April, ISf'l. 1 89 



first and accond joints somewhat elongated, the first being, however, 

 much shorter than the second, which again is three or four times 

 shorter than the third ; body large, with a wide oval abdomen, furnished 

 with numerous hairs and bristles ; fore tarsi dilated in the female, in 

 which sex the frontalia are wnder than in the male, and have a double 

 instead of a single row of fronto-orhital setae on each side. 



1 (8) Abdomen armed with bristles, but not clothed with soft hair. 



2 (7) Palpi filiform. 



3 (4) Abdomen subglobose and black 1. grossa, Jj. 



4 (3) Abdomen oval and ferruginous. 



5 (6) Antennte rufous 2. fera,Tj. 



6 (5) Antennae nigrescent 3. tessellata, F. 



7 (2) Palpi clavate (faljricia,Dsv.) 4. /eroa?, Pz. 



8 (1) Abdomen clotlied with soft hairs as well as armed with bristles (servillia, 



Desv.). 



9 (10) Abdomen with the sides red 5. lurida,¥. 



10 (9) Abdomen with the sides not red 6. ursina, Mgn. 



E. GROSSA, L. 

 This handsome fly, the largest of the British Muscids, has the thorax, abdomen 

 and legs black. The face is yellow, and the cheeks, chin and all the back of the head 

 are clothed with yellow hairs. The first and second joints of the antennae are rufous, 

 the third is black, rather small, and not quite half so long as the secoud. It is not 

 common, and has been bred from cocoons of Bomhyx trifolii. 



E. FERA, L. 

 This species varies a good deal, but it is characterized by the thorax being 

 black, with testaceous shoulders and sides ; by the abdomen being yellow and pellucid, 

 marked with a wide, longitudinal, dorsal black stripe ; by the face being yellow, and 

 the head clothed with yellow hairs ; by the antennse having the first two joints 

 rufous, and the third black, which is about half the length of the second ; by the 

 legs (including the tarsi) being wliolly yellow in (he female, but having the basal 

 lialves of the femora black in tlie male. This is tlie most common species in the 

 genus, and has been bred from the cocoons of several moths. 



E TESSELLATA, F. 

 This species differs from IS.fera by having the dorsal stripe on the abdomen 

 narrower, and sometimes interrupted; by the thorax being grey ratlier than black, 

 with the front and sides pale, and with indistinct dorsal stripes ; by the face being 

 white, and the hairs on tlie occiput, &c., pale yellow; by the legs being black or 

 piceous ; and tlie antonuie black or grey, with the second joint rufous at its extremity. 

 The third joint i.s wide and large, and only about one-third shorter than the second. 

 Tliis species is rare. 



E. FEROX, Panz. 



This species is very t^iuiilar in form and colom- to the last. lis cliaractoristic 



I 



