Pyrophaena. 223 



long wings; also the large ocellar triangle and the short-haired hind 

 femora without the usual longer hairs on the anterior side are sonie- 

 what characteristic. 



With regard to the developmental stages Hennecke has mentioned 

 the development of P. rosarum {Syrphus rosaé) (Ber, naturw. Ver. 

 Harzes, IV, 1845, 40) but I have not seen this paper. I have myself 

 examined larvæ and pupæ of P. granditarsa and a pupa of rosaruni. 

 The larva resembles that of Plalychirus both in shape and colour, 

 only it is, I think, a little broader; the dermis is likewise chagreened 

 and corrugated, and there are the same sv^'ellings below; the small 

 bristles which are placed quite as in Platychirus, are stronger and 

 more conspicuous. There are distinct mouth hooks and small, brown 

 or black anterior spiracular tubercles on prothorax. The posterior 

 spiracular process is very low, almost not protruding, only forming a 

 transversely oval wart, and by this character the larva may be known 

 from the larva of Platychirus. When fuU grown the larva has a 

 length of about 10 mm. The pupa is yellow, but the empty puparium 

 pale yellowish or whitish; it also quite resembles the pupa of Platy- 

 chirus, but may likewise be known by the low posterior spiracular 

 process and more conspicuous spinules; it has likewise very small, 

 scarcely detectible anterior spiracular tubes, though they are slightly 

 larger than in Platychirus; the pupa has a length of about 7 mm. 



The larva lives in the same way as that of Platychirus; it has 

 been taken in flood refuse in fens in February and April, and the 

 pupa (of granditarsa) in July; a larva of granditarsa taken on ^h 

 pupated on ^^,'4 and the imago came ^Vs; other larvæ of the same 

 species taken in April developed in May and June ; the larva of rosaruni 

 was taken on ^^U, it developed on ^^/s. The larva thus hibernates 

 and pupates in spring; it is no doubt carnivorous either feeding on 

 Aphides or in some other way. 



The species of Pyrophaena occur in fens and on meadows in the 

 same way as Platychirus, often near water. 



Of the genus three species are known from the palæarctic region 

 (and there seem in all to be no more); two of them occur in Den- 

 mark, the third is only known from Siberia. 



Table of Species. 



Abdomen reddish orange except at base and tip ; anterior 



tarsi quite or mainly black, remarkably dilated in the male 1. granditarsa. 



Abdomen with only a pair of spots or a band on third 



segment; anterior tarsi yellow, simple in the male 2. rosaruni. 



