Manual of North American Diptera / by Samuel W. Williston.

  • Samuel Wendell Williston
Date:
1908
Catalogue details

Licence: In copyright

Credit: Manual of North American Diptera / by Samuel W. Williston. Source: Wellcome Collection.

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    TABRE OF GENERA. BY PROF. C. F. ADAMS. 1. Proboscis elongate; slender, not retractile, usually as long or longer than the dorso-ventral diameter of the head. ... 2 Proboscis shorter than the head, thick and retractile. . . 15 2. Proboscis slender and rigid, nearly or quite as long as the head and thorax together; labella small. ...... 3 Proboscis as long as or but little longer than the head. . 8 3. Scutellum and abdomen armed with spines. . Hystrisiphona. Scutelluin and abdomen with the usual macrochaetae. . . 4 4. Sides of face bare. ......... 5 Sides of face clothed with short bristles. . Prorhynchops. 5. Palpi very short, thickened at tip; macrochaetae only marginal. Prosena. Palpi moderately long, not at all or but little thickened at tip; macrochaetae usually discal and marginal. .... 6 6. Claws of male extraordinarily long. 1. . Mochlosoma. Claws of both sexes short. ....... 7 7. Facial carina broad, inflated, depressed. Facial carina narrow, not inflated, compressed. . Myiomima. Prosenoides. 8. Abdomen densely covered with macrochaetae. Abdomen with regularly arranged macrochaetae. 9 10 9. Vibrissae inserted some distance above oral margin (3, 4). Hystricodexia. Vibrissae inserted on oral margin. . . . Bathydexia. 10. Eyes descending not more than two-thirds the distance to lateral oral margin. . . . * . . . . .11 Eyes descending at least three-fourths the distance to lateral margin. . . . . . . . . . .14 11. Fourth vein with a stump at its bend (1, 2). . Scotiptera. Fourth vein without stump at its bend. ..... 12 12. Macrochaetae of abdomen discal and marginal. . . .13 Macrochaetae only marginal (12,13). . . Myiocera. 13. Face quite concave in profile; vibrissae at oral margin. Myioscotiptera. Face nearly perpendicular; vibrissae some distance above oral mar- gin (14, 15, 19.) Rhynchodexia
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