PROC. ENTOMOL. SOC. WASH. 79(3), pp. 281-283 HEBETULA, A NEW GENUS OF THE PREDACEOUS MIDGE TRIBE SPHAEROMIINI (DIPTERA: CERATOPOGONIDAE) Willis W. Wirth and Margaret L. Debenham Abstract. — Hebetula, new genus (type-species: Mixohelea lemur Deben-ham), is proposed for some Australasian and Ethiopian predaceous midges previously placed in Mixohelea Kieffer because of a nomenclatural pro-cedure in which Mixohelea had been synonymized with Xenohelca Kieffer. A check list is presented for the 19 species of Hebetula. In her recent revision of the Australian and New Guinean Ceratopogonidae of the tribes Heteromyiini and Sphaeromiini ( Debenham, 1974 ) , the junior author made the following statement (p. 18): "I have followed \\'irth and Ratanaworabhan (personal communication) in assigning the Austrahan Region species formerly placed in Xenohelea to the genus Mixohelea. Mixohelea was placed in synonymy with Xenohelea by Macfie ( 1940 ) , but Wirth and Ratanaworabhan have confirmed that the two are distinct, and the name Xenohelea should be applied only to those species with the thorax pollinose, and the fourth tarsomere cylindrical, and the batonnets of the fifth tarsomere scattered along its length." This separation of Mixohelea and Xenohelea was published by Wirth, Ratana-worabhan and Blanton (1974, p. 610) in couplet 46 of their key to the genera of Ceratopogonidae. When Kieffer erected the genus Mixohelea (1917b), he assigned to it five species, without designating a type-species: Palpomyia polysticta Kieffer, P. pulchripes Kieffer, and P. roseiventris Kieffer from India, Sphae-romias hexacantha Kieffer from the Seychelles, and M. australiensis nom. nov. (for Palpomyia imparunguis Kieffer non Becker) from New Guinea. The first three of these species, according to Kieffer's descriptions, belong in Xenohelea, as based on the type-species, X. priiinosa Kieffer (by orig-inal designation), and as characterized by Wirth, Ratanaworabhan and Blanton (1974) in their key. The remaining two species, hexacantha and australiensis, key out to Mixohelea Kieffer. However Wirth (1973) had previously selected as the type-species of Mixohelea one of the three Indian species, pulchripes (Kieffer), thereby sinking Mixohelea again into synonymy with Xenohelea. \\'hcn he dis-covered the unfortunate results of this action, that \'olume of the Catalog of the Diptera of the Oriental Region was already in the press, and the action could not conveniently be changed. Now it is necessary to pro-vide a new generic name for hexacantha (K.), australiensis (K.), and the other Australian and New Guinean species placed by Debenham ( 1974) in Mixohelea. For these species we propose the name Hebetula (Latin
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