| OCR Text |
Show 156 ME. E. E. AUSTEN ON NEW DIPTEEOUS INSECTS. [Jan. 17, the pleura? are shining metallic; above the middle coxa? a faint brownish opalescent stripe extends upwards and backwards to the metanotum, which is dark metallic. Scutellum wholly sattron-yellow. Abdomen flat, broad, not contracted at the base, but expanding regularly to the end of the fourth segment; like the thorax, it is almost bare ; first segment pale yellow, with a tuft of yellow hairs on each side; second segment with rather more than the basal third brown, narrowly yellowish at the extreme base, and with a shining reddish-brown band on the h m d margin, in front of which is a narrow dark brown transverse band, which is slightly concave posteriorly; the yellow area of the segment therefore takes the shape of a fairly broad transverse band ; the brown basal area is sometimes fainter, and the segment then appears yellowish at the base also; third segment shining reddish brown on the posterior margin, m front of which is a narrow transverse brown band, which projects on each side into a small angle at about a fifth of the width of the segment from the lateral margin ; from the auterior margin a brown spot shaped like a spear-head projects backwards in the median line, and is narrowly connected by an almost obsolete median stripe with the posterior transverse band ; from the anterior third of the lateral margin a tongue-shaped brown mark projects imvards on each side, leaving the actual anterior margin of the segment yellow ; on the fourth segment the markings are a modified representation of those on the third; there is a narrow shining brown posterior border, which expands into a dull brown quadrate area on each side, from which a greatly prolonged acute angle projects forwards and slightly inwards, extending to within one-fourth of the length of the segment frem the anterior margin; the median line is occupied by a fairly broad and sharply defined stripe, which expands at each end, but the tongue-shaped mark which is seen projecting inwards on each side of the preceding segment in front is here much reduced and sometimes almost obsolete; the width of the yellow marks on this segment varies in different specimens, and in' the typical individual those on either side of the median stripe extend to the hind margin ; the markings on the fifth segment are arrived at by a still further modification of the foregoing ; in this case the brown marks take the form of a median stripe, expanded towards each end, and of a curving piece projecting forwards from each posterior angle and nearly reaching to the anterior margin; the lateral margins of the segment are also narrowly brown; the sixth segment, which is very small, is brownish on each side, and has a narrow median stripe extending almost to the hind margin; the brown marks are, however, not visible in the typical specimen. Third longitudinal vein of the wings straight, curving downwards at the tip. Brazil, region of the Amazons (Bates) : two specimens. In addition to the above, there is also in the collection a small male, which I regard as belonging to this species ; it is, however, too much damaged to describe, and I have therefore made a fem ale |
