Chrysops suavis\ whitish; yellow intermediate stripe short, much nar- 

 rower than that in suavis, triangularly widened just below the antennae 

 and pointed below, not reaching below beyond the lateral deep pits ; 

 yellow lateral patches obliquely transverse, narrow, not triangular as in 

 mavis, extending from the eye-margin to the mouth-edge ; facial calli 

 blackish brown and shining, very large and somewhat circular, united 

 with a somewhat triangular undivided oral callus which is longer than 

 the width and is much darker than the facial calli ; buccal calli large, 

 hlackish and polished, extending from the eye-margins to the bases of 

 palpi, transverse and somewhat triangular ; jowls behind the buccal 

 calli black and shining, but very inconspicuously dusted through the 

 whole surface. Pubescence on the face very fine, yellowish, and almost 

 inconspicuous but on both the lateral patches and intermediate stripe 

 somewhat distinct, and on the calli almost entirely bare but on the 

 lower part of the oral callus somewhat recognisable ; pubescence on the 

 jowls rather numerous, long and yellow, much longer towards the 

 mouth-edge, and becoming shorter towards the eye-margin and back 

 of the head. Back of the head greyish black, slightly shining, and 

 slightly obscured by a whitish tomentum. Proboscis not stout, 



a little shorter than the depth of the head, brownish black, 

 slightly dusted with greyish yellow, bearing a few short and erect 

 rather bristle-like brownish hairs on the lower apical portion ; 

 sucker-flaps somewhat shining, furnished with a very few erect and short, 

 but longer than that on the stalk, blackish pubescence beneath ; palp? 

 lying against the proboscis, brown, darkened towards the tip, slightly 

 shining, but very inconspicuously dusted with greyish yellow specially 

 on the lower surface, very slightly curved forwards, narrow and 

 gradually narrowed towards the apex which is not pointed, longer 

 than half the length of the proboscis ; pubescence on the palpi yellow- 

 ish, fine but conspicuous, excepting of that on the inner surface. 

 Antennae slender, about as long as the thorax (not including the 

 scutellum), yellowish brown ; basal joint yellowish to pale yellow- 



