Dolichopodidae. 299 



large angulary lobe witli a long fringe, the inner part of squaniulæ 

 with short hairs. 



The chief character of the genus is the quite free, pedunculated 

 hypopygium, and further it is well distinguished by the short hind 

 metatarsus. 



The developmental stages of S. adprop in quans have been described 

 and figured by Laboulbéne (Ann. Soc. Ent. de Fr. 5, III, 1878, 49, 

 PI. V, fig. I, 1—11); the author found the iarvæ and pupæ in the 

 sap on decaying elms at Sevres in Franco; already in 1870 (BuU. 

 de la Soc. Ent. de Fr. 1870, LXX) he had given a note about the 

 breeding of this species. The larva of S. leucurus is described from 

 Germany by Beling (Arch. f. Naturgesch. 48, I, 1882, 226), who found 

 theni in a decaying beech on ^'^lu. and the imagines developed from 

 the end of May to ^/t. Further leucurus has been bred by von Heyden 

 at Frankfort on the Main (Loew, Neue Beitr. VI, 14, 2), and in England 

 by Dr. Sharp from a decaying beech on ^U and -^/r. (Verrall, Ent. Month. 

 Mag. XVI, 1905, 251), and linally by myself from a beech at Ørholm 

 in July (see below). S. adpropinquans was bred in England from an 

 elm (Verrall 1. c. 169), and it was bred in our country by Mr. Schlick 

 from a decaying tree in Dyrehaven in August (see below) ; SchoUzii 

 was bred in England from a beech fungus on ^h> (Verrall 1. c, 169): 

 tener was bred from a decaying beech in July, and finally hipartitus 

 was bred from rotten wood in July, both likewise in England 

 (Verrall 1. c. 251). The larva is yellowish white, cylindrical, narrowed 

 towards the anterior end ; the last segment has behind two large and 

 broad, approximated teeth or warts below, and two very short, 

 tubercle-shaped warts above and more forwards; below these latter 

 the very small posterior spiracles lie; the anterior spiracles are found 

 at the sides of prothorax, towards the front margin (Laboulbéne; they 

 are not mentioned by Beling); on the ventral side the abdominal 

 segments have each a transverse swelling at the front margin, beset 

 with small, chitinous hooks. The larva has a length of 5 mm {leu- 

 curus) to about 8 mm (adpropinquans). Besides the pupa described 

 by Laboulbéne I have myself examined a pupal skin of adpropinquoAis. 

 The pupa has, as usual, two triangular, approximated spines on the 

 front edge of the head at the base of the antennal sheaths. and further 

 downwards two smaller spines; between these spines are two short 

 bristles, and more above, to each side of the upper spines is a similar 

 bristle; the antennal sheaths lie on the lower side, stretching back- 



* The two organs stretching downwards, seen on Lahoulbéne's figure 9, are the 

 antennal sheaths, which is not mentioned by the author. 



