Ceromasia. 291 



and sparingly hairy), Epistoma retreating, slightly reflected just 

 below. Antennæ inserted well above middle of the eye, third joint 

 foiir to five times as long as second; arista with second joint short 

 or a little elongated. Thorax about quadratic; four postsutural 

 dorsocentrals, and three præ- and three postsutural acrostichals; 

 a præsutural intraalar bristle. Scutellum with four marginal bristles 

 on each side, the apical crossing. Three or four sternopleural bristles. 

 Abdomen elongated ovate; excavation on second segment reaching 

 hind margin; there are discai and marginal bristles, second segment 

 with a pair of marginal; fifth with bristles all over. In some species 

 third and fourtli segment in male with a patch of short dense hairs 

 ventrally on each side. Legs with strong bristles; anterodorsal bristles 

 on hind tibiæ quite unequal ; claws and pulvilli in male not or a little 

 elongated; front tarsi in female simple. Wings with first posterior 

 ceH more or less narrowly open, sometimes nearly closed, ending 

 a little before apex of wing or in some distance from it; a small costal 

 spine. 



The biology of the species is not well known; those which have 

 been bred are parasitic on Lymantria monacha (ferruginea), on species 

 oi Lophyrus {inclusa non Danish), and rutila (non Danish) is recorded 

 as parasitic on Forficula and to belong to Pantel's group 2. The female 

 of inclusa has on the ventral side fourth abdominal segment with 

 the lateral margins raised and compressed and beset with short 

 spine-like bristles as in Lydella nigripes, and may therefore be thought 

 to belong to Pantel's group 7. 



The genus comprises perhaps 6 European species, three have 

 been found in Denmark. It is divided into some subgenera of which 

 only two Ceromasia s. str. {ferruginea, florum) and Paraphorocera B. B. 

 {senilis) are represented in Denmark. The above generic description 

 only refers to these. The two other subgenera, Lophyromyia B. B. 

 (inclusa) with three postsutural dorsocentrals, and Thelyconychia 

 B. B. have the eyes sparingly haired. 



Table of Species. 



1. Three sternopleural bristles (in florum may be a weak 

 foiirth); all yellow or grey pruinose species 2. 



— Four sternopleural bristles (generally); species black with 

 whitish pruinosity, on abdomen as bands shifting with 

 dark according to view 3. senilis. 



2. Brownish yellow pruinose; frontal bristles descending to 



19* 



