. Monographs of the Diptera of North America [microform]. Diptera; Insects; Diptères; Insectes. i ORTALt')i«:âSYSTEMATIC DISTRIBUTION. 51 Body rather robust, the bristles upon the vertex, upon the posterior part of the thorax and upon the seutelium long. AntenniB of medium length; tiie anterior corner of the third i^oint acute; arista feathery. Face excavated above, and with a projecting bump below. Oral opening broader than long; proboscis very stout. Wings rather broad; longitudinal veins diverging; the first, third, and fifth besot with bristles; postcrio'- angle of the anal cell not acut
. Monographs of the Diptera of North America [microform]. Diptera; Insects; Diptères; Insectes. i ORTALt')i«:âSYSTEMATIC DISTRIBUTION. 51 Body rather robust, the bristles upon the vertex, upon the posterior part of the thorax and upon the seutelium long. AntenniB of medium length; tiie anterior corner of the third i^oint acute; arista feathery. Face excavated above, and with a projecting bump below. Oral opening broader than long; proboscis very stout. Wings rather broad; longitudinal veins diverging; the first, third, and fifth besot with bristles; postcrio'- angle of the anal cell not acute; the picture of the wings is not unlike that pre- vailing in the genus Aciura. Rather closely related to Piara is the genus Trapiiera, which I propose to establish with Ortalis chabjbea "Wied. for its type. It also stands very near the Platystomina and may easily be con- sidered as one of them, as the mcsothoracic bristle is but very little conspicuous and the fifth segment of the female abdt men is also very mnch abbreviated. The principal differences between Traphera and Piara lie in the structure of the head and of the wings. The head of Traphera is not unlike that of Platystoma, but the lower part of the occiput is but very little turgid; the vertical diameter of the eyes is very long, the horizontal, on the contrary, very short; the first two anteiinal joints are short; the third jointedoval; the arista feathery; the face is descending obliquely, excavated under the antennae, convex below; the clypeus is very much developed, its vertical diameter rather large, the horizontal one small; proboscis very much incrassated. Thorax stout and convex: its dorsum is provided with bristles 0 ily on the sides and posteriorly. Scutellum generally with ei^ht bristles. Wings comparatively short and broad, with b istly hairs on their anterior margin; the whole of the first h igitudinal vein is strongly bristly and shows, in the vicinity of the somewhat obliterate end of the au
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectd, booksubjectinsects
