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Show 142 MR. E. E. AUSTEN ON NEW DIPTEROUS INSECTS. [Jan. 17, to decide whether they really belong to a new species; I therefore regard them provisionally as a variety of B. pulchrifrons. BACCHA EALLAX, sp. n. (Plate IV. fig. 12, d-) d. Length 11 mm.; wing, length 8J m m , width across the centre 2f m m . Very closely resembling B. pulchrifrons ; differing as follows -.-front, and broad median facial stripe reaching to the oral margin, metallic black, not steely; sides of the face, including upper portion, and cheeks deep yellow; antenniferous process considerably smaller, when viewed from above, and no trace of metallic violet spot on the side ; thorax and scutellum more bronzed; pleural stripe orange, much more conspicuous, and rising higher on the sides of the dorsum; first segment of the abdomen pure yellow; second segment considerably narrower, longer, and wholly bronze-black, except the basal angles, which are yellow; the yellow markings on the third and fourth segments entirely resembling those on the corresponding segments in the 2 °f &• pulchrifrons, and not as in the d of that species; wings longer and narrower; except at the base, uniformly suffused with brown, not darker in the middle; apical spot above the third vein reduced to a mere line, so as to appear as a simple continuation of the stigma: alulas long and rather narrow, with a straight posterior edge. Ceylon (Lieut.-Colonel Yerbury) : two specimens, both males. The type was collected at Haycock Hill, near Galle, April 27, 1892 ; the second individual at Kandy, M a y 30, 1892. Owing to the deceptive similarity between the markings on the abdomen of this species and those on the abdomen of B. pulchrifrons 2} these specimens would certainly be regarded as males of the latter if regard were not paid to the differences enumerated above. BACCHA AMPHITHOE, Walker, List. Dipt. iii. 549. (Plate IV. fig. 2, 2 •) Walker's type is from the " East Indies," i. e. Mulmein, according to the Museum register, coll. Archdeacon Clerk. The Museum collection also contains another specimen from Sarawak, collected by Wallace (Walker, Journ. Linn. Soc. i. 125). Walker's type, however, is a mere fragment, the sex of which it is impossible to determine, and was minus its head when Walker described it. I therefore avail myself of the opportunity presented by the acquisition of three specimens from Ceylon, contained in a collection of Diptera recently brought home by Lieut.-Colonel Yerbury, to re-describe this species. The specimens from which this re-description is drawn will be marked and placed in the Museum collection. d 2 • Length : d 10 mm., 2 10 to 11 m m . Face and cheeks yellow. A sharply-defined black median stripe on the face, from antennae to mouth, becoming somewhat indistinct before reaching the mouth in the $ ; sometimes with a metallic bluish sheen. A low facial tubercle. Front metallic black in both sexes, and yellow |
