252 
REPORT ON ZOOLOGY, MDCCCXLII : 
that the length of the proboscis in Empis and Rhamphomyia, cannot, 
as is often done by Meigen, be referred to difference of sex, as the 
membranous sheath, which surrounds the opening of the mouth, some- 
times bulges out in the struggles of death, by which the proboscis- is 
unnaturally lengthened. 
Dolichopid^. — An excellent monograph on the Danish DolicJiopidce 
has been undertaken by Stager. The first part only has at present 
appeared (Kroyer Naturh. Tidsskr. iv. p. 1), embracing the D. lamelli- 
feri, with leaf-like appendages to the male organs of generation. The 
author, in this work, has brought to light, and taken as a foundation, the 
admirable treatise of Stannius (Isis, 1831). Syhistroma (three species) 
and Ammdbates (three species) are each enriched with one, and Doli- 
chopus (forty-one species) with nine new species. He has given a plan 
for dividing the Dolichopidce with filiform appendages to the male 
organs of generation (ibid. p. 340), which, as the genera are grouped 
according to the antennal bristles, corresponds, in general, with the divi- 
sion of Macquart ; however, it is more carefully elaborated, and he has 
better sifted the genera, Argyra and Porphyrops especially. It is to be 
hoped the author will soon publish the remainder of this plan in the 
second part of his monograph. 
Zeller (Isis, p. 831) has made some remarks on different Dolichopidce. 
He has given the name Sciapus to the genus Psilopus, Meig., as Psilopus 
and Psilopa cannot well stand next each other. Four species have been 
more minutely examined by him ; the $ of Syhistroma nodicornis, Mg., 
is described, and a new species, Dolichopus pectinifer. 
Macquart (Dipt. Exotiq.) has described a series of new extra European 
species of this family, of the genera Psilopus and Dolichopus. The 
reporter (Arch. 1842, i, p. 273) has also made known a new species from 
Van Diemen’s Land, Psilopus ingenuus. 
Stratiomyd^. — Macquart (Ann. d. Soc. Ent. d. Fr. p. 41, t. 4, f. 2) 
has characterized a new genus, which has, in common with Beris, the 
eight-ringed third antennal joint, and with Stratiomys the long first 
antennal joint and double- spined scutellum, but is distinguished by the 
under part of face forming a strong projection, which receives the pro- 
boscis in an emargination ; hence its name, Exochostoma. The only 
species, E. nitida, black, with yellow tibiae, blackish wings, 2f'" long, 
has been discovered in France. 
Zeller (Isis, p. 825) has described a new species of Sargus from 
Hungary, S. melampogon, nearly approximating the S. formosus, Schr., 
but distinguished by the black beard and blackish wings. 
Zetterstedt (Dipt. Scand.) has described the following new species : — 
Stratiomys ruficornis, chiefly distinguished from St. hydropota by the 
red antennae, black only at the extremest tip ; Nemotelus notatus ; 
Pachy g aster tar salis ; Chrysomyia cyaniventris ; Sargus nubeculoms^ 
296 
