Austral: is that faunal region which covers the whole of the United States and Mexico except the boreal mountains and tropical lowlands: divided into transition, upper, lower and gulf strip: see boreal and tropical.
Austroriparian faunal area: that part of lower austral zone covering the greater part of the South Atlantic and Gulf States. Begins near mouth of Chesapeake Bay, covers half or more of Virginia, North and South Carolina, Georgia, Florida, Alabama, all of Mississippi and Louisiana, east Texas, nearly all of Indian Territory, more than half of Arkansas and parts of Oklahoma, s. e. Kansas, so. Missouri, so. Illinois, s. w. corner of Indiana and bottom lands of Kentucky and Tennessee.
Autotype: any specimen identified by the describer as an illustration of his species and compared with the type or co-type.
Auxiliary: additional, or supplementing.
Auxiliary vein: in Diptera (Will.), = subcosta (Comst.).
Axillae: two small, subtriangular sclerites at the lateral basal angles of the meso-scutellum in Proctytripidae.
Axillary: placed in the crotch or angle of origin of two bodies; arising from the angle of ramification.
Axillary area: see anal area.
Axillary calli: see calli axillary.
Axillary cell: in Diptera (Will.), = 2d anal (Comst.).