158 Syrphidae. 



front and especially hind metatarsus more or less darkened above. The 

 legs almost all pale-haired, only behind front femora some dark hairs; 

 hind femora not setulose beneath and the hairs dark yellow, only 

 towards the apex some short, black, bristly hairs; hind metatarsus a 

 little thickened. Wings somewhat short and somewhat brownish tinged; 

 upper marginal cross-vein curved, the upper angle nearly rectangular. 

 Squamulæ whitish yellow, with a yellow fringe. Halteres yellowish, 

 the knob blackish, 



Female. Eyes practically bare. Frons indistinctly trisulcate, coarsely 

 punctate at the sides, yellow-haired. Epistomal hairs shorter than in 

 the male. Antennæ with the third joint a little larger, longer than 

 broad, often paler than in the male. Thorax with short, somewhat 

 decumbent, yellow hairs. Abdomen shining, a little duUish in the 

 middle on second segment, with short, depressed hairs, longer at the 

 sides towards the base; they are more erect at the basal corners of 

 second and third segments, but there is no tendency to form bands. 

 The base of the fifth segment distinctly narrower than the hind margin 

 of fourth. Halteres orange. 



Length 6,5 to about 8 mm. 



The pupa is dirty yellowish, of a length of about 7 mm, with two 

 not long, reddish, somewhat granulated anterior spiracular tubes; it 

 is somewhat rounded at the posterior end, with a reddish yellow 

 spiracular process which is granulated in the outer part, not quite 

 cylindrical but somewhat transverse in section and with the indication 

 of a dividing longitudinal middle line above and below in the outer 

 part; the process is directed somewhat upwards or sometimes horizont- 

 ally backwards. 



This species is easily known from the other species in this group 

 by the want of thoracai and scutellar bristles; the female also is known 

 by the bare eyes, thus being the sole species with haired epistoma 

 and bare eyes (but only in the female sex). 



C. intonsa seems to be rather rare in Denmark, we have only ten 

 specimens ; Ruderhegn (Kryger), Tyvekrog (the author) ; on Lolland in 

 Kældskov and at Strandby (L. Jørgensen) and on Funen at Odense 

 (H. J. Hansen). The dates are in the latter part of April to ^^/s. Of 

 the species only a few specimens have been captured, the others have 

 been bred. The pupa was sifted from flood refuse in Ruderhegn by 

 Mr. Kryger on 7^ and ^^/i, the imagines came respectively on ^^/4 and 

 on 28/4— 7,5. — Zetterstedt communicates (VIII, 3172) that Stæger had 

 sent him a specimen of this species (his fraterna) under the name 

 mutabilis, and other specimens under the name venialis; as intonsa 

 had at that time not been found in Denmark and was not present 



É 



