n.1.(Zool.) That part of the integument of an insect which surrounds the spiracles.
References in periodicals archive ?
Ventral surface: Pale brown, ostiolar peritreme creamy white, abdominal venter bearing short, recumbent, pale, simple setae, these setae longer and more numerous on lateral margins of genital cavity.
5b); peritreme heavily pigmented; asymmetrical; about 2.
Macropterous form: Thorax: Pronotum wider than long, with hispid tubercles, subquadrate, flattened, not declivous; frontal angles rounded, not projecting; humeral angles obtuse, not exposed; collar indistinctly depressed, not separated by a distinct incised line; middle third of pronotal disk with a broad longitudinal sulcus; anterolateral margins obliquely straight, roughly granulate; posterior margin concavely arcuate before base of scutellum; prosternum depressed; meso and metasternum sulcate; anterior lobe of metathoracic peritreme weakly reniform, posterior lobe subacute, raised; evaporative area short; posterior margin of metapleura with outer third obtusely rounded, and slightly raised.
A scanning electron micrograph (SEM) of a thoracic spiracle (considered here as metathoracic) on an adult female Gynaikothrips ficorum (Marchal) (Phlaeothripidae) shows a hemispherical peritreme composed of roughly-textured white and gray cuticle containing numerous, jaggedly-circular, black openings or pores (Fig.
COLORATION: Head and thorax dark yellow, mottled with pink spots, with punctures black to reddish brown; rostral segments I to III dark yellow, and IV brown; pro- and mesosternum black; anterior and posterior lobe of metathoracic peritreme pale yellow; coxae and trochanter dark brown with irregular yellow marks; fore and middle femur dark yellow and densely mottled with black marks; hind femora dark reddish-orange, scattered with black marks; abdominal sterna dark orange, mottled with pink spots, with yellow irregular spots at posterior margin of sterna III to VII; genital capsule dark orange.
The peritreme of the abdominal terga are reduced and with a central tubercle as in Mycterothrips glycines Okamoto (Miyazaki & Kudo 1989).
3B, 5A, 9D-E); ostiolar peritreme glabrous and shiny or covered with microtrichae and matte (Figs.
0 times as wide as head, with weakly defined calli, distinctly concave lateral margins, and raised basal part; pronotal collar rather long, flat, posteriorly delimited by shallow depression; metathoracic scent-gland evaporatory area broad, leaflike, extended backwards, with comparatively large, distinctly raised oval peritreme (as in P.
Spiracle I elongate, with fine peritreme and covered by wing thecae; spiracles IIIV ovate, prominent, with strongly sclerotized peritreme; spiracle V-VIII closed.
It is here transferred to the tribe Austromirini on the basis of the tumid peritreme of the metathoracic glands (Cassis, 2008; Cassis and Wall, 2010).