DIPTERA. — MYCETOPHILIDES. 523 
enveloped in distinct segments, applied loosely to the under side of the 
body. Guérin has observed that the mouth of this genus is furnished 
with maxilla, as well as the labrum and labium. I have confirmed 
this in the figures published by Mr. Stephens. (Idlustr. Brit. Ent. 
Haust. pl. 44. f. 1.) 
M. Macquart has reared Mycetobia pallipes from larve of the or- 
dinary form, found in the detritus of elm wood ; whilst Meigen ob- 
tained M. fasciata from larve found in Boletus versicolor. Lyonnet 
has figured the transformations of an insect which De Haan gives, 
doubtingly, as a species of Bibio; but which appears to me, especially 
from the nervures of the wings, to be a species of Mycetobia. (Rech. 
Posth. tab. 17. fig. 20—33.) The larva ( fig. 125. 14.) is very long, 
slender, and vermiform, with two very short antennz; and the pupa 
( fig. 125. 15.) is straight, and has the abdominal segments armed with 
transverse series of short reflexed spines. Guérin has figured the pupa 
of one of the species of this genus (Zeonogr. R. An. Ins. tab. 93. f. 5.). 
I have observed the transformations of several species of Molo- 
brus Latr. (Sciara Meig.), the larve and pupe of which are found 
under the bark of felled trees, or at the roots of decayed vege- 
tables; the pupa is not enclosed in a cocoon. Olivier reared three 
species of this genus from wheat (Prem. Mém. sur quelques Insectes 
qui attaquent les Céréales, 8vo, Paris, 1813, f.’7, 8, 9.). Bouché has 
also figured the larva and pupa of Molobrus vitripennis (Naturg. 
tab. 3. f. 1O—15.); the former of which agrees precisely with that of 
Mycetophila, whilst the latter differs only in the front of the head 
being cleft and the tail furnished with two divergent sete. The Ti- 
pula atomaria (De Geer, Jns. tom. vii. tab. 44. f. 27, 28.) is apterous, 
and appears to me to be most closely allied to Molobrus ; its antennze 
are rather long, 15-jointed, the joints not being filiform. Macquart 
considers it as belonging to the section Gallicoles, and St. Fargeau to 
the Terricoles, from its possessing an exserted ovipositor.* 
The genus Rhyphus (fig. 125. 16. R. fenestralis @ ), although dif- 
fering in several material respects, is also nearly allied to this subfa- 
mily, especially in the possession of ocelli ( fig. 125. 17. head of ¢ ), 
and structure of the larva (fig. 125. 18.), which Réaumur found in 
cow-dung; it is very long and cylindric, the mouth armed with two 
tentacular mandibles, and the extremity of the body with four short 
* See Mr. Haliday’s observations hereon in the Generic Synopsis. 
