26 DUEHAM DIPTERA. 



ANALYTICAL TABLE OF FAMILIES. 



Verrall's list of British Diptera begins with 30 species of Pulicidcz 

 (Fleas), of which I take no account. (For numbering see page 6). 



1 (141). Body not horny, head free, proboscis and palpi 



present, claws moderate. Perfect insect not para- 

 sitic on warm blooded animals. 

 *1£ (52£). Frontal lunule absent. 



ORTHORRHAPHA. 



Flies which escape through a T-shaped opening in the back 

 of the larval skin (VI. 38). Pupa indicating the outlines of 

 the imago (VI. 39). Adults without a frontal lunule. 



2 (25). Antennae many jointed and generally long (Plate II.). 



NEMATOCERA. 



8 (4). Vein-endings, counting round the margin of the wing, 



not more than six (IV. 1, 2, 3). 



CeCIDOMYIDjE (II.) 



4 (8). Vein-endings, counting round the margin of the wing, 



more than six. 



5 (20). Thorax without any strong cross- seam (VI. 31). 



6 (15). Costa ending at the apex of the wing (IV. 4-1 1). 



7 (12). Ocelli present, three in a triangle, or in a line, or two 



lying on the inner edges of the eyes (VI. 1, and 



II. 4). 



8 (9). O. (discal cell) present (IV. 16). Rhyphid^e (XIV.) 



9 (8). O. absent (IV. 4-7). 



10 (11). Antennae long and rather slender (II. 3-6), or if short 



then the coxae much elongated. 



Mycetophilidje (III.) 



11 (10). Antennae short and thick (II. 7, 8). Coxae not 



elongated. Bibionice (IV.) 



12 (7). Ocelli absent. 



13 (14). Antennae shorter than the thorax (II. 9). Wings 



very broad (IV. 8). Simulid^e (V.) 



* The paragraphs with fractions may be disregarded, being inserted merely to 

 indicate the Snb-ord^rs. 



