534 Lisecta. Pterodlccra. 



infra geniciilala, tnni ponecla , hU capilnlo pnrvo et labiis 

 formalo, illis arliciilo eloiigalo , snbtiis inflevo , labiis longis- 

 siniis , rmcarilMis, sccns et parliin sallem forinalo , lerminata. 

 Haustellurn selis duabiis ; sup(U'a compressa , crassiore, cyliu- 

 drico-acnmiiiala , infra iinicaualiculala inferamque a aginaute ; 

 liac tennissiina, aciculaii , gracillima, longiludine varia. Palpi 

 cum exlanl proboscidi, geniculum inferura veisns, inserti, bre- 

 vcs , filirormes , aut subexlrorsnm crassiores et. ad apicem ro- 

 tuudali, erecti, pilosi aut villosi, in cavilale orali inclusi, ultra 

 basin inarliculali. 



Corpus plerumque longum , snbcylindricum , in nounuUIs 

 breve et Musceb doincsticre habilum ref.rens. Caput cute mem- 

 branacea , albida , anlice priPserlim , veslilum , ( iu plnrimis 

 qnasi vcsiculoso-larvalum) iboracisallilndine, A/shemisplia^rico- 

 trigonum , crassum, tliorace paulo lalius , illis coinpresso-sub- 

 hemispbaericnin ; facie lougiiroisum bisulcnla; froiite sa^pius 

 producla ; ornlis hUeralilins, o\alis anl snliovalihns , inUgris ; 

 ocellis modo nuUis , niotlo exlnnlibns el tnnc niiiiimis, ^alde 

 approsimalis y verlici imposilis. Truncus hre^iler cylindricus, 

 anlice recla transverse Iruncalus, augnlis anlicis prominulis, 

 tubcrculiformibus. Halteres in pluiimis suhnndi. ^bdumen 

 tum elongatum , basin versns panlalim altennalnm , ad apiceni 

 incrassaUim aul suhc!a\ aluin , hamalo-iiicurvnm , appentlicihus, 

 nncinulis aui dcnl ilms ^ ariis, proniiupulihus, inslruclnm 5 luni 

 breve , depresso- Irigonum. Pedes niodo hrexiorcs, crassiorcs , 

 glabriusculi;modoloiigiores, graciliorcs, [)ilosi aut bispiduli ; larsi 

 omnium pulvillis duohus,elongalis. ^/«T' sa-pins incumhenles, ut 

 in syrphiis fere reticulalae ; cellulae discoidales paulum diversne; 

 interua minima; externa nervospnrio noii secata ; ce.llula analis 

 ad apicem longius pcliolala, in noiinullis luinima ; cellnla se— 

 cunda limbi poslici are» inlermedias a terlia ejusdem limbi dis- 

 tincla seu nervo produclo dlscrela. 



/. Antenncc ( capitis faciei non incuinhentes , erectce , 

 porrecta^, ad articulum secundum subgeniculatce\. 



