4<S 



both make a deep lium when flying round one, quite unlike tlie note 

 produced by the smaller Tabanidrt." 



The Museum general collection of Diptera contains specimens of 

 7". sudeticus from Hungary and Spain ; additional localities given b\- 

 Brauer show that the species is generally distributed throughout 

 Europe. Writing with reference to Austria, Brauer says : — " Ikfore 

 sunrise the males ho\-er and swarm in the air above the iiighest 

 mountain-tops, e.g., the Dobratsch (according to Buchmiiller} and 

 Hohen Zinken (as stated by Frauenfeld), and sit on fences in the 

 sun during the morning after emerging from the pupa ; the females 

 are found on the leaves of shrubs and on cattle." 



Tabanus autumnalis, Linn. 



Plates 2 1 and 22. 



The striking sexual difference in the marking and coloration of the 

 abdomen exhibited by this species is well shown in the plates ; the 

 difference in the appearance of the head in the t\\ o sexes, caused by 

 the eyes meeting together in the males, which aie consequent!)' said 

 to be ''holoptic," is common to all Tabanidre, as also to many other 

 Diptera (compare Plates 1 1 and 26j. Of Tabanus aittiitinialis, which 

 in the South of England, according to Colonel Yerbury, is " one of the 

 commonest species of the genus," the British Museum posses.ses nine 

 modern British specimens (five males and four females), from the 

 following localities : — N.E. Essex and Colchester, Essex, date of cap- 

 ture unknown, ( W. H. Hariuood) ; Felden, Boxmoor, Herts, Jul)- 17th, 

 1 899 {A. Piffard) ; Harrow, Middlesex. July 1 5th, 1901 ( W. D. Lang) ; 

 Brockenhurst, \ew Forest, Hants, Ma\- 30th, 1896 {Miss Gertrude 

 Ricardo); Dun.ster, Somerset, August 1st, \<)02 {Lieut. -Colonel C. T. 

 Bingham); S. Devon,— .Avon Valley, May 15th, 1896, Warleigh 

 Marsh, June 24th, 1889, and Tamerton Folliott, June 29th, 1889 

 {Lieut.-Colonel Yerbury). The Mu.seum general collection contains 

 specimens of this species from France, Portugal, Hungar)-, Ital)-, and 

 Algeria. The localities given b\- Brauer {loc. cit.. p. 193) show that it 



