2. TABANUS 413 



segments, and by the more extended whitish pubescence along the sides 

 of the hindmargins ; the female of T. hromius may be distinguished by its 

 rather larger size, by its browner grey abdomen which has more continuous 

 yellow pubescence along the bindmargins of the segments, by the more 

 brownish orange posthumeral calli, by the broader lower frontal callus, by 

 the absence of black hairs on the upper part of the side-cheeks, and by the 

 narrower inflation of the upper part of the postocular rim. In fact 

 (though the character is so slight as to require considerable care in 

 detecting) the black hairs on the upper part of the side-cheeks near the 

 base of the antennae distinguish T. maculicornis in both sexes from all its 

 alhes. T. Mikii, which has occurred in Denmark, is a larger species and 

 has a reddish belly. 



T. maculicornis is not an uncommon British species as I have records 

 from Devonshire (Avon Valley, Walkham, Ivybridge, and Lynton), Hamp- 

 shire (New Forest and its outskirts, Woolmer Forest, and Winchester), 

 Sussex (Plashet Wood), Surrey (Weybridge), Herefordshire (Devereux 

 l^ool), Worcestershire (Wyre Forest), Merionethshire (Barmouth), and 

 Perthshire (Kannoch), from June 10 to July 20. T. maculicornis and 

 T. cordigcr were both taken at Barmouth by Colonel Yerbury. It is 

 recorded from Scandinavia to the Tyrol. 



Synonymy. — Loew failed to distinguish this species from T. hromius, which 

 seems to be very extraordinary. It is almost certainly Walker's T. glaucus, and 

 this is confirmed by a female in the Entomological Club collection which is labelled 

 ""glatictis of Diptera Brit, confirmed by Mr Walker, 26/x/1868"; the specimen is 

 rather small but is otherwise quite normal. 



16. T. cordiger Wiedemann. Eyes with not more than one band. 

 Frons nowhere shining but with a brown cross-band from eye to eye 

 at the level of the antennae ; female with the middle frontal callus broad. 

 Antennae blackish on at any rate the basal joints. Male with a long 

 postocular ciliation. 



Rather small species, with unusually distinct grey spots 

 on the abdomen. 



^ . Head much larger than in the female, being semicircular and distinctly wider 

 than the thorax. Face and side-cheeks silvery white, with fairly dense 

 and fine rather long white hairs, while similar hairs extend all over the jowls 

 but not at all on to the back of the head ; back of the head with only a very 

 short pale postocular ciliation behind the narrow whitish grey bare postocular 

 rim (which grows a little wider on the upper part) until the upper third of 

 the head, whence a line of long forwards-curved black hairs extends almost to 

 the vertex, and intermingled with them are some shorter whitish hairs, 

 but behind the vertex these whitish hairs become more dense and conspicu- 

 ous ; ocellar tubercle small, globular, l)lackish brown ; frontal triangle pale 

 yellowish, but with an indefinite blackish cross-band above the middle which 

 is continuous with the blackened part of the eyes, and usually with a brown 

 band across just above the antennae which always develops into an obvious 

 darker cross-band between the antennte and the eyes and then extends a little 

 down the sidemargins of the face j this cross-band is an important distinctive 

 character and may be more obvious in some lights than in otliers. Palpi 

 whitish yello^v, short ; end-joint thick oval almost globular, being only 

 one and a third times as long as broad, and bearing longish white hairs 

 with a few (about half a dozen) black hairs intermixed towards the tip, and 

 this joint is thickened forwards so as to become rather club-shaped with a 



