The entomologist's text book : an introduction to the natural history, structure, physiology and classification of insects, including the Crustacea and Arachnida . e preceding figures, all of which represent scalesfrom the goat-moth. Here it will be serviceable to notice a few of the more cha-racteristic variations which occur in the markings of thewings of lepidopterous insects (see fig. 134); these are,— 278 PTILOTA : IMAGO—EXTERNAL ANATOMY. Spots {Macules), which are patches of one colour appear-ing on the differently coloured wngs (134, a a). Dots {Atomi), which are very minute points of a
The entomologist's text book : an introduction to the natural history, structure, physiology and classification of insects, including the Crustacea and Arachnida . e preceding figures, all of which represent scalesfrom the goat-moth. Here it will be serviceable to notice a few of the more cha-racteristic variations which occur in the markings of thewings of lepidopterous insects (see fig. 134); these are,— 278 PTILOTA : IMAGO—EXTERNAL ANATOMY. Spots {Macules), which are patches of one colour appear-ing on the differently coloured wngs (134, a a). Dots {Atomi), which are very minute points of a differentcolour; when scattered over the entire sm^face of thewings they are said to be irrorate {h). Puncta, gutta, pustula, and plaga, are words used for spotsof various sizes. Lines {Linece), narrow, generally straight marks of differ-ent colour (c). Streaks {Strigce), somewhat broader lines, generally trans-verse {d). Bands {Fascia), broad transverse marks (e). Vitta is a longitudinal fascia. The four last terms are said to be undulated when alter-nately curved hke waves (/), and dentated whentoothed {g). Annulets {Annuli), ring-like marks {h). 13L. Imag;inary wing of a Butterfly. Eyelets {Ocelli), circular spots upon a differently colouredwing, with the centre also differently coloured [i); thelatter is termed the pupil {pupilla), and is sm-roimdedby the iris. Luuulets {Lunulce), crescent-shaped marks {k). MEMBRANACEOUS WINGS. 279 Adjectives derived from these words are employed in de-scribing lepidopterous and other insects. Thus we have suchwords as maculated, fasciated, ocellated, &c. In the caddice flies, the wings are clothed with fine hairs,whence the name of the order given to them by Ku-by,Triclioptera j the wings of the gnat are also beautifully or-namented with scales along the nerves of the wing. Theseorgans, in a general sense, are of an elongated triangularform, the longest side being the exterior, or anterior, mar-gin ; the opposite angle is the posterio
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Keywords: ., bookau, bookcentury1800, booksubjectcrustacea, booksubjectinsects
