FAM. EMPIDID/E 183 
delicately built, without evident dorsocentrals and acrostichals, Legs slender. Wings narrow, axillar 
incision obtuse to rectangular, alule nearly wanting. 
Type species : PR. hybolina, Zetterstedt. Additional species included in this subgenus are: 
R. aterrima, Frey, limbipennis, Bez., longefilata, Str., magellensis, Bez., sphenoptera, Lw. and tumiditarsis 
Old. Allof these are palearctic except /imbipennis, which comes from South America. 
SuBcGENUS MEGACYTTARUS, BicorT 
Characters. — Males dichoptic, ocellar triangle and ocellar bristles developed; antenna not 
abnormally lengthened. Body rather robust, dorsocentrals usually weak and pluriseriate, acrostichals 
present. Abdominal hairs usually pale or brown, pygidium usually open, with filiform penis. Legs 
normal, bristles few, not pennate in female. Wings with discal cell of female often greatly enlarged, 
axillar incision obtuse to rectangular, rarely acute. 
Type species : A. limbata, Loew. Bigot erected the genus Megacyttarus on a female which he 
described as argentea. Coquillett has placed this as a synonym of /imbaía. Lw. It is to this group that 
Frey gave the subgeneric name Choreodromia. "The species are mainly characterized by the separated 
eyes of the males and the abnormally enlarged discal cell of the females. The flies are usually met 
with in an aerial dance over pools and small streams. Males are usually more abundant than the 
females, the females often being silvery in color. 
Additional species of Megacyttarus include : . anomala, Old., anomalina, Zett., anomalipennis, Meig., 
disparilis, Coq. , fulvolanata, Frey, gufitar, Frey, hirtipes, Lw., irregularis, Lw.. kamtschatica, Frey, liturata, 
Lw., maculipennis, Zett , nigripes, Fab., modipes, Fab., Paradoxa, Wahlb., scaurissima, Wh. and tefArea, 
Meig. 
SuBGENUS PARARHAMPHOMYIA, FREY 
Characters. — Males holoptic, ocellar triangle and bristles developed; antennz not greatly 
lengthened. Body of regular build, dorsocentrals usually placed in one or two rows, if pluriseriate the 
thorax is shining black, acrostichals present. Pygidium regularly open, with penis usually filiform. 
Legs rather strong, often pennate in female. Wings with discal cell normal, axillary incision obtuse 
to rectangular, rarely acute. 
Type species : R. jlunifpes, Fallen. This is the dominant group, abundantly represented in 
palearctic and nearctic regions. The following species can be assigned to Pararhamphomyia : R. albala, 
Coq., albipennis, Fall., albissima, Frey, amoena, Liw., anfractuosa, Bz., antennata, Frey, atra, Meig., barypoda, 
Coq., bifilata, Coq., bipila, Str., breviventris, Frey, brevis, Lw., candicans, Lw., caudata, Zett., chibinensis, 
Frey, cinefacta, Coq., cineracea, Coq., clavator, Coq., compta, Coq., costata, Zett., crassicauda, Str., curvula, 
Frey, debilis, Lw., dentata, Old., denlipes, Zett., dimidiata, Lw., dispar, Zett., diversipennis, Beck., effera, 
Coq., eupterota, Lw. ,fascipeunis, Zett., filata, Zett., flexuosa, Coq., fuscipennis, Zett., fuscula, Zett., galactoptera, 
Str., gibba, Fall., Ailariformis, Frey. Helleni, Frey, hirtula, Zett., impedita, liw., intermedia, Frey, kaninensis, 
Frey, leucoptera, Lw., limbata, Lw., lividiventris, Zett., longestylata, Frey, longicauda, Lw., longipes, Meig., 
lucidula, Zett., luteiventris, Lw., manca, Coq., nana, Lw., Nasoni, Coq., nitidicollis, Frey, nivetbennis, Zett., 
novecarolina, Beut., mox, Old., oscura, Zett., omissinervis, Beck., ozernajensis, Frey, jennata, Macq , 
physoprocta, Frey, blumifera, Zett., Plumifes, Fall., polita, Lw., foplitea, Wahlb., Priapulus, Liw., fseudogibba, 
Str., julchra, Lw., pusio, Lw., pusilla, Zett., rufipes, Zett., scolopacea. Say, serotina, Old., setosa, Coq., 
simplex, Zett., soccala, Lw., subglaucella, Frey, subsullans, Frey, tarsata, Meig., tenuiterfilata, Beck., tipularia, 
Fall., £runcata, Frey, wmbilicata, Lw., umbripes, Beck., unguiculata, Frey, ungulata, Lw., valga, Coq.. 
villata, Lw. and Woldstedti, Frey. : 
