The mesothorax and metathorax are rather intimately fused together.
The number of spiracles is greatly reduced; in the adult a pair is present on the mesothorax, sometimes also a pair on the metathorax, and there is always a pair on the first and another pair on the eighth abdominal segment.
readily movable on the mesothorax, an arrangement usual among insects with the power of rapid running.
The males are very small, free-flying insects with the prothorax, mesothorax and elytra greatly reduced, the latter appearing as little, twisted strips, while the metathorax is relatively large, with its wings broad and capable of longitudinal folding.
readily movable on the segment (mesothorax) immediately behind - smaller and of less importance where the prothorax is fixed to the mesothorax, as in bees and flies.
3, e, f, g, h), the scutellum of the mesothorax being often especially conspicuous.
Mesothorax: III, Lateral view.
Two pairs of wings are present in the vast majority of insects, borne respectively on the mesothorax and metathorax.
3, t - on the mesothorax at the base of the fore-wings.
Prothorax small, intimately united to mesothorax.
Prothorax small, and united to mesothorax.
In the thorax the pronotum and prosternum are closely associated with the mesothorax, but the pleura of the prothorax are usually shifted far forwards, so that the forelegs are inserted just behind the head.
The Siricidae (" wood-wasps ") are large elongate insects also with one spine on each fore-shin, but with the pronotum closely joined to the mesothorax.
The Embiidae are feeble, somewhat soft-skinned insects with the prothorax small and the mesothorax and metathorax elongate.
A remarkable feature is the frequent concrescence of mesothorax and metathorax and in some cases, even, their fusion with the anterior abdominal segments.
The prothorax is short and the mesothorax very long, the three pairs of legs closely similar, the wings often highly modified or absent, and the cerci short and unjointed.
The tergal regions of the mesothorax and of the metathorax are hidden under the pronotum and the elytra when the latter are closed, except that the mesothoracic scutellum is of ten visible - a small triangular or semicircular plate between the bases of the elytra (fig.
Among the longhorn beetles, the prothorax scrapes over a median file on the mid-dorsal aspect of the mesothorax.
The three segments which make up the thorax or foretrunk are known as the prothorax, mesothorax and metathorax (see fig.
The dorsal area of the mesothorax, and also of the metathorax, may be made up of a series of sclerites arranged one behind the other - prescutum, scutum, scutellum and post-scutellum (fig.
The prothorax is much narrowed, whereas the other segments (especially the mesothorax) are greatly enlarged; the legs long and slender, the anterior pair often very much longer in the male than in the female; the tarsi fouror five-jointed; but in some genera (e.g.
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