OCR Text |
Show 152 ME. E. E. AUSTEN ON NEW DIPTEEOUS INSECTS. [Jan. 17, tapering somewhat towards the sides and narrowly divided in the median line ; in the median line the band is about three tnnes_ as far from the posterior margin of the segment as from the anterior, and it may appear not quite to reach the lateral margins ; on the fourth segment the ochraceous markings take the shape of a somewhat lunate mark projecting backwards from the anterior margin on each side of the median line, with a narrow piece projecting obliquely from the base of each mark towards the lateral margin on each side ; the inner margin of the " lunate " marks is convex, they extend about two-thirds the length of the segment, and are obliquely truncated anteriorly and posteriorly; the extreme base of the segment is narrowly ochraceous from each " lunate " mark to the side; on the fifth segment the ochraceous marks are represented by a stripe on each side of the median line, starting from the anterior and reaching to the posterior margin, with the inner side of each slanting outwards posteriorly, so that the groundcolour between them constitutes a small triangle, which is continued as a narrow- median stripe to the anterior margin ; the ends of the two ochraceous stripes are connected by a narrow and indistinctly defined band near the posterior margin ; in addition to this there is a small ochraceous triangle projecting from the anterior margin of the segment on each side, between the stripe and lateral margin, with its base connected with the stripe and its apex situated at rather more than one-third of tbe length of the segment; sixth segment with the median two-fourths of its hinder margin occupied by a yellowish band, each end of which is connected with the anterior margin by a short ochraceous stripe. The lateral prominences of the first abdominal segment bear a tuft of ochraceous pile, mingled with blackish pile posteriorly; the remaining segments are sparsely clothed with very short black pile, which becomes somewhat longer on the sides, especially in the case of the fifth segment. Brazil, Santarem (Bates): one specimen. There are also two males in the collection which I consider to belong to this species; but since they are in poor condition, I have described the $ at greater length. d. Length 12| m m . Resembling the 2 > biit differing as follows :-the most striking difference is presented by the coloration of the wings; these are uniformly suffused with pale brown, which, though stronger in the costal and darkest in the subcostal cell, shows only the very faintest trace of concentration at the tip of the submarginal cell (none at all in the second specimen in the collection, in which the tint of the wings is considerably lighter); the icings, therefore, do not present a blotched appearance; the wings are also considerably narrower, the second longitudinal vein is straighter, and the terminal portion of the fourth vein, closing the first posterior cell, much more oblique : the dark stripe on the thorax, on each side of the narrow median cinereous one, is broader : the abdomen is browner, the markings yellower; second segment yellower at the |