72 [March, 1894. 



nearly to its apex ; costal spine large ; third longitudinal vein (only) armed with 

 seven or eight setae, which extend from its base two-thirds of the way to the little 

 cross vein ; legs black. Length, about 6 mm. 



I received the specimen which I have described some years ago from Herr 

 Kowarz, labelled a doubtful species of Demoticus. I have not met with it in Britain, 

 but have ventured to name and describe it as an interesting addition to the genus. 

 The Tachina soror of Zetterstedt must also be included in the genus Bithia. 



GONIA, Mgn. 



In my notice of this genus I omitted to call attention to a valuable paper by 

 Jlerr Kowarz* on the determination of the species. These are very difficult to 

 discriminate, and it is not easy to find characters by which they may be distinguished 

 from each other ; as Kowarz observes, the relative lengths of the joints of the arista, 

 which have been used for this purpose by some authors are so variable that they 

 cannot be depended upon, so he has selected the number of the spines upon the 

 edges of the abdominal segments as diagnostic characters. He found that in one 

 group of species the hind margin of the first ring has either four or six setae, while 

 in the other group there are only two. 



In arranging the British species I was not able to avail myself of these char- 

 acters, for at present no Oonia found in Britain will fall into the former of these 

 Divisions. 



I have differed somewhat from Herr Kowarz in the determination of species, 

 for he considers the G. trifaria, Zeller, to be only a variety of G. capitata, De Geer, 

 and also makes G. lateralis, Zeller, to be identical with G. ornata, Mgn. ; the long 

 list of synonymns, which he gives under each of these species, will show what a 

 difference of opinion there has been, and how difficult it is to decide. 



Gr. DIVISA, Mgn. 

 In May, 1893, the Kev. E. N. Bloomfield sent me two specimens of this rare 

 species, which were captured at Maidstone and Eastbourne. 



GERMAEIA, Dav. 

 G. KuncEPs, Fin. 



In November, 1893, the Rev. E. N. Bloomfield also kindly sent me a specimen 

 of this fly, which had been taken by Mr. Harwood in Essex (near Colchester). 



THETPTOCEEA, Mcq. 



T. LATIFRONS, Mgn. 



Erontal space wide, occupying more than a third of the width of the head ; 

 frontal stripe pale red, rather wider than the sides ; antennae with the first and 

 second joints rufous, and the third brown ; arista nearly straight, with the second 

 joint about one-fourth of the length of the third ; palpi yellow. Thorax nigrescent, 

 covered, with cinereous pubescence, and marked by a pale central stripe and two 

 lateral, subquadrate, rather indistinct spots of a reddish-brown colour. Abdomen 

 short and conical, of a pale bluish-grey colour, covered with brown punctures and 



* Wiener Ent. Zeitung, vii, J.ihrg. (Jan., 1888). 



