August, 18i>0.i 173 



1 (6) Arista pluiuosc. 



2 (3) Thorax fulvous 1. spinimaiia,¥ln. 



3 (2) Thorax picoous. 



4- (5) Shoulder points and scutellum yellow 2. Jlavicauda, Mgn. 



6 (4) Shoulder points and scutellum black ...3. nervosa, Mgn. 



6 (1) Arista bare 4. liturata, Mgn. 



Sp. 1. — N. SPINIMANA, Fin. 



Head with frontal space bright red; face glistening white; antennae, palpi, and 

 proboscis yellow ; arista rather shortly but thickly haired ; thorax reddish-yellow, 

 marked with two black stripes, and having whitish reflections ; scutellum yellow ; 

 abdomen dark brown, with the last ring and the hypopygium tawny ; wings tinged 

 with brown, and having dark veins ; legs, together with the coxiB, yellow ; the ends 

 of the femora being sometimes slightly blackened ; fore femora armed with two 

 rows of long spines. Female very similar to the male, except by the form of the 

 abdomen. Length, 7 — 8 ram. Common. 



Sp. 2. — N. FLAVICAUDA, Mgn. 



This species closely resembles the last ; the forehead being red, and the antennae, 

 palpi, and proboscis yellow ; the thorax, however, is of a dark piceous brown colour 

 upon the dorsum, instead of being yellow and striped ; the sides and hinder part 

 being rufous ; the scutellum and shoulder points are red ; the wings have the third 

 and fourth long veins quite parallel ; the legs are similar in armature to those of 

 N. spinimana. Length, 7 — 8 mm. Not uncommon. 



Sp. 3. — N. NERVOSA, Mgn. 



Antennae, palpi and proboscis yellow ; arista rather shortly but thickly haired ; 

 thorax dark grey as in N. flavicaiida, but without any rufous tinge ; shoulder points 

 and scutellum black ; abdomen dai'k bluish-grey, with red apex ; wings flavescent, 

 with the third and fourth long veins slightly divergent, and darkened towards the 

 apices ; legs yellow. Length 7 — 8 mm. Rare. 



Sp. 4. — N. LITUBATA, Mgn. 

 This species differs from all the others by having the arista bare. The head 

 has frontal space yellow in front and dark grey behind ; face glistening white ; 

 antennge, palpi and proboscis ochreous ; thorax black covered with grey tomentum ; 

 shoulder points and scutellum grey ; abdomen shining blacls ; wings yellowish-grey, 

 darker towards the upper margin and apex ; legs yellow, armed with spines as in 

 the other species. Length 6 mm. Rare. 



Mr. Verrall, in the third part of his List of British Diptera, in- 

 troduces the three following additional species of Norellia. I will 

 therefore briefly describe them. 



N. AUMiPES, Mgn. 



Antenna; yelluw, third joint marked with brown on the upper surface ; thorax 



