118 



EMPIDJ5. 



alls limpidis, abdomine piceo, pedibus flavis, tibiis posticis apice tarsisque 

 obscurioribus. Long. 2 ; alar. 4f lin. 



Black. Thorax very shining. Wings colourless ; veins tawny. 

 Halteres yellow. Abdomen piceous. Legs yellow ; hind tibiae towards 

 the tips and tarsi rather darker. Perhaps the male of L. rufaollis. 



Rare. In Mr. Haliday's collection. (I.) 



Genus XV. OCYDROMIA. 



OCYDROMIA, Hms. ; Mg. zw. ii. 351 (1820) ; Mq. ; Ztt. Tachydro- 

 mia p., Fb. Empis p., Fin. 



Corpus parvum, glabriculuni, nitidum, subincurvum. Color niger aut 

 rufo-testaceus. Oculi rufo-fusci, parum seneo-micantes, in utroque 

 sexu connexi. Proboscis brevissima, subocculta. Antennae 4-arti- 

 culataB ; articulus tertius ovatus ; quartus setiforinis, snbdorsalis. 

 Alarum vena cubitalis simplex ; vena externo-medice 2 ; areola discoi- 

 dalis una. ' Pedes aut omnes simplices, aut postici raro tibiis apicem 

 versus incrassatis ; tibiis anticis latere interiore prope basin denti- 

 culo minuto semper armatis ; coxa femoribus breviores. 

 Mas. Corpus obscurius, gracilius ; anus obtusus. 

 Foem. Corpus pallidius, robustius ; anus acutior. Oviductus occultus. 

 Body small, black or reddish-testaceous, smooth, shining, slightly 

 incurved. Head round ; epistoma extremely narrow. Eyes large. 

 Ocelli 3, on the crown. Proboscis very short, almost horizontal. 

 Palpi small, cylindrical, hairy, obtuse. Antennas 4-jointed, porrect, 

 shorter than the head, closely approximate at the base, diverging 

 upward ; first and second joints almost cylindrical, beset with short 

 bristles ; third joint oval ; fourth setifonn, seated on the tldrd near the 

 tip. Thorax oval, gibbous, depressed on the hinder part of the back, 

 hardly bristly, without a suture; scutellum narrow. Wings longer 

 than the abdomen, incumbent and parallel in repose, rounded at the 

 tips, finely ciliated, very finely pubescent ; cubital vein simple ; externo- 

 medial veins 2 ; discal areolet one. Halteres uncovered. Abdomen 

 pubescent, compressed, incurved. Legs simple, slender, pubescent ; 

 coxa shorter than the femora ; hind legs somewhat longer than the 

 anterior ; first joint of the tarsi almost as long as all the 4 following. 

 Male. Eyes parted by a suture. 

 Fern. Eyes parted by a very narrow interval. 

 The Ocydromia appear from the spring to the autumn, and 

 inhabit meadows, flowers, the leaves of shrubs, and especially 

 woods ; they are agile, but their flight is slow. 



1. glabricula, Mn. d. s. emp. 33. 42 (1815) ; Mg. ; Mq. ; Ztt. 

 nigripennis, Fb. Mas. ^neo- eel purpureo-niyra, auteimis nigris, alis 





