64 DESCRIPTIONS OF THE 



with a yellow stripe on each side, and an angular spot of the same 

 colour between ; scutellum of the female yellow, sometimes 

 reddish yellow ; metathorax black, in the female rust colour 

 beneath ; 4th segment of abdomen of male with a black spot on 

 each side of its hind border ; telum of female rust colour, black 

 above at the base and banded with black before the tip, some- 

 times black altogether above and at the tip beneath ; legs yellow ; 

 thighs of the female almost white ; wings varied with white, and 

 with four large black spots, varying in size, three of them costal, 

 and the 4th near the lower border where the 5th long and the 

 cross nervures meet ; there is also a pale brown spot at the base 

 of the wing, between the 3d and 4th nervures ; cross nervures of 

 the female, and sometimes of the male, bordered with brown ; a 

 variety has the middle costal spot and the one near the lower 

 border joined together, and thus forming a band across the wing. 

 (Length of body 1| — 2 lines ; of wings 2f — 3h lines.) 



June ; near London ; New Forest, Hampshire ; Isle of 

 Wight. 



FoRELLiA. — Desvoidy. 



Distinguished by the rich saifron colour, the peristoma angular and 

 hardly longer than broad, the slightly prominent epistoma, the 

 long and nearly cylindric 3d joint of antennae, the yellow wings 

 spotted with black. 



Body downy, rather long ; mouth short ; feelers nearly cylindric, 

 not thickened ; antennae rather long ; scutellum short, obtuse, 

 nearly triangular, almost hiding the metathorax ; abdomen nearly 

 flat above, of the female longer than of the male, and gradually 

 narrowing from the base to the tip ; telum of the female with 

 half the length of the abdomen ; cross nervures of wings slightly 

 curved, short one having the upper, longer one the lower end 

 nearest the tip of the wing. 



Sp. 1. For. arnicae. Male and Fem. Saffron colour, wings 

 slightly yellow, varied ivith grey and white, and with four 

 large black spots. (Fig. 6.) 



Musca arnicae . Linn. Syst. Nat. II. 997. 115; Faun. Suec. 

 1872; Gmel. Sijst. Nat. V. 2856. 119; 

 Fabr. Ent. Syst. IV. 352. 166; Schrank, 

 Austr. Ins. 959 ; Aldrov. Ins. 346. Pi. I. 

 fig. 5; Scop, Ent. Cam. 941. 



