78 [March, 



black bands, the central one being often bifid ; scutellum black or grey ; abdomen 

 tessellated with black and white patches, more or less arranged into transverse bands, 

 sides rufous in the male, ventral surface yellow in the male, and black in the female ; 

 wings with the veins more or less clouded, the thickened inner cross vein forming a 

 dark spot ; legs with tibiae and tarsi ferruginous, and the femora nigrescent. Meigen 

 states that the antennae and palpi are nigrescent in his T. variegata, but I believe it 

 is only a variety of the above species. T. dorsalis, of the same author, seems to be 

 only another variety, in which the wing veins are almost unclouded. Not uncom- 

 mon ; has been bred by Mr. Billups from Cheimatobia boreata. 



T. ALPINA, Mgn., ^. 



coerulescens, Mgn., $ . 

 This species differs from the former by having the thorax less distinctly striped, 

 the wing veins slightly, or not at all, clouded ; the legs wholly ferruginous, with the 

 exception of the last joints of the tarsi, which are black, as well as the upper sur- 

 faces of the fore femora occasionally in the male ; the sides of the abdomen and 

 venter are reddish-yellow in the male (as in cestroidea), hnt blue-black in the females. 

 Not common ; in Mr. Dale's and Miss Decie's collections. 



T. scuTELLATA, Newman. 

 I have introduced this species into my list upon the authority of the late Mr. 

 E. Newman, by whom it was briefly described ;* I have not seen a specimen, and 

 doubt whether it is a distinct species : the only characteristic feature is the ferru- 

 ginous scutellum ; and, as Macquart says, that this part is sometimes rufous at the 

 apex in T. ccBrulescens {alpina, ? ), I suspect it is only a variety of that species. 



26.— CLYTIA, Desv. 



Gen. cJi. — Head large ; eyes bare ; forehead and face prominent ; 

 frontalia and cheeks wide in both sexes; frontal stripe narrow; fronto- 

 orbital bristles only extending to a little below the root of antennse ; 

 vibrissse small, facialia almost bare ; antennae short, second joint small, 

 third joint from half to twice as long again as the second ; arista 

 nude, with second joint a little prolonged ; abdomen subglobose in the 

 males, with setae only on the margins of the segments ; wings with the 

 first posterior cell ending near the apex. The little flies belonging 

 to this genus are of a yellowish-grey colour, with a more or less 

 luteous abdomen. 



1 (2) Legs black 1. continua,Tnz. 



2 (1) Legs yellow 2. rotundiventris, ¥ln. 



C. CONTINUA, Pnz. 



Frontalia and face golden-yellow in the male, and yellowish-white in the female ; 

 frontal stripe brown, very narrow in the male, and about twice as wide in the female ; 



* Ent. Mag., i, 507. 



