. The Cambridge natural history. Zoology. MUSCIDAE ACALYPTRATAE S03 ^Yallts elucidation. "Whether the Syrphidae, or some of them, possess a ptiliniim that helps them to emerge from the pupa is more than doubtful, though its existence has been affirmed by several authors of good ;- Series 4. Cyclorrhapha Schizophora Fam. 33. Muscidae acalyptratae.—This group of flies has been the least studied of all the Diptera; it is generally treated as composed of twenty or thirty different families distinguished. Fig. 240.—Diopsis apicalis. Natal. A, The fly ; B, ex- tremity of cephalic p
. The Cambridge natural history. Zoology. MUSCIDAE ACALYPTRATAE S03 ^Yallts elucidation. "Whether the Syrphidae, or some of them, possess a ptiliniim that helps them to emerge from the pupa is more than doubtful, though its existence has been affirmed by several authors of good ;- Series 4. Cyclorrhapha Schizophora Fam. 33. Muscidae acalyptratae.—This group of flies has been the least studied of all the Diptera; it is generally treated as composed of twenty or thirty different families distinguished. Fig. 240.—Diopsis apicalis. Natal. A, The fly ; B, ex- tremity of cephalic protuberance, more magnified. a, The eye ; 6, the antenna; C, middle of head, front view : <;, ocelli. by very slight characters. It is, however, generally admitted by systematists that these assemblages have not the value of the families of the other divisions of Diptera, and some even go so far as to say that they are altogether only equivalent to a single family. We do not therefore think it necessary to define each one seriatim; we shall merely mention their names, and allude to certain points of interest connected with them. Taken collec- tively they may be defined as very svicdl flies, with three-jointed antennae (frequently looking as if only two-jointed), hearing a bristle that is not terminally 'placed; frequently either destitute of squamae or having these imperfectly developed so as not to cover the halteres ; and possessing a comparatively simple system of nervura- tion, the chief nervures being nearly straight, so that consequently few cells are formed. These characters will distinguish the group 1 See on this difficult subject, Becher, Wicn. ent. Zeit. i. 1882, p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Ev
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