509. 

 SCyEVA UNICOLOR. 



Order Diptera. Fam. Syrphidae. 



Type of the Genus, Musca Pyrastri Linn. 



SciEVA Fab., Fall., Curt. — SyrphusFafi., Meig., Lat. — Musca Linn. 

 AntenncE inserted a little above the middle of the face, short, 

 porrected, 5-jointed, two basal joints furnished with long spiny 

 bristles, the 1st subovate, the 2nd short and cup-shaped, 3rd large 

 fleshy and ovate, 4th minute, inserted on the back of the 3rd, 

 5 th a moderately long naked seta, a little attenuated to the base 

 and pointed at the apex (3). 



Trophi short, inserted in a small cavity beneath the head. 

 Labrum considerably shorter than the lip, broad concave and 

 notched at the apex (lb). 



Tongue nearly as long as the lip and lanceolate (c). 

 Maxillce very small, curved and lanceolate (e). Palpi very short, 

 a little clavate and furnished with a few long hairs (/). 

 Lip large and terminated by 2 fleshy lobes, slightly hairy {g). 

 Head large, hemispherical, face sinuated in profile and thickly clothed 

 with pile (2) .• eyes large, lateral, slightly kidney-shaped, very pu- 

 bescent, contiguous above in the male (2*), but separated in t he female. • 

 ocelli 3, placed on a slight eminence at the back of the crown. Thorax 

 globose-quadrate : scutellum semiorbicular. Abdomen depressed, 

 and somewhat elliptical-ovate. Wings incumbent and parallel in 

 repose, the 4th longitudinal nervure not lobed, stigmata coloured (9). 

 Halteres small and capitate. Legs small, especially the anterior pair: 

 tibiae simple, slightly curved at the middle : tarsi depressed, 5-jointed, 

 basal joint the longest, especially in the hinder pair, 2nd turbinate, 

 3rd cup-shaped, 4th lunate, 5th small subovate (8 the anterior tarsus) ; 

 claws curved, pulvilli bilobed. 



Larvae attenuated to the head, feeding on Aphides. Pupae some- 

 what ovate pear-shaped, generally attached to the leaves or stalks of 

 \ plants. Reaumur v. 3. pi. 30. and 31. 



Unicolor Curt. Guide, Gen. 1240. No. 9. 



Chalybeous-black clothed with yellowish pubescence ; face pale 

 ochreous, with a pitchy line down the centre, darkest below, 

 crown of head brownish, region of the ocelli black; eyes reddish 

 brown ; antennae blackish, seta and underside excepting the 3rd 

 joint ferruginous ; sides of thorax and scutellum ochreous, with 

 a chalybeous tinge, 2 last joints of abdomen margined with ochre, 

 as well as aU the segments beneath : wings hyaline, nervures 

 piceous, subochreous at the base, subcostal cell stained with 

 brownish-ochre : halteres whitish ochre : legs ferruginous, thighs 

 piceous at the base, posterior with the apex only ferruginous, 

 their tibiae having a dusky line across the middle : tarsi piceous 

 above. 



In the Author's Cabinet. 



