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n.1.(Zool.) The dorsal portion of the mesothorax of insects.
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The genus Acerentuloides is characterized by 2 pairs of A-setae on the mesonotum and metanotum; 3 setae on the 2nd and 3rd pair of abdominal legs, of which the apical median seta is minute; well developed labial palpus with terminal tuft of setae and broadened sensillum; maxillary gland with small, smooth, globular vesicle or granulated appendix on the calyx and with several small globules in distal part; some setae modified as short, thickened sensilla (sd5 on head; [beta]1 and [delta]4 on foretarsus; setae P4 on metanotum, M2 on prosternum, and A2 on thoracic sterna; and accessory setae on tergites and sternites I--VI); 6 setae on sternite VIII; anterior position of seta P3 on abdominal tergites II--VI; developed striate band with clearly visible parallel-sided striae.
1A): Slightly elongated body; triangular light browned head with broad tylus, surpassing the juga and with four dark browned spines in the apex; small yellowish-browned pale eyes; ocelli absent; paled yellow four segmented rostrum surpassing the metacoxae; antennae with four segments, number I being smaller than segments II and III, and segment number IV fusiform, all of them with light browned coloration, except IV paled yellow; pale browned thorax; pronotum larger than the mesonotum and metanotum; yellowish paled femora, tibiae, senescent glands and also the abdomen dorsally and ventrally.
Members of this genus were pale black to grey flies with the abdomen often yellow, and the mesonotum have two or four black vittae.
Mesonotum has three longitudinal keels and side keels are diverging from each other to the posterior.
Its members differ from those of other acridids by their invisible mesonotum or visible only from its posterior region (Costa & Carvalho 2007, Costa et al.
irrigatus, mention that the adults can be recognized by the frons without setae; antenna short, same length in both sexes, about 30 flagellomeres; antennal fossae separated by about width of pedicel; fore femur without clavate setae; ocular rim without setae; fore femoral sense hair as long as fore femur and mid femoral sense hair; mesonotum without blade-like setae; tibial spurs present; pretarsal claws large, longer than one-half length of distal tarsomere; pilula axillaris large; fore wing vein 2A runs in a fairly even curve toward 3A; posterior area of hind wing narrower than presectoral area, CuA bends to hind margin at or before origin of medial fork; anterior banksian line weakly developed; fore wing without dark brown stripe in mediocubital area.
Tegmina and wings represented by well-veined lateral pads: mesonotum and metanotum with a distinct medial carination.
Thorax: Prosternum large, abutting proepisternum and prothoracic coxae; dorsal (anterior) margin of prosternum with distinct flange-like projection (75); mesonotum strongly humped; postmetacoxal area membranous; anatergites asetose; pulvilli well developed; alula highly reduced (130); anal lobe and alula reduced and without bordering vein (ie.
Mesonotum with small gray marks anterolaterally, wingbuds with developing costal veins grayish.
Genus Proan Haliday comprised of aphid parasitoids having wing venation with recurrent vein developed; interradial vein effaced, notaulices distinct throughout, lateral lobes of mesonotum setose (Raychaudhuri, 1990; Kavallieratos et al.
Ormenocoris it distinguished by the elongate head with anterolaterally inserted eyes and bifurcate lateral projections on pro- and mesonotum.