Some Remarks on the Biology of the Sciornvzidae 
together with the description of a new Species of 
Ctenulus from Denmark. 
(Dipt.) 
By 
Will. Lundbeck. 
About the biology of the Sciomyzidae not much seems to be 
known. In the following I certainly do not give any important 
increase to our knowledge, I do, however, think that the commu- 
nication may be of some interest. In the well known revision of 
the Sciomyzidae by Hendel (Abhandl. k. k. zool. bot. Gesell. Wien, 
II, 1902, 9) the author records the very few facts known about 
the biology of the family: Léon Dufour (Ann. Soc. Ent. de Fr. 2 VII, 
1849, 67, Tab. III, fig. 1—8) describes larva and pupa of Tetanocera 
ferruginea Fall.; the larva was found among Lemna and Callitriche 
in a fen in the middle of November; it pupated eight days later, 
the pupa hibernated and developed in April. Gercke (Verh. Ver. 
f. nat. Unterhalt. Hamburg. III, 1876, 145) mentions eggs, larva and 
pupa of Sepedon sphegeus F., and larva and pupa of S. spinipes Scop.; 
they were found on Lemna trisulca in wet trenches (nassen Gråben), 
the eggs on the ninth of June, the larvæ in the middle of June, 
and the pupæ in August, and the development took place in late 
summer. De Meijere (Zool. Jahrbiich. Anat. und Ontog. XV, 1902, 
684) mentions larvæ and pupæ of Sepedon sphegeus among Lemna 
on the surface of water. Hendel remarks also that the metamor- 
phosis of Sciomyza crassiseta communicated by Kaltenbach probably 
belongs to some Trypetid,^) and that hitherto no development of any 
Sciomyzine was known. One case had, however, escaped the attention 
In Kat. palaarkt. Dipt. it is given with a query as synonym to Antichaeta 
atriseta Lw. 
