Archive image from page 85 of Diptera from the Philippine Islands Diptera from the Philippine Islands dipterafromphili00oste Year: 1882 230 C R. Osten Sacken: Diptera surroxinding, but not covering, the posterior crossvein and an angular, large spot in the discal and third posterior cells; the root of the wing and a segment of the apex are likewise yellow; the only white mark is a circular small spot in the first posterior cell, within the sinus of V Trypeta Alkestis. the third vein; the apex of the yellow triangle above the anterior cross- vein and a narrow streak across the second basal
Archive image from page 85 of Diptera from the Philippine Islands Diptera from the Philippine Islands dipterafromphili00oste Year: 1882 230 C R. Osten Sacken: Diptera surroxinding, but not covering, the posterior crossvein and an angular, large spot in the discal and third posterior cells; the root of the wing and a segment of the apex are likewise yellow; the only white mark is a circular small spot in the first posterior cell, within the sinus of V Trypeta Alkestis. the third vein; the apex of the yellow triangle above the anterior cross- vein and a narrow streak across the second basal cell are also white. Third antennal joint slightly excised anteriorly, rounded at the tip, which does not reach the peristoma; arista rather densely plumose. The chaetotaxy is the normal one of Trypeta (as far as it is preserved on the specimen); thoracic bristles rather long; two praescutellar pairs and two scutellar; but between the latter, a very minute third pair; the praesutural bristle is present; I perceive but one lower fronto-orbital; but the head of the specimen is damaged. Length 8—9 mm. — A single male. NB. I. The course of the first vein in T. Alkestis is peculiar: after joining the costa, it seems to continue alongside of it, thus pro- ducing the appearance of a flattened thickening of the costal vein between the tip of the first vein and the apex. This thickening gives an unusual breadth to the apical half of the wing; it is possible that it characterizes the male sex only. Something similar, although in a lesser degree takes place in T. Manto. NB. II. T. Alkestis, in the distribution of the spots on the wings, the venation, the structure of the antennae etc. has a good deal in common with Themara ampla Walk. J. Pr. Lin. Soc. I, 33, Tab. 1, f. 5, and may belong to the same generic group, whether this group be called Themara or Acanthoneura. It must be borne in mind that the specimen which Mr. Walker describes here as a male, he declares 1. c. p. 124 to be a
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