2. LEPTIS 261 



horizontally separated from, those on the lower part, but there are 

 exceptions ; and many Chrysopilince bear a conspicuous depressed golden 

 pile on the thorax and abdomen of which no trace occurs in the Leptina: ; 

 they also often have an apical style to the antennae of a very different 

 nature to the long arista of the Leptince. 



The Palsearctic Genera are tabulated on pages 241, 242. 



2. LEPTIS. 



Leptis Fabricius, Syst. Antl, 69 (1805). 



Rather large or moderate-sized flies of conical shape, usually 

 yellowish red with brown or black markings. Pubescence 

 consisting of rather short hairs of a bristly nature (but never 

 approximating to macrochsetae), and of shorter soft down. 

 They are readily known by their short broad thorax and 

 their elongate narrow tapering abdomen which is often 

 translucent about the base. 



Head short but almost as broad as the thorax, lying close to the thorax but 

 drawn forwards rather flatly. Face very short, socketed between the large 

 eyemargins, quadrangular, quite bare ; the large eyemargins (or side-cheeks) 

 separated from the face itself by a deep channel, and bearing 

 long rather conspicuous pubescence ; frons of the male quite 

 bare and of the female almost so. Proboscis prominent, thick, 

 cylindrical, with two ribbed sucker-flaps ; palpi two-jointed, 

 conspicuous, rather drooping, lying alongside the proboscis, and 

 bearing considerable bristly pubescence. Eyes always bare, 

 approximated or even touciiing for a long distance on the frons 

 in the male, and with the facets all equal or only very incon- 

 spicuously differing in size ; but well separated in the female fig. \%%.—Leptis scoiopana 

 by the rather broad frons, which has a shallow transverse ^- ^ ^^• 



suture a little above the antennae. Antennae (fig. 188) approximated at the base, 

 porrect, and composed of three very short joints ; two basal joints almost equal in 

 length ; third joint short, conical, or almost reniform, with a long rather fine 

 upturned terminal arista. 



Thorax flatly arched, short, almost quadrangular, with blunted angles ; pubescence 

 on the disc short but usually well distributed and of a bristly nature, but with 

 depressed pile intermixed ; pleurae mainly bare, but the prothorax and the meta- 

 pleurse bear rather long distinct pubescence. 



Abdomen almost twice as long as the thorax, rather elongate or conical, with at 

 least seven obvious segments ; pubescence fairly abundant, often of a bristly nature 

 but never like adpressed pile, sliort except about the basal corners. Genitalia of the 

 male rather prominent, knobbed and blunt ; ovipositor jointed and appearing like an 

 eighth segment terminated by two pairs of ovate lamellae. 



_ Legs elongate, especially the hindmost, and the liind femora usually rather 

 thickened; coxae rather long; front tibice without spurs, but the posterior pairs 

 each with two conspicuous nearly equal spurs ; front tarsi with " touch-hairs " 

 beneath {vide page 236). 



Wings (fig. 187) large and broad, smooth and glittering, exceedingly minutely 

 pubescent ; costa and subcostal vein bearing minute spines ; cubital vein with a 

 ong conspicuous fork, of which the upper branch ends in or near the wing-tip and 

 the lower bi-anch about half-way between that and the upper veinlet from the 

 discal cell ; discal cross-vein placed at about one-fifth from the base of the discal 

 cell, and the origin of the cubital vein almost opposite the base of the discal cell • 

 discal cell elongate hexagonal, emitting three complete simple almost parallel 

 veinlets to the wingmargin ; postical vein with a simple wide open fork, of which 



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