Arrhinomyia. 365 



Table of Species. 



1. Abdomen with silvery white bands 1. cloacellae. 



— Abdomen quite black, without bands 2. tragica. 



1. A. cloacellae Kram. 



1910. Kram. Bericht d. Tåtigk. Ges. Iris in Buntzen in 1906—09, 31, 32 

 et 1911. Abhandl. Nat. Gesell. Gorlitz XXVII, 133 et 1917. ibid. XXVIII, 273, 

 155. — 1921. Baer, Zeitschr. f. angew. Ent. VIL 373. — 1924. Stein, Arch. f. 

 Naturgesch. 90, 6, 144, 1. 



Male. Frons above fully as broad as the eye, widening downwards. 

 Orbits blackish grey; cheeks and jowls bluish grey. Frontal stripe 

 black. Vibrissæ ascending at least to two thirds of the height. Orbits 

 with a few black hairs; jowls black-haired. Occiput grey, with sparse 

 pale hairs, and a row of black hairs behind postocular bristles, An- 

 tennæ black, third joint about five to six times as long as second,,. 

 a little broad; arista thickened in basal third, second joint short. 

 Palpi black. Thorax black, shining, thinly bluish grey pruinose, 

 with four black stripes, the median narrow, not approximate, abbre- 

 viated behind. Thorax sparingly black-haired; fonr postsutural 

 dorsocentrals, Scutellum with some small discai, but no apical bristles. 

 Abdomen black, shining, the three last segments with a narrow 

 silvery front band, interrupted in the middle. Abdomen is somewhat 

 strongly black-haired, with discai and marginal bristles, on second 

 segment a pair of small bristles, third with a pair of discai and mar- 

 ginal, fourth with a pair of discai and a row of marginal and fifth 

 almost quite covered with bristles. Genitalia small. Legs black; 

 hind tibiæ with somewhat dense equal anterodorsal bristles with 

 one or two longer. Wings a little dark tinged; veins black; posterior 

 cross-vein steep. Upper squamulæ whitish, lower yelloNvish or light 

 brownish yellow. Halteres dark. 



Female. Similar; frons somewhat broader, and abdominal bands 

 a little broader. 



Length 6 — 6,5 mm, according to Kramer it may reach 8 mm. 



A. cloacellae does not seem to be just rare in Denmark; Erme- 

 lund (the author), Dyrehaven (Schlick), Grib Skov (Kryger); on 

 Funen at Nakkebølle and Faaborg (C. S. Larsen); the dates are in 

 August. The species is known as bred from Tinea cloacella in Tra- 

 metes gibberosa on beach and from Scardia boleti in Daedalea quercina 

 on oak; some of my specimens are likewise bred from Se. boleti in 

 Fungi on birch and poplar, the imagines came on ^^/g — ^/v, and one 

 of my specimens is labelled as bred from Hyponomeuta padella. 



