i: ol Bee ee y 
NEMATOCERA. 89 
so pale. 9 resembles 4, only the antennz are 21-22-jointed. 
Ovipositor yellowish-white; long; no lamelle. After death the 
colours turn browner and the white hairs less silvery. PI. ii. (2). 
L. albipennis, Mg. 
The larve live between the scales of the galls produced by C. 
rosaria on Salix alba. 
J/mago.—Deep black ; wings limpid and hairy, gray at the tips, 
with veins and cilia black ; a small white spot is present at the tip 
of the first longitudinal vein, on the costa. .Legs piceous, stout 
moderately long.* 
L. stygia, Mg. 
This is a brownish species, yellowish on the ventral surface ; black 
antennz ; densely pubescent dark-gray wings. Legs long and stout, 
white in certain lights. Metatarsus longer than any of the following 
joints. Life history unknown. 
L. obfuscata, Mg. = Cecidomyia obfuscata, Walker (p. 86). 
Testaceous ; black head and antenne. Thorax brownish. Legs 
as in species above, but with brown bands on the tibiz and tarsi. 
Walker says the larvee have been observed by Kaltenbach to feed on 
the thistle. 
L. fuliginosa, Steph. 
Habits unknown. Recorded in Stephen’s “ Illustrations of British 
Entomology,” 1846 (p. 42, Fig. 4). 
L. pusilla, Mg., and berberina, Schrk., are two reputed species in 
the English fauna. 
The family just passed over in this chapter is seen to be one of 
great importance, on account of its containing so many insects that 
are injurious to plant life, especially two (C. destructor and D. tritict) ; 
many of the others are injurious in a less extent. Considering, then, 
the destruction caused by these small and insignificant-looking flies, 
it is strange that they have passed unnoticed so much in England ; 
scarcely any local lists contain more than one or two species out of 
the great number already recorded in Britain. Dale, for instance, 
only records C. ¢ritic’ from W. Cornwall; only three or four are 
* Sys. Besch. der b.e.z., Insekten, A. 1818, T. i., p. 89, pl. iii., fig. 5. 
