isiu.] 327 



a little before the apex of the wing, leaving the first posterior cell slightly open. 

 Very rare. I have only seen one specimen ( c? ), which I captured near Buckingham 

 in June, 1878. Zetterstedt refers this fly to Meigen's genus Tryphera, but I think 

 it belongs more properly to Exorista, unless it be placed in a new genus. 



E. FIMBRIATA, MgD. 

 This species is very similar in general appearance and character to E. vulgaris, 

 but difPers by having the scutellum quite black, by the general colour being more 

 glabrous and bluish-black, by the eyes being nearer together, especially in the males, 

 and by the anteunoe being shorter, those of the male having the third joint only 

 between two and three times the length of the second ; the abdominal segments 

 have setfe both on the disc and edges. Not common. I have captured it in Kent 

 and in Oxfordshire. 



E. MUTABILIS, Eln. 



This is one of the smallest Tachinids, being only about 4 mm. long ; it is placed 

 by Fallen, Zetterstedt and Meigen among those species which have naked eyes,* but 

 the specimen which I possess has them decidedly hairy, though the hairs are very 

 short. The palpi, scutellum and legs are all black, the eyes are said to be somewhat 

 approximated in the males, but are widely separated in the females ; the forehead 

 is rather prominent ; the antennae have the second joint a little elongated, and the 

 third joint from two to three times as long ; the arista is very long and thin, only 

 thickened for a short distance at the base and slightly pubescent ; the thorax is grey 

 and marked by four slender black stripes ; the abdomen is also grey with black 

 tessellations, which assume the form of semilunar spots or marks at the bases of the 

 second and third segments, which are armed with both discal and marginal setae; 

 the wings are a little nigrescent, the apical cross vein terminates near the apex, the 

 first posterior cell is nearly closed, and there are three or four small setaB at the base 

 of the third longitudinal vein. 



I have only seen one female specimen of this little species, which I captured 

 near Ulverston in Lancashire in August, 1888 ; the male is said to be more nigrescent 

 and less distinctly marked. The abdomen of this fly is spotted in a very similar 

 manner to that of Nemorilla fioralls, Fin. 



E. DUBiA, Fin. 



This little species is also aberrant, and Rondani suggests that it siiould be placed 

 in a new genus, which he would name Aporomyia ; its chief peculiarities are — 

 first, the insertion of the antennae opposite the centre of the eyes, and not as in 

 other species of Exorista a little above it ; second, the almost or quite complete 

 closure of the first posterior wing cell ; and third, the position of the outer cross 

 vein, which is nearly in the centre between the little cross vein and the bend of the 

 fourth longitudinal. The eyes are approximated in the male ; the antennae in the 

 same sex have the third joint only twice as long as the second, it is rather longer, 

 however, and thicker in the female ; the palpi are usually black, but sometimes 

 rufous ; the thorax is shiny black-brown in the male and indistinctly striped, grey 



* It would thus be either a Tachina or a Maacicera. 



