. Bulletin - United States National Museum. Science. 7 ' Vf/r'Tm The asilid abdomen typically has eight well developed tergites in the males and females, those beyond being incorporated within the terminalia or the ovipositor. In the female Asilinae, if the proctiger be counted, ten segments can be discovered, but in other subfamilies sometimes fewer. In one tribe and subfamily the pre- abdomen is reduced to six visible segments. Macro- chaetae, with few exceptions, are present on the sides of the first tergite. They are more rarely present on remaining tergites, still more uncommonly on stern
. Bulletin - United States National Museum. Science. 7 ' Vf/r'Tm The asilid abdomen typically has eight well developed tergites in the males and females, those beyond being incorporated within the terminalia or the ovipositor. In the female Asilinae, if the proctiger be counted, ten segments can be discovered, but in other subfamilies sometimes fewer. In one tribe and subfamily the pre- abdomen is reduced to six visible segments. Macro- chaetae, with few exceptions, are present on the sides of the first tergite. They are more rarely present on remaining tergites, still more uncommonly on sternites. In a few asilids the abdomen departs from the usual stout and tapered, cylindroid form to become wide and greatly flattened (Blepharotes West wood) or wide and stout and robust {Hyperechia Schiner, Laphria Mei- gen). Rarely are asilids petiolate. A few have long, very slender bodies, as in the sluggish Leptogastrinae. The first sternite may be subdivided into two or more bands of thin chitin. In the Asilidae the male terminalia are complex and, as is true of so many Diptera, quite variable. Since there is still much confusion of terms in dealing with these structures, I shall define below the terms I have adopted in this work. I have consulted both Crampton (1942) and Cole (1927), but I have relied chiefly on the terminology employed by Emden and Hennig (1956). The genitalia of the asilids and Diptera in general Text-Figure 4.—a-b, Bombomima fuhithorax Fabricius: a, deep dissection with right clasper and pseudoclasper removed; B, with gonopod removed, c, Nerax interruptus Macquart, with superior forceps and gonopod removed. D, Neoaratus sp., with superior forceps removed, revealing paralobus and clasper. comprise the ninth abdominal segment with marked modifications in consequence of its function. The ter- gal component is referred to as the epandrium, except where it is furcate, in which case it is here styled the superior forceps; this structure bears the proctiger at
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