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The collection of Culicoides (Diptera, Ceratopogonidae) in the British Museum (Natu­ ral History) contains a number of species collected and described by Austen in 1921 and by Khalaf in 1957 and 1961. These specimens were examined and additional data, particu­ larly of antennal sensilla and ratios, were presented. C. vitreipennis Austen, female holotype, has sensilla on segments 3 and 10 to 14; segment 15 crumpled. The antennal ratio is 0.97. The holotype female of C. puripennis Austen has sensilla on antennal segments 3,11 and 12; segments 13 to 15 are missing. The estimated antennal ratio is 0.96. In C. tentorius Austen the antennal ratio of female paratypes was 1.15 to 1.21, with sensilla present on segments 3,11 to 14 and also 3,11 to 15. C. odiatus Austen has antennal sensilla on segments 3 to 14 of the female holotype, and the antennal ratio is 1.17. From the evi­ dence of the sensilla and from the shape of the sensory pit on the palp, it is suggested that this species is synonymous with C. lailae Khalaf. Female midges from Cyprus identical in all respects to odiatus save that the antennal ratio is lower (1.05) have males identical to the holotype male of lailae. The ventral root of the basistyle in the terminalia of the male holotype of C. mosulensis Khalaf is stout and simple, not foot shaped as figured by Khalaf ; the antennal ratio of the female allotype is 0.99. It is suggested that this species is syno­ nymous with C. citrinellus Kieffer. In the female allotype of C. micromaculithorax Khalaf the antennal ratio is 0.87 and sensilla are present on segments 3 and 7 to 10. This bears out Kremer’s suggestion that this species and C. saevus Kieffer are synonymous. In the female allotype of C. similis baghdadensis, the antennal ratio is 1.43 and sensilla are present on segments 3,5, and 7 to 11. In this specimen the head was missing from the slide (one antenna was present) but Miss Navai (personal communication) informs me that the eyes in specimens of this species in the Smithsonian Museum collection in Washington are sepa­ rated, and not contiguous as stated by Khalaf. It is therefore suggested that C. coluzzii Callot, Kremer and Bailly-Choumara and C. similis baghdadensis Khalaf are synonymous, and that this species should be known as C. baghdadensis Khalaf. Four specimens in the collec­ tion labelled C. pictipennis by Khalaf are all C. cataneii Clastrier. A female of C. indistinctus Khalaf has an antennal ratio of 1.05, with sensilla present on segments 3 to 14.

Notes on some Culicoides collected by Austen and Khalaf