92 t^i"'!' 



prominent ; second antennal joint a little elongated, but two or three 

 times shorter than the third ; arista with the second joint more or less 

 prolonged ; wings with the veins setigerous. 



1 (2) Arista with the second joint a good deal elongated ; third longitudinal 



vein armed with bristles at the base 1. plebejus, Fin. 



2 (1) Arista with the second joint yery little prolonged ; second, third, and 



fourth longitudinal veins all setigerous 2. frontatus, Bohem. 



D. PLEBEJUS, Fin. 

 Thorax light bluish-grey, with four indistinct black stripes, the central ones 

 very narrow ; scutellum grey ; abdomen cinereous, with a broad irregular black band 

 on the posterior margin of each segment ; the second and third segments mostly 

 red on the sides ; orbito-frontal bristles in a double row in both sexes ; antennae 

 black or brown ; arista with the second joint about one-fourth of the length of the 

 third J palpi red ; wings with the third longitudinal vein armed with a few setae 

 near the base ; legs black, with tibite piceous. This rare species was captured by 

 Mr. C. W. Dale, at Freshwater, I. of W., in June, 1880. 



D. FRONTATUS, Eohem. 



This species resembles the former in general form and colour, being only of 

 rather a more yellow-grey ; it differs, however, by having the eyes much nearer 

 together in the male than in the female, and by the frontalia having only a single 

 row of bristles on each side in the former sex ; the two first joints of the antennae 

 are also testaceous, and the arista has the second joint very short, and the third 

 thickened along its basal third ; the palpi are black ; the proboscis is much longer 

 than in Z). plebejus, also narrow, pointed, and projecting forwards; the abdomen is 

 rather lighter in colour than in D. plebejus, marked by irregular black bands and 

 reflections, and has the sides of the segments red and translucent ; the wings have 

 the first (auxiliary branch), third, and fifth veins setigerous ; and the tibiae are darker 

 in colour than in D. plebejus. This species, which is not uncommon, is quite 

 aberrant, and miglit be placed in the genus Aphria as well as in Demoticus, the 

 proboscis being narrow and somewhat elongated, and the fronto-orbital bristles in a 

 single row only in the male. Zetterstedt and Boheman seem only to have known 

 the female, and Scliiner does not allude to any difference between the sexes. I have 

 captured tliis fly in different parts of England. 



5.— GONIA, Mgn. 

 Gen. ch. — Body ovato-oblong ; head very wide and tumid ; eyes 

 bare, small, and very widely separated, in both sexes ; frontalia broad 

 and ciliated, with a number of rather fine bristles arranged irregularly 

 in several rows in both male and female ; cheeks and mentum swollen, 

 and more or less hairy ; antenna; long and narrow, with the third 

 joint much longer than the second, ca[)ecially in the male ; arista bent 

 u])vvards in the middle, and having tlie second joint much elongated, 

 it Ix'ing in sonic species rather longer, and in others rather shorter, 



