204 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxm. 



Prothorax .Mubtruncate behind; niiildkf l()])e of mesonotum not much longer than 

 broad, and separated from the scutellum by a deep fovea; costal 

 iiervure toward apex neither thickened nor clavate, the cubitus 

 originating from the Imsal nervure; costal cell usually ^mth an 

 intercostal vein, rarely without {Megalodontinse); scape of antennae 

 long or rather long. 



Head transverse, the temples not very broad; third joint of antenna' very 

 long, three or four times longer than the long scape; abdomen 

 subdepressed, the ovipositor more or less exserted. 



Family LXXXIV. Xyelid.e. 



Head quadrate, the temples very broad, third joint of antennae rarely nuich 

 longer than the scape; abdomen miich depressed, the ovipositor 

 hidden Family LXXXV. Lydid^. 



2. Basal nervure in front wings usually uniting with the subcostal vein far from the 



origin of the cubitus; basal plates of first abdominal segment usually 

 closely united, rarely showing a slight median emargination at apex; 

 if deeply emarginate, the sides of the abdomen acutely margined, 



while the antennse are clavate 7 



Basal nervure in front wings usually uniting with the base of the cubitus or with 

 the subcostal very near its base; basal plates of first abdominal 

 segment most frequently not united, medially slit or with a wedge- 

 shaped or broadly triangular emargination, sides of abdomen 

 rounded, never acutely margined. 



Front wings with two cubital cells - 6 



Front wings with one cubital cell 3 



3. Front wings without a lanceolate cell 5 



Front wings with a lanceolate cell. 



Antenna; 9 to 25 jointed 4 



Antennae 3-jointed. 



Hind wings with an anal cell; tibite usually with lateral spurs; antenuje 

 in female with the third joint very long, subclavate or filiform, 

 densely hairy, in male most frequently forked. 



Family LXXXVI. HYLOTOMrn^E. 



4. Hind wings with an anal cell ; female antennre usually serrate or subserrate, male 



antennfe ramose or biramose Family LXXXVII. Lophyrid^e. 



Hind wings without an anal cell; female antennae most frequently subclavate or 

 filiform, male antenna? usually ramose or filiform. 



Family LXXXVIII. Perreyiid.e. 



5. Hind wings without an anal cell; antennre 6 to 25 jointed, in female clavate or 



subclavate, more rarely filiform, in male ramose or simple, filiform, 

 multiarticulate Family LXXXIX. PTERYGOPHORiDiE. 



6. Body rather short, oviform, the abdomen not long; scape small, scarcely longer 



than thick, not or only a little larger than the pedicel (except in 

 the BlaMicotominx, which has, however, only 4-jointed antennae); 

 antenna' 4 to 15 jointed; head, seen from above, not quadrate, the 

 occiput more deeply concave, the temples not so broad, more 

 rounded behind, while there is no distinct furrow or depression 

 between the antennae and eyes, or so slight as to be scarcely notice- 

 able Family XC. Selandriid^. 



Body elongate, the abdomen usually long, narrow, and subcylindrical; scape 

 rather large, usually thrice as long as thick, or about four times 

 larger than the pedicel; antennas 9-jointed; head, seen from above, 

 (juadrate, the temples very broad and with a furrow, channel, or 



