IGl CATALOGUE OF DIPTERA 



dark line above : face silvery : wings broad, in the male more 



hyaline, with a minute costal line as in that species : the hind 



tarsi are pale at the base : the lamellae are fringed with longer 



hairs. 



Inhabits marshes near Holywood. August. 



D. linearis S . 



Resembles D. acuticornis, in the form of the wings and all other cha- 

 racters, except the short antennee : very rare. 



D. plumipes. Thorace ferruginoso, antennis rufis, ap'ice 

 nigris, tibiis et metatarsis ajiteriorihus riifis, alls inincto 

 nervoque transverso fuscis. Mas. ArticiiUs 4 nltimis 

 tarsornm articorum hrevihus lat'isshnis nigris, candido 

 inicaniibiis. 



D. htoreus. Thorace ferruginoso, a?iten?iis hasi stibtus, 

 tihiisque riifis, alis puncto nervoque transverso fuscis. 

 Mas. Articulis quatuor nliitnis tarsorum a7iticorum crassi- 

 orihus ultimo albo micante. 



D. plumipes. H. in Zool. J. 



These two species agree in all particulars but the following ; the 4th 

 longitudinal nervure is slightly bent at the dusky spot, and the 

 transverse sinuate in the first, which has also the antennae, and 

 shanks of a brighter red : the fore metatarsus of the male is long and 

 rufous, the following joints very broad, the end of the shanks and 

 all the joints of the feet glossed with pure white : in the other the 

 fore metatarsus is black, rather short, and incrassate at the end, the 

 remaining joints are not nearly so broad as in D.plimipes, the last 

 only with a dull whitish gloss : the antennae have only a very 

 obscure red spot on the underside of the first joint; and the red 

 colour extends over a smaller portion of the thighs. 

 D. litoreus is not rare on the sea-coast ; D. plumipes in the 



moory uplands of Wicklow. 



D. rupestris. Obscure ceneus, femoribus posteriorihus, tibiis- 

 que ferrugineis, alis intus subrotundatis obscuris. Mas. 

 Femoribus imberbibus, tibiis posticis medio constrictis. 

 (Long. .16.) 



Colour darker than in D. campestris : face obscure sulphureous ; in 

 the female almost grey : whitish above the mouth : coxos black : 

 thighs ferruginous, fore pair almost to the tip, hind only at the 

 ends, dusky : tips of hindshanks and the feet black, the shanks 



