metathorax


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metathorax

(mĕt′ə-thôr′ăks′)
n. pl. meta·thoraxes or meta·thoraces (-thôr′ə-sēz′)
The hindmost of the three divisions of the thorax of an insect, bearing the third pair of legs and the second pair of wings.

met′a·tho·rac′ic (-thə-răs′ĭk) adj.

metathorax

the posterior of the three thoracic segments in insects, bearing the third pair of jointed legs and the hind pair of wings.
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One pair of setae on each mesothorax and metathorax segment, and a pair on abdominal segment VIII, each arising from a tubercular base along the anterior-lateral margin of the vasiform orifice.
Dorsal view: prothorax smooth, not square-shaped with two dorsolateral horn-like structures that protrude only slightly; mesothorax with four and metathorax with two tiny setae; abdominal segments with spiracles extruded slightly, abdominal segments three to seven dorsally with short medially located setae; cremaster round with four pairs of curved setae.
As pointed out by Soto-Adames (2002), the dorsal chaetotaxy of the metathorax and 1st abdominal segments in Metasinella is reduced with respect to most Lepidocyrtus and Pseudosinella (cf.
Spiracles: Located laterally in mesothorax and metathorax on papillae or tubercles, and on the first eight abdominal segments (Fig.
Mesothorax and Metathorax.- Scutellum black, quadrate, clothed with dense white hairs; elytron about twice as long as broad; striae deep, punctate, strial intervals punctulate; distance between striae at base subequal; striae 2, 3 and 4 with small denticles at their bases; humerus punctulate, glabrous, shiny black (Fig.
Metathorax + propodeum glossy, with anterior surface unsculptured; posterior surface transversely striate.
Body blackish brown; the living adults have red hypodermal pigment which combined with the blackish cuticle results in dark abdominal segments with a red band in the posterior edge; the same red bands are observed at the end of the head, the prothorax and the metathorax; in addition, in weakly sclerotized individuals the tube is reddish; brown yellowish setae; middle part of the fore tibiae and tarsi brown yellowish; lateral margin of fore tibia dark brown; antennal segments dark brown except segment III brownish yellow and pale brown distally; fore wings slightly shaded around margins and in a medial longitudinal line (Fig.
Legs: profemora about 3/4 length of mesothorax, mesofemora slightly longer than metathorax, metafemora slightly projecting over posterior margin of abdominal segment IV and metatibiae roughly reaching to abdominal segment VIII.
4I); scutellum with small round medial depression; hemelytra smooth, with row of punctures along claval suture; metathorax above scent gland evaporatory area with sensillae originating from deep round depressions (as in P.
Metathorax + propodeum shiny, with track of median longitudinal furrow, with disc and anterior surface partly smooth and partly rugose; posterior surface strongly transversely striate.
Pleura with setae like those on face, setae becoming longer and more simple ventrally (i.e., minute branches become gradually shorter and effectively disappear); metepisternum with setae like those on metathorax, with short, appressed setae concentrated along upper margin.