Trupheoneura. 127 



spiracles, The fullgrown larva has a length of aboiit 5 mm. As seen 

 from the above the larva is very similar to Keilins' description of 

 A. rufipes^ the papillæ being present in the same niimber and distri- 

 bution and no doubt also here bearing sensory organs, but it difYers 

 by the relatively large teeth which cover the surface, and by the 

 segments being distinctly divided into three corrugations ; the ventral 

 prominences are no doubt homologous to those mentioned by Keilin, 

 and likewise they quite answer to the description given by Perris 

 of A. pusilla (Ann. Soc. ent. de Fr. 4, X, 354). The pupa is likewise 

 similar to that of A. rufipes and of the same typical shape, the ventral 

 surface is arched from side to side, the dorsal more flat, the greatest 

 height lies at the anterior third, from here sloping abruptly towards 

 the head end and more evenly towards the posterior end; the surface 

 is granulated from the larval teeth; the papillæ are only slightly 

 visible, except those round the posterior end. The anterior spiracular 

 tubes are of medium length, pointed, they are rather distant, not 

 directed forwards but to each side. The colour of the pupa is brown; 

 the length fully 3 mm. 



As seen from the above the larvæ feed on carrion, for no doubt 

 the imagines are present there for depositing the eggs, but they seem 

 upon the whole to feed on decaying animal and vegetable matters, 

 as species have been got from dead caterpillars, from nests of Vespa^ 

 and also have been taken on rotten fungi. Not few species seem to 

 occur in autumn or even vinter, but some, as f. inst. intermedia, 

 exclusively occur in spring and some may be taken in summer. As 

 regards hibernation those species which occur in spring no doubt 

 hibernate as pupa, but the autumn species perhaps hibernate as larva. 



Of the genus about 25 species are known from the palæarctic 

 region; 12 have been found in Denmark. 



Table of Species. 



1. Scutellum with four bristles, the anterior often smaller 



than the posterior 2. 



— Scutellum with two bristles 7. 



2. Scutellar bristles equal or nearly 3. 



— Scutellar bristles unequal 4. 



3. Antennæ with the third joint very large, almost as 

 large as the eye; abdomen in male with second and 

 sixth segments elongated, and hypopygium large, 

 black and shining wnth arms of forceps very unsym- 



