146 Descriptions of British Diptera. 



English and Irish Diptera, and again earnestly request additional 

 information respecting Species and Localities, which will either be 

 introduced in the proper places, or added as supplements to the 

 parts which may be previously published. — The species which have 

 been found in Scotland are distinguished by a small s. after the 

 specific name. — The next paper will include the Tabanidce. — Eds. ) 



ORDER DIPTERA, 

 Family STRATIOMYD^, Latr. 

 The family group of two- winged flies, distinguished by the above 

 name, have the antennae porrect, approximating at the base, and 

 composed of three joints, the third, or terminal joint, divided into 

 rings by means of faintly marked incisures. These organs are ge- 

 nerally furnished with a style or an elongate seta at the extremity. 

 The proboscis is short, the labella alone being exserted. The ocelli 

 are three in number, and placed in the form of a triangle usually on 

 the crown : abdomen oval, generally wider than the head, and flat or 

 slightly convex, composed of five segments; wings when at rest over- 

 lapping each other, and lying along the back of the abdomen, leaving 

 the sides of it exposed, and projecting beyond the apex. The typi- 

 cal genera are rather of obscure colours, having the sides of the body 

 ornamented with light-coloured spots and abbreviated bands. The 

 species frequent marshy places, and the larvae, in most instances, 

 are aquatic. The indigenous genera admit of being distinguished 

 by the following concise external characters : 



i r 



I „- ™ thout ? te . rmmal l 1 st joint much longer than the 2d Stratiomys. 



§8 



2 



E=3 



style, or having on 



lya veryshortone ; ) lst and 2d J ° intS nearly equal Odontomyia. 



with an elongate } 3d joint 4-ringed Oxycera. 



style; j 5-ringed Clitellaria. 



Scutellum un- ") ,. , 7 abdomen somewhat globular Pachygaster. 



armed; 3d / orblcular ;J oblong Sargus. 



joint of the C ovate Chloromyia. 



antennae J subfusiform Nemotelus. 



Genus STRATIOMYS, Geoff roy. 

 Antennae rather longer than the head, directed forwards, approxi- 

 mating at the base, the third joint diverging obliquely ; the first 

 joint elongate and cylindrical, the second short and cup-shaped, the 

 third very long, subfusiform, divided into five distinct rings, and 

 without a terminal seta, (Fig. 1 :) proboscis short ; the labrum li- 

 near, corneous, notched in front ; (Fig. 2 b;) palpi three-jointed, 



