PLATYCNEMA. 229 



limpidis, halteribus fulvis apice piceis, pedibus fulvis femoribus apice 

 tarsisque fuscis. Long. 1^-1^; alar. 3 lin. 



Male. Deep black. Wings slightly brown. Halteres and legs piceous 

 or almost black. Fern. Black. Wings colourless. Halteres tawny, 

 with piceous knobs. Legs tawny ; tarsi and tips of the femora brown. 



Rare. In the collection of the Entomological Club. (E. L) 



Genus III. PLATYCNEMA. 



PLATYCNEMA, Ztt. d. s. i. 332 (1842). Empis p., Fin. Cyrtoma p., 

 Ztt. i. 1. Atelestus, Wlk. 



Ala areola discali nulla, vena prabrachiali simplici. Oculifronte con- 



tigui in utroque sexu. 



Body minute, black, soft, gibbous, pubescent. Head small, globose. 

 Eyes bare, contiguous. Proboscis declining, very short. Palpi com- 

 pressed, incumbent, very minute. Antennas small, very short ; third 

 joint oval. Costa of the wing distinctly ciliated from the base to the 

 middle ; anal areolet short ; prcebrachial vein not forked. Hind tibia and 

 hind tarsi broad. Male. Abdomen obtuse at the tip. Fern. Abdomen 

 longer, acute. 



1. pulicaria, Fin. d. s. emp. 33. 44 (1815) ; m.sylvicola, Wlk. 

 Nigro-cinerea, antennis nigris, alis cinereis, halteribus pedibusque 

 nigro-fuscis, genubus fulvis. Long. |- ; alar. 1^ lin. 



Male. Greyish -black, hairy, hardly shining. Proboscis, palpi, and 

 antenna? black ; third joint of the antenna short-conical, a little longer 

 than the preceding ; fourth about thrice the length of all the preceding. 

 Wings grey; stigma brown; veins black, dark tawny at the base. 

 Halteres blackish-brown. Legs blackish-brown, hairy ; knees tawny ; 

 hind tibia? much dilated; hind metatarsi long, dilated. 



Very rare. In the collection of the Entomological Club. (E. I.) 



Genus IV. OPETIA. 

 OPETIA, Mg. zw. vi. 357 (1830); Mq. ; Ct.; Ztt. 



Corpus parvum, elongatum, rectum, subpubescens, opacum. Color 

 niger. Proboscis subexserta. Antenna? 5 -articulate, porrecta?, 

 longitudine capitis; articulus primus subcyathiformis ; secundus 

 subovatus ; tertius fusiformis ; quartus minutus ; quintus setiformisj 

 pubescens. Thorax gibbus. Ala? incumbentes ; areola discali 

 nulla, pobrachiali et anali minutis ; vena prabrachiali furcata. Alula? 

 minima?, subovata?. Pedes subnudi, inermes, simplices ; tibia? apice 

 spinosa? ; tarsi graciles ; metatarsi postici articulo secundo fere duplo 



