Chilosia. 157 



C. frontalis is very rare in Denmark, we have only two speciniens, 

 both females, taken in Ryget Skov at Farum Sø on 7'' 1911 (Kryger). 



Geographical distribution: — Northern and middle Europe down 

 to the Alps; it is not known from Sweden but is recently recorded 

 from Finland, 



14. C. intonsa Loew. 



1857. Loew, Verh. zool. bot. Geseli. Wien, VII, 588, 5. — 1862. Schin. 

 F. A. I, 274. — 1894. Beck. Nov. Aet. Leop. Garol. Akad. LXII, 394,50, 

 Fig. 112— 113. — 1901. Verr. Brit. Fl. VIII, 232, 12. — 1907. Kat. palåarkt. 

 Dipt. III, 30. — Eristalis fraterna Zett. p. p. (nec Meig.) 1843. Dipt. Scand. II, 

 798, 22 et 1849. VIII, 3172, 22 et 1859. XIII, 6017, 22. — 1894. Beck. 1. c. 

 248,74. — Eristalis latifrons Zett. 1843. 1. c. II, 811,35 et 1859. XIII, 

 6020, 35. — 1894. Beck. 1. c. 249, 84. 



Male. Eyes sparingly and short-hairy with v^hite hairs, the lower 



part quite bare. Frons æneous black, not pruinose, with a longitudinal 



gmove, yellov^Miaired above, black-haired below; vertex yellow-haired. 



Epistoma greyish pruinose, most below the antennæ, with shortish, 



yellow hairs on the sides; it is slightly hoUowed below the antennæ, 



the central knob not small, but somewhat 



low, not very prominent ; between the knob 



and the mouth edge the epistoma is sligthly 



hollowed, it is slightly descending and the 



lower part not much protruding. Eye- 



margins very broad, broadest downwards, 



very slightly pruinose, with short, yellow 



hairs. Occiput grey pruinose, this colour 



stopping below the eyes; it has whitish or 



yellowish hairs all round. Antennæ small, 



darker or paler brownish, third joint longer 



than broad : arista short, distinctly thickened „. „^, „ , ^ ^ ■ . 



, , 1 , , . -, 1 , Fig. 78. Head of C. intonsa cf. 



m about the basal third, very short-pubes- 



cent. Thorax dark æneous, fmely but densely punctate, not much 



shining; it is clothed with not long, erect, yellowish hairs; there are 



no bristles. Pleura with longish, yellow hairs. Abdomen æneous 



black, shining, second segment dull on the disc, third on the posterior 



half and in the middle line. Abdomen is clothed with short, yellow 



hairs, longer and erect towards the sides and longest at the base. 



Genitalia not large, somewhat pruinose. Venter greyish pruinose, with 



longish, pale hairs. Legs with the femora black, greyish pruinose, the 



apex yellow; tibiæ yellow with a blackish ring below the middle, 



largest on hind tibiæ; tarsi with the three basal joints reddish, but 



