. The Cambridge natural history. Zoology. CHAPTER 11 HYMEXOPTERA ACULEATA COXTIXUEI) DIVISION II. DIPLOPTERA OK WASPS EUMENIDAE, SOLTTAKY TRUE ^VASPS VESPIDAE, SOCIAL WASPS MASARIDAE Division II. Diploptera—Wasps. Anterior ivings longitudinally plicate in repose; the pronotuni extending hach, so as to form on each side an angle rejwsing on the tegula; the hascd seg- ments of the hind, hody not hearing nodes or scales ; the hind tarsi formed for simj^le iccdking. The species either solitary or socicd in their -^ , , . . • ,7 Fig. 26.—Upper aspect of pronotum habits; some existing in three and m
. The Cambridge natural history. Zoology. CHAPTER 11 HYMEXOPTERA ACULEATA COXTIXUEI) DIVISION II. DIPLOPTERA OK WASPS EUMENIDAE, SOLTTAKY TRUE ^VASPS VESPIDAE, SOCIAL WASPS MASARIDAE Division II. Diploptera—Wasps. Anterior ivings longitudinally plicate in repose; the pronotuni extending hach, so as to form on each side an angle rejwsing on the tegula; the hascd seg- ments of the hind, hody not hearing nodes or scales ; the hind tarsi formed for simj^le iccdking. The species either solitary or socicd in their -^ , , . . • ,7 Fig. 26.—Upper aspect of pronotum habits; some existing in three and mesonotum of a wasp, ^wme- forms, nudes, femcdes, and nes coarctcUa. «, Angle of prono- tum ; 5. tegula ; c, base of wing ; workers. d^ mesonotum. This division of Hymenoptera includes the true wasps, but not the fossorial wasps. The name applied to it has been suggested by the fact that the front wings become doubled in the long direc- tion when at rest, so as to make them appear narrower than in most other Aculeata (Fig. 27). This character is unimportant in function so far as we know,^ and it is not quite constant in the division, since some of the Masaridae do not exhibit it. The character reappears outside the Diploptera in the genus Zeucosjris —a member of the Chalcididae in the parasitic series of Hymen- optera—the species of which greatly resemble wasps in coloration. A better character is that furnished by the well-marked angle, ^ Janet has suggested that the folding is done to keep the delicate hind-margins of the wings from being 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-; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. London : Macmillan and Co. ; New York : The Macmillan Company
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