. Monographs of the Diptera of North America [microform]. Diptera; Insects; Diptères; Insectes. ".. ,'' â â ' i * â â .' â ,â â ".1 *â â ;'â â ';*:-li V,.- â III. 100 DIPTFRA OF NORTH AMERICA. [PAIiT III. Myrmecomyia is not only very like Cephalia in appearance, but closely allied to it in reality. However, they may be distin- guished by the presence, in Cephalia, of a luesulhoracic bristle, and by the absence of the coarctation of the first abdominal scf^ment, peculiar to Myrmecomyia. The alulae and tegultu iu Cephalia, although small, are nut wanting; the posterior angle of the wi
. Monographs of the Diptera of North America [microform]. Diptera; Insects; Diptères; Insectes. ".. ,'' â â ' i * â â .' â ,â â ".1 *â â ;'â â ';*:-li V,.- â III. 100 DIPTFRA OF NORTH AMERICA. [PAIiT III. Myrmecomyia is not only very like Cephalia in appearance, but closely allied to it in reality. However, they may be distin- guished by the presence, in Cephalia, of a luesulhoracic bristle, and by the absence of the coarctation of the first abdominal scf^ment, peculiar to Myrmecomyia. The alulae and tegultu iu Cephalia, although small, are nut wanting; the posterior angle of the wing, although very shallow, is likewise apparent. 1»I. myrmecoides LoEw. % 9.â(Tab. VIII, f. 9.) Nigra, alarum hyalinarum iinti basi et apice extreuio uigris. Black ; wings hjaline, extreme root and apex black. Long. corp. â ; long. al. Syn. Cephalia mynwcoidcs LoEw, Wien. Eut. Monatschr. IV, p. 83. Black, glossy. Head shining black, face and cheeks usually brown. The very broad and long front, descending in a steep slope, has a very narrow middle stripe of velvet black, wliicli does not reach much beyond the middle of the front, but is con- nected by a furrow with the frontal fissure; the latter is not in the shape of an arc, but of an angle. Ocelli approximated to each other. The vertex bears two strong bristles, and on both sides of them two shorter ones; moreover, far back of the ocelli there are two small erect bristlets, while there are none in the immediate vicinity of the ocelli. The conspicuously large lateral parts of the front have irregular, wrinkle-like, transverse impres- sions, and along the orbits a very narrow border of white pollen. Antennae long and narrow, reaching to the anterior edge of the mouth; the first two joints brownish-red, the third black; ^ta with a very short pubescence. Face convex, descending obliquely in profile, but not excavated ; the anterior edge of the mouth not drawn upwards ; antcnnal fovea3 indist
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectd, booksubjectinsects
