HEAD. fit 



the thorax ivkhout the scutellum* projecting horizontally in front of 

 the head ; palpi, as seen in the natural position, extending slighthf 

 beyond the proboscis, their inner sides grooved so as to form a sheath 

 for the latter, to which in life they are applied so closely as entirely 

 to conceal it ; base of proboscis suddenly expanded, beneath into a 

 large onion-shaped bulb. 



Head rather narrower than the thorax ; eyps separate in 

 Vjoth sexes, though the front in the $ is distinctly narrower 

 than in the 9 of Stomoxys ; width of the front at the vertex in 

 the (J ranging from one-third to rather more than one-half of 

 that of the eye at its widest part, and in the 9 froni one-half to 

 rather more than one-half of the width of the eye; vertex 

 slightly depressed below the level of the eyes ; facial pit deep, 

 undivided by a septum, extending to the oral margin, which is 

 up-turned and prominent ; curved suture {Bogennaht of Brauer 

 and von Bergenstamm) ending in a pit above the lower margin 

 of the eye, the pit on each side being prolonged into a shallow 

 depression {transverse impression of Hough) separating the face 

 from the jowls f ; the latter narrow in fi'ont, broad and rounded 

 posteriorly, crossed by a line of black bristles which passes on to 

 the occipital surface of the head, and is continued as the series 

 of small bristles marking off the posterior orbits ; jowls thickly 

 clothed with fine hair behind the line of black bristles just 

 mentioned, in front, like the face, bare ; vibrissal ridges sharp 

 and narrow, not broadening out below as in Stomoxys, Huematobia, 

 and other genera of Muscinoe, ciliated to the level of half the 

 length of the third joint of the antenn.iR, or higher ; vibrissoe 

 small, fine, no elongated or conspicuous vibrissa even on the 

 vibrissal angle, which is widely separated from the oi'al margin. 

 Underside of the roof of the buccal cavity with two large dark 

 brown strongly chitinised patches, very conspicuous when the 

 head is viewed from below in every species except Gl. fusca and 

 Gl. Ivngipennis. Eyes bare, in both sexes the facets in front 



* The length of the visible portion of the palpi, i.e. the portion 

 projecting hej'ond the buccal cavity, in Glossina vinrsitn7is, Westw., is 

 just under 3 millim. (1^ lin.) ; the length of the entire proboscis, measured 

 from the base of the bulb, is 3^ millim. (1^ lin.). 



t I follow Mr. G. H. VerraU (" British Flies, Syrphidne, etc.," 1901) in 

 using the term jowl for the part of the head beneath the eyes, which in 

 former papers I have called the cheek {Backr, of German authors), 

 separated from the face (Gorman, Wangc) by the curved suture or its 

 prolongation. In 1808 Hough (" Proc. Acad. Nat. Sc, Philadelphia," 1808, 

 p. 108) pi-oposed the terms genn and bi(ccr/ for Wringr and Backc respec- 

 tively. 



