basal joint distended into a concave, plate-like ear which envelops the rest of the structures.
Auriculo-ventricular: the outer valves of the heart between the auricular space and the chamber.
Auriculo-ventricular openings: are the lateral openings into the heart by means of which the blood is admitted into it.
Auritus: with two ear-like spots or appendages.
Auroral spot: applied to the bright orange colored spot at the apical area of Anthocharis.
Auroreous -eus: red, like the aurora borealis [crimson lake].
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.).
Axillary excision: = a. incision, q.v.
Axillary incision: Diptera; an incision on inner margin of wing, near base, which separates the alula from the main part.
Axillary lobe: the sclerite covering the base of the wing in Diptera; see also alula and posterior lobe.
Axillary vein: one or two longitudinal veins toward the inner margin from the anal vein (Ephemeridae); a group of several (10-20) radiate veins that occupy the anal field in Orthoptera.
Axis: a small process at base of elytron, upon which it turns.
Azure -eus: clear sky-blue [cobalt blue].
Azygos: unpaired; a structure without a fellow; sometimes applied to an unpaired oviduct specifically the enlarged portion of the vagina at the junction of the oviducts and thus = uterus.
B
Baccate -us: berry-like: applied to bladder-like ovaries from the surface of which the short ovarian tubes arise.
Back: the dorsum or upper surface.
Baculiform: rod or staff-like.
Badius: liver-brown; clearer and lighter than castaneus [dragon's blood].
Baenomere: a leg-bearing (thoracic) segment.
Baenopoda: the thoracic legs.
Baenosome: the thorax.
Balancers: see halteres.
Bald: without hair or other surface vestiture: see bare.
Band: a transverse marking broader than a line.
Bar: a short, straight band of equal width.
Barb: a spine armed with teeth pointing backward.
Barbate: furnished with barbs; hair with spines or spurs directed backward.
Barbated: bearded; in antennae with tufts or fascicles of hair or short bristles on each side of each joint; = brush-like: on the abdomen, with flat tufts at the sides or tip.
Barbule: a small barb, beard or filiform appendage.
Bare: without clothing of any kind: see bald.
Basad: in the direction of or toward the base.
Basal: at or pertaining to the base or point of attachment to or nearest the main body.
Basal area: in wings: that space nearest the point where they are attached to the body: on the metanotum of Hymenoptera, the anterior of the three median cells or areas = 1st median area.
Basal cell: Diptera; st (Will.), = radial 2 (Comst.); 2d (Will.), = media (Comst.); Trichoptera; one, two or three cells enclosed by the branches that form-the post-costal or anal vein: Odonata; an elongate cell between radius and cubitus, just before the arculus.
Basalis: the principal mandibular sclerite, when sclerites are distinguishable, to which all other parts are jointed; corresponds to the stipes in the maxilla.
Basal line: in many Lepidoptera; a transverse line extending half way across the primaries very close to base.
Basal lobe: of culicid genitalia, see claspette.
Basal post-costal vein: in Agrioninae, one of the cubito-anal cross-veins.
Basal segment of clasp: see side piece.
Basal space: that area on the primaries of certain Lepidoptera, between the base and t. a. line (q.v.).
Basal streak: in Noctuid moths, extends from base, through the submedian interspace to the t. a. line.
Basal transverse carina: on the metanotum of Hymenoptera, crosses before middle and separates the anterior from the median areas.
Base: that part of any appendage that is nearest the body: on the thorax that portion nearest the abdomen; on the abdomen that portion nearest the thorax.
Basement membrane: that thin layer of tissue upon which the epithelium rests.
Basilar: of or pertaining to the base.
Basilar cross-vein: Odonata; crosses the basilar space.
Basilar membrane: a thin membrane separating the cones and rods from the optic tract.
Basilar space: Odonata; that area at base of wings, between media and cubitus.
Basi-proboscis: basal third of the flexed proboscis of muscid flies.
Batesian mimicry: see mimicry.
Bathmis: see pterostigma.
Bave:
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