ae 
148 THE ENTOMOLOGIST. 
sub-families Lestremine and Cecidomyine is there adopted. The 
forty-eight species distributed amongst six genera of Lestremine 
do not include a gall-maker, most of the larve feeding in 
rotten wood; these are related to the Mycetophiide. The sub- 
family Cecidomyine includes 458 good species, to which may be 
added five which are described but not named, and 143 whose 
economy is recorded, but the imagos are not sufficiently described. 
This makes a total of 606 species, which are included in seventeen 
genera. Sixteen new species have since been characterised. 
The economy of these numerous Cecidomyine is very varied ; 
many feed in rotten wood, some in decaying plants and bulbs, 
some under the bark of trees, a few in fungi, others in living 
plants, either in fruit organs or on leaves without any hyper- 
trophy, but the majority are true gall-gnats causing galls on 
variable parts of nearly all orders of plants: a few, however, are 
inquilines in galls formed by other species, both dipterous and 
hymenopterous, while the larva of Diplosis aphidimyza, as I have 
already remarked im these pages, feeds on various Aphides. It 
is thus seen there are several exceptions to the gall-making 
peculiarity. Owing mostly perhaps to the far too general dis- 
tribution of that great corn pest, Cecidomya tritici, the small 
apod, mostly yellow or orange, larve of the Cecidomyide are well 
known. In the gall-making species some pupate in the gall, 
while others quit it when full-fed larve, and change in the earth 
or amongst rubbish; one or two species spin a cocoon. In my 
synopsis of species I have instanced the character of their 
metamorphoses in all cases, as it is important when breeding the 
enats. Most of the larve are exceedingly lethargic in their 
movements, but a few, especially those of Diplosis loti, have an 
extraordinary saltant power. Nicholas Wagner’s three remark- 
able memoirs on the viviparous larve of certain species which 
live under the bark of trees only need mention to be referred to. 
The gall-gnat larve are preyed upon by various Hymenopterous 
parasites belonging to the families Ceraphronide, Platygas- 
teride, Mymanide, Eurytomide, Torymide, Pteromalide, Hormo- 
ceride, Encyrtide, and Tetrastichide. To refer to all the points 
of interest in the economy of the Cecidomyide, and to keep this 
article within reasonable limits, is impossible. I will therefore 
proceed with a review of our British species, giving the first 
English references to occurrence, and stating where the galls are 
