NEMATOCERA. os 
Sus-Genus.—Diplosis, Lw. 
D. coniophaga, Wz. = C. oidii, Hardy (Scot. Gard., 1854, p. 170 |?)). 
The larve of this species live on the leaves of various plants, 
especially on the following: Betula, Populus, Rosa and Salix ; Bergen- 
stamm and Low also give Crrsium and Lactuca. Walker says “ they 
live with D. Ceomatis* on Ceoma miniatum, on the fallen leaves of 
Rora, and feed on that fungus.”| They feed on the spores of the 
fungi, and pupate in the ground. : 
The imago is yellow, the dorsum has three brown markings ; 
abdomen, each segment has white hairs upon the posterior margin ; 
legs brown; wings transparent, with thick gray hairs (Schiner) ; 
transverse veinlet joining the middle of the first longitudinal vein. 
2 to $ lin. | 
Tipula loti, Deg. 
Cecid. loti, Meigen. 
The larve of this species have the power of leaping well de- 
veloped; this saltatorial habit seems common to this sub-genus. 
Low remarks ‘that all such larve belong to the sub-genus 
Diplosis."t Tf this is the case, C. xigra§ belongs here. ‘The larve 
of /oti live in the flowers and in the husks of the seeds of Lotus 
corniculatus, Medicago sativa and Vicia cracca. Many larve may 
live in the same flower-head and form curious gall-like deformations. 
They pupate in the ground. 
Jmago.—Blackish-brown ; neck and scutellum dirty whitish-yellow ; 
scutellum with yellowish little hairs. Wings have a dark pubescence 
and brown veins, dorsum has two rows of whitish-yellow hairs. 
Ovipositor large, black, yellowish in parts. 
D. tremula, Wtz.—‘‘ The Aspen Gnat.” 
_ § Tipula populea, Schrank. 
| Cecid. polymorpha, Bremi. 
The larvee|| of the ‘“‘ Aspen Gnat ” seem to form two kinds of galls; 
the first are formed on the leaves of Populus tremula—these are red 
galls the size of a pea—the second kind is the well-known gall formed 
on the leaf stalk: each gall is inhabited by a single larva, which 
pupates in the ground (Winnertz). — 
Zmago.—Dorsum blackish-brown, with two rows of whitish-yellow 
* Described by Walker, but only considered a reputed species by Verrall. The 
four brown spots on the white wings easily distinguish this species from D. conio- 
D. loti, Deg. = | 
a. 
f Ins. Brit. viii., p. 106. ‘ Rora’ being a misprint evidently for Rosa. \ 
~ Mon. of N. American Diptera, Osten-Sacken, pt. i., p. 183. 
§ Vide note at end of Chap. IV. 
| Vide pl. i., fig. 2, vol. viii., Lin. Entomologica. 
