*, 



25 6 Proceedings of the Royal Irish Academy, 



of the abdomen yellow. In the var. tricinctus the femora are less 



extensively yellow, and the longitudinal black stripes on the thorax 



broader. 

 Cricotopus sp. — M. : a single 2 taken on the shores of a lough near 



Westport (G.) represents a tiny species only 1 mm. in length, which 



I am not able to identify. 

 Orthocladius sordideUus Ztt.—Gl. (G-.). M. : Aehill and Belclare (H.) ; 



Mulranny, "Westport, Lough near Westport, and Castlebar Lough (G.). 



An abundant and very variable species. 

 'Tanytarsus flavipes Mg. — M. : Westport, one $ in garden (G.). A very 



distinct species of this hairy -winged genus. Thorax and abdomen black, 



the latter with long, pale yellow hairs ; legs pale yellow, and hairy. 

 T. punctipes Wiecl. — M. : Lough near Westport, one $ (G.). Distinguished by 



its uniformly black thorax, scutellum, and rnetathorax, light green 



abdomen, whitish wings, and pale legs, with a small black dot on the 



extreme tip of the middle and hind tibiae. 

 *T. pusio Mg. — M. : Aehill, one $ (H.); Lough near Westport, one $ (G.). 



A light green, neat little species (2-5-3 mm.), with three shining black 



longitudinal stripes on the thorax, the middle one of which is divided by 



an extremely fine line of ground-colour. The genitalia are pale yellowish 



and conspicuous. 

 T. sp. — CI. : one <? and one 2 (G.). A species with entirely black thorax, 



and the front metatarsus half as long again as the tibia. This may 



be gmundensis, Egger, but the condition of the specimens renders this 



identification doubtful. 

 *Metriocnemus fuscipes Mg. — M. : Knappagh, three $ and one 2 ; Belclare, 



one $ and one 2 ; Clogher, one $ ; Lough near Westport, three $ (G.). 



An easily recognized little species, black throughout, with hairy wings, 



strongly hairy abdomen, and hairy legs. Size: 3-4 mm. The colour of 

 the halteres, as a ride, is black in the $ and dirty white in the 2 ■ 

 Three of the $ recorded above, however, have the halteres the same 

 colour as those of the 2 • I am convinced that they are all of one 

 species; and hence must regard the colour of the organs in question 

 as variable. 

 **M. modestus Mg. — M. : Lough near Westport, one $ , and Belclare, one $ (G.). 

 This is a species new to the British list, and is not the M. modestus of 

 Walker's "Insecta Britannica " (vol. hi, p. 190), nor of Verrall's "List," 

 since Walker placed his species in the group characterized by having the 

 "fore tibia longer than the fore metatarsus by two-thirds." Walker's 

 description (as is so often the case) is useless ; and in the determination 



