulgen positive Granules in the cytooplas~ of some oocytes vjlich were sUGgested to be the satie virus detected in the young staLes of O. muesebecl:i. 1’hus, there ,:-~i.sht be transov2.rial t=e.ns::ri.ssion of the virus throuGh the e.dul t feI:1ales to their progeny in addition to the transstadial trans;:lission throu£h the Yo1.mg stages.
1- Each oviduct contains a prominent sac-like structure, or a’-lipulla, in which some sper~ls are phagocytised.
3- The cheLucal nature of the oviducal secretion in the distal and ampullar portions were detected, while the proximal one showed no secretory activity.