126 Mittheil. d. Münchener Ent. Ver. 1881. 
venient to have a separate name for it, as very important 
bristles are inserted upon it, although it is not separated by 
any suture from the middle portion of the mesosternum. 
Hypopleura, a distinet piece, above the two last pairs of E 
coxae and behind‘ the sternopleura, from which it is separated 
by a suture. It answers the sede of the metasternum of Lowne, 
and the epimeron of the mesothorax of Hammond. 
Metapleura, immediately above the hypopleura and behind the 
pteropleura; a more or less convex, tubereular piece between 
the root of the wing and the haltere; in the Asilidae, it bears 
a characteristic, fan-like, row of bristles; between it and the 
metanotum the callus metanoti lateralis of lwew (Mon. N. A. 
Dipt. I, p. XIV) is placed, 
C, Other terms for parts of the thorax. 
Seutellar bridges, the little ligaments which, on each side 
of the scutellum connect it with the mesonotum, erossing the 
intervening suture. z 
Praesutural depression,, a triangular depression , usually 
existing in the angle, formed by the transverse mesothoraeic 
suture and the dorso-pleural suture; a slight swelling at its 
bottom is the praealar callus. | 
Praealar and postalar eallus; more or less distinet tu- 
bereles, which often exist, the former in front of {he wing, 
the latter between its root and the scutellum; they often bear 
characteristic bristles (In my former writings I have occasio- 
nally used the term praescutellar callus, for post-alar; but the 
latter is preferable). 
The word callus, here and elsewhere, is taken for the german 
Schiele, in the sense of tuberele, swelling, and not merely of 
a hardness of the skin (which is the sense of eallus in Webster’s 
Dictionary). In this, as in other cases, I have preserved the 
terminology adopted by Loew, in theMonogr. N. A. Dipt. Vol. 1(1862). 
Supra-alar eavity, an excavation of the mesothorax, above 
the root of the wing, along the edge of which the supra-alar 
bristles are inserted. It is divided in an anterior and a 
posterior portion by a little Iigament, which runs towards the 
root of the wing (alar freuum). 
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