222 [March, 



males ; ocelli large and prominent ; frontal bristles wanting ; arista 

 bare, or pubescent ; alulets small, but with the scales usually unequal 

 in size ; abdomen cylindrico-conical, with only four distinct segments, 

 each of which is mostly marked with three spots, one central and 

 elongated, and two lateral and round ; wings veined as in the Hovia- 

 lomyicB, but with the axillary less approximated to the extremity of the 

 anal veins : hind tibiae of the males often bearded on one or the other 

 side with long hairs. 



Females with the eyes separated by a moderately wide space, fur- 

 nished with a single row of small bristles on each side ; abdomen 

 pointed, and marked as in the males, but with smaller spots. 



Sect. 1 — Salteres pale. 



Macquarti, Staeg. 



triquetra, p. Macq. 

 Zetterstedti, E-ond. 



triquetra, Fall, et Zett. 



3. ciLiPES, Hal. 



triquetra, p. Macq. 

 tibialis, Staeg. 

 Stcegeri, Zett. 



4. TEiQUETRA, Wicd. et Meig. 

 nudipes, Zett. 



Sect. 2 — Salteres black. 



5. GIBBEKA, Meig. 6. ATERRIMA, Meig. 



cerea, Zett. ? 



This group, though closely related to the Homalomi/ice, is well 

 characterized, and has been recognised as forming a distinct genus by 

 most modern authors, except Schiner, who, in his most valuable work 

 (Fauna Austriaca, Diptera), still retains it in his great and hetero- 

 geneous genus Anthomyia. It was elaborately monographed by H. 

 Loew in 1874,* and revised by Eondani in 1877.t 



The British species in the first section may be thus tabulated : — 



Hind tibiae of <? with long hairs on both outer and inner sides 1. Macquabti. 



„ „ „ on inner sides only 2 Zetterstedti. 



„ „ „ on outer sides only 3. cilipes. 



„ „ „ on neither side 4. triquetra. 



All these four species have the alulets and wings more or less fuscous or nigres- 

 cent. A. Macquarti, which is the most common, is also usually the largest ; besides 

 liaving long ciliae on both sides of the hind tibia", the males are also furnished with 

 a single long straight bristle in the middle of the under-side of the middle femora. 

 The females sometimes have tlie fore tibia; piceous, or even testaceous, and may be 

 found in abundance on horse-droppings in roads in woody places. I know of no 



* Entotnologische Miscellen., Breslau. t Dipterologia; Italicsu Prodromus, Vol vi. 



