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REPORT ON ZOOLOGY, MDCX^GXLII : 
observed by Reaumur in the nests of humble-bees, which, even as a larva, 
is specifically distinct. 
The larva of the Syrphus albostriatus has been minutely described 
by Zeller (Isis, p, 828). 
Macquart (Dipt. Exotiq.) has described a considerable number of 
extra European species, and, at the same time, characterized many new 
genera ; Miocogaster, agreeing with Ceratophya, Wd., in the form of the 
antennae, but differing by having the wing-veins and the form of body 
of Conops; the only new species, which is from the Brazils, should 
therefore be named M. conopoides (not conopsoides). Under the genus 
Megaspis, E. chrysophygus, Wd., and E. crassus, F., are separated 
from Eristalis, on account of the size of their scutellum. Plagiocera, 
differing from Eristalis, by the transverse last antennal joint, containing 
Milesia criiciger and ruftcrus, Wd., which the author considers as varieties 
of each other, and to which Mallota milesiformis, Macq., Suit, a Buff., 
belongs, is correctly removed from the Milesice and placed nearer Eris- 
talis. Dolichogyna, with one new species, D.fasciata, from Chili, much 
resembles Helophilus, but differs by the broader third antennal joint, the 
under part of face arched in its whole breadth, and particularly by the 
great length of the male organs of generation, to which the name refers. 
Imatisma (a name already used by Dejean), differing from Eristalis by 
the open marginal cells of the wings, from Helophilus by the thick cuticle 
of the middle part of the body, from Mallota and Merod.on by the form 
of the third antennal joint, &c., is formed from the Eristalis posticatuSy 
F., and includes a neAv species, said to be East Indian, I. orientalis. 
The reporter (Arch. 1842, i. p. 272) has described a new species, Eris- 
talis vesicularis, from Van Diemen’s Land, and Le Guillou (Rev. Zool. 
p. 314) another, E. splendens, from the Solomon Islands. 
CoNOPARiD^. — Zeller (Isis, p. 835) has published his observations on 
the species of this family. 
Conops soleaformis is a new species characterized by Gimmerthal 
(Bull. Mosc. p. 672). 
Von Heyden remarked, at the meeting of Naturalists at Mainz (1842), 
that the larva of Myopa lives in the body of Eucera (Amtl. Bericht, &c. 
p. 209). The particular species of Eucera which is referred to, as well 
as of Myopa, is not stated. 
CEstracida3. — Some observations on the (Estridee have been made by 
Sells, in the Transact. Ent. Soc. iii. p. 72. He does not assent to the 
assertion of Clark, that the effect of the larvae of Gasterophilus is salu- 
tary; on the contrary, when present in abundance, they destroy the 
health of horses ; and in two cases of horses, which had died suddenly, 
the coats of the stomach were found, on dissection, to be perforated by 
these larvae. Farther observations (p. 76) are given on (Estrus hovis, 
to which, as a synonyme, (E. ericetorum, Leach, belongs. 
298 
