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Show 1893.] MR. E. E. AUSTEN ON NEW DIPTEROUS INSECTS. 141 femora, not reaching to the tips, and the distal third of the posterior tibiae brown; there is sometimes an indication of an incomplete brownish ring round the middle of the posterior tibiae. Wings in the d sharper at the tip, and with the terminal portion of the fourth longitudinal vein, closing first posterior cell, more oblique than in the 2 5 suffused with brown, usually lighter at the base on the inner side, darker in the costal and subcostal cells and in the middle, and with the stigma and an elongated and not sharply-defined spot at the tip, above the third vein, dark brown ; wings in the § hyaline, the subcostal cell brown, and the stigma and an elongated spot at the tip above the third vein, as in the d, dark brown ; third longitudinal vein gently curved: alulce of full size. Ceylon (Lieut-Colonel Yerbury): twelve specimens. The types are from the Hot Wells at Trincomali, the d collected on Nov. 2, 1890, and the 5 on March 13, 1892 ; very common on the Trincomali side. Other specimens from Kandy (whence also the Museum collection contains two collected by Mr. E. E. Green), Heneratagoda, and Bentota. Apparently the commonest species of Baccha in Ceylon. This species is very closely allied to Baccha apicalis, L w . (Wien. ent. Monatschr. Bd. 2, p. 106), from Japan, and may, indeed, be identical with it. Since, however, Loew describes a $ only, of which the head was destroyed, and considering the great difference in the locality of the specimens, it is impossible to be certain of the identity without comparing Loew's type, and I have therefore ventured to consider the present specimens as distinct. In the markings of the third and fourth segments of the abdomen, B. pidchrifrons resembles B. dispar, Walker (Journ. Linn. Soc. iii. [iv.] p. 121), from Macassar, Celebes. The latter species, however, is at once distinguished by its much greater size and by the brown band across the centre of the wing. Besides the specimens mentioned above, Colonel Yerbury obtained two others, which he bred from an Aphis-infested leaf of the " Cambuk" tree, found at Nilavelli on Nov. 16, 1890. The flies, which are d and 2 ? emerged on Nov. 29 and 30, 1890. The specimens are somewhat smaller than the majority of those of B.pidchrifrons (the $ measures 9| m m . in length; the head of the d is unfortunately missing), but resemble them in their general habitus, with the following differences:-the thorax of the d is more greenish black and less bronze; the yellow markings of the abdomen in both sexes are much more distinct, sharper, and more opaque-looking; those on the third and fourth segments of the •abdomen of the d are larger than in B. pidchrifrons, and the inner longitudinal stripes on the fourth segment in the $ are broader, and expanded on the hind margin of the segment; the wings, with the exception of the subcostal cell, which is brown, are hyaline in both sexes, with a very faint infuscation at the tip above the third vein; there is an indication of the metallic violet spot on each side of the base of the antenniferous process in the 2 • As these specimens are not in a good state of preservation, it is impossible |
