DIPTEROUS FAMILY PANTOPHTHALMID^. 571 



longitudinal vein, and area immediately below as far as third 

 longitudinal vein ; tip of wing, including distal j^ortion of first 

 submarginal and entire second submarginal cell, except its 

 extreme base, somewhat darker than hind border (when viewed 

 against a light background), and separated from distal costal 

 blotch by an ill-defined and irregular pale area ; costa ochi^aceous- 

 tawny or light cinnamon-brown (mummy-brown at base and 

 above distal costal blotch), remaining veins cinnamon- brown, 

 ochraceous-tawny or ochiaceous-b\iflf (in dnrker areas corre- 

 sponding in tint to adjacent membrane). Halteres: stalks cinna- 

 mon-buff, knobs blackish brown. Legs : hind femora of uniform 

 tliickness (nob incrassate towards distal extremity) ; femora and 

 tibiae russet-coloured, clothed with fine, dark brown hair, flexor 

 surfaces of front tibiae clothed with short, glistening, ochraceous- 

 tawny hair; first segment of front and middle tarsi ochraceous- 

 buff (cinnamon-brown at extreme tips on flexor surface), first 

 segment of hind tarsi cream-buff (light cinnamon-brown at 

 extreme tips on flexor surface), last four segments of all tarsi 

 ochraceous-tawny, clothed Avith minute, appressed hairs of similar 

 colour ; claws rufous-tawny at base, then black ; pulvilli and 

 empodia ochraceous-butf. 



One cS , Brazil : R. Amazons (precise locality unknown) (II. W. 

 Bates). 



Pantophthahnus hellerianus, which, in the S sex at any rate, 

 agrees with F. m-gyropastus Big., in having the dorsal surface of 

 the abdomen silvery, is readily distinguishable from that species, 

 tjiter alia, by the dorsum of the main portion of the thorax being 

 not only much paler but also devoid of dark spots (cf. notes on 

 F. argyropastus below). For distinctions from P. hatesi Austen, 

 vide supra, p. 568. 



Finally it may be added that the example of P. hellerianus in 

 the National Collection exhibits, on the dorsal surface of its 

 abdomen, several specimens of the pseudo-parasitic Acarid 

 mentioned in the present paper in connection with P. tabaninus 

 Thunb., and other species ; in this case there is also a number of 

 very much smaller mites on the doi'sum of the thorax. 



Pantophthalmus argyropastus Big. 



Megalomyia argyropasta Bigot, Ann. Soc. Ent. Fr., 5° Ser., T. x.. 

 Bulletin, p. v (1880). 



Megalemyia argijropasta Bigot, Ann. Soc. Ent. Fr., 6' Ser., T. i. 

 pp. 455,458(1881). 



An examination of the holotype male of this species, formerly 

 in the Bigot collection and presented to the British Museum 

 (Natural History) by Mr. J. E. Collin, F.E.S., shows that, in spite 

 of Bigot's misleading statement to the effect that the thoi-ax is 

 marked with " three, somewhat indistinct, blackish bands," the 

 dorsum of the main portion of the thorax (scutum) is actually 

 imicolorous, with scarcely a trace of longitudinal stripes, but 



