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 (mĕz′ə-thôr′ăks′, mĕs′-)
n. pl. mes·o·tho·rax·es or mes·o·tho·ra·ces (-thôr′ə-sēz′)
The middle of the three divisions of the thorax of an insect, bearing the middle pair of legs and the first pair of wings.

mes′o·tho·rac′ic (-thə-răs′ĭk) adj.
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Pterothorax: Trapezoidal, lateral margins slightly divergent, posterior margin convex, forming fine lateral ends; pteronotum not divided; pteronotal postero-lateral marginal setae five to six on each side, arrangement 4,2+2,4 (4 latero-posterior and 2 posterior setae); trichoid setae present, thorn like setae present; mesothoracic spiracles ventral in position; proepimeron expanded posteriorly and separated in median; mesofurcal pit present; meso-metasternal plate elongated and narrow, with one pair of normal fine seta on each.
Full-body 3D CT scan with intrathecal radioactive polymer infusion revealed the following: (1) incomplete herniation of the brain stem probably due to low CSF pressure; (2) dilation of endothoracic cyst, with more than 20 cm diameter, fully compressing left lung causing functional left pneumonectomy; and (3) possible communication of CSF with mesothoracic cystic mass (Figures 1(a), 1(b), and 2).
Ventral tubular ducts (vtbd) present, with a slender inner ductile (terminal filament), similar in length to outer ductule, each tubular duct with a well-developed gland present on area around mesothoracic and metathoracic coxae.
Antenna brown; eyes black with a characteristic brown band in the upper half; prothoracic and mesothoracic legs brown mottled with light green in life; internal face of hind femur blackish, external upper area brown, median external area green drying black, lower inner area of hind femur and tibia slightly greenish to blueish in life.
with long antennae, 2 mesothoracic macrosetae, trochanteral organ with long flexible setae, dental spines, and lacking femoral organ; and Sulcuncus with short antennae, 1 mesothoracic macroseta, trochanteral organ with short, stiff, spine-like setae, femoral organ present, and without dental spines.
Number and distribution of prominent spiniform sensilla on pro- and metalegs as in Table III; sensillar distributions on metathoracic (Figures 2A, B) and mesothoracic legs are similar, only more numerous on former; complex sensilla, bearing unicellular processes present, more numerous ventrally and distally on femoral and tibial segments; posterior tarsal claws shorter than anterior claws.
The legs of one side of the body are maintained over the fragment, whereas the meta-and mesothoracic legs of the other side are stretched backward.
Legs brown, hind legs darker; hind femur, hind tibia with basal paler ring; hind tibial comb with 7 spines; prothoracic tarsal ratio 1.60-1.91 (1.79, n = 22); mesothoracic tarsal ratio 1.95-2.22 (2.11, n = 19); metathoracic tarsal ratio 1.82-2.75 (2.00, n = 22).
griseus grasped a larva with its pro and mesothoracic legs, subdued the struggling larva by puncturing its body with the help of the sharp rostrum, and then fed on its internal body fluid.