ASHMEAD : CLASSIFICATION OF THE CHALCIU FLIES 321 



30. Occipital foramiual depression distinctly margined or rimmed 31 



Occipital foraminal depression simjile, immargined 37 



31. Metathorax at apex produced into a subgIobo.se neck, the median carina and the lateral folds usually 



present. 



Antenna^ with tiro ring-joints 32 



Antenmc with three ring-Joints. Belonura Ashinead. 



32. Eyes hairy 33 



Eyes bare, not hairy 30 



33. Postmarginal vein longer than the stigraal 34 



Postmarginal vein not longer than the stigmal, usually a little shorter 35 



34. Second abdominal segment very large Isocjrrtus Walker. 



Second abdominal segment normal ; flagellum subclavate, pubescent, the joints transverse or cjuadrate. 



Urolepis Walker. 



35. Flajielluui suliclavate or clavate, clothed with a short pubescence, (he joints usualjy much wider than 



long ; til)ia' with rigid bristles ; abdomen rotund, the second segment nut esjiecially large. 



Trichoglenes Thomson. 



30. Antenn;e filiform, pubescent ; funicle joints 4 to usually a little wider than long or not longer than 



wide Trichomalus Thomson. 



37. Metathorax at apex usually produced into a subgloboise neck ; postmarginal vein always longer than 



the stigmal 38 



Metathorax at apex normal ; postmarginal vein rarely longer than the stigmal, most fre(inently shorter 

 or of an ecpial length 4(i 



38. Legs normal, the middle tibia> not dilated 3!) 



Legs abnormal, the middle tibi;c dilated toward tips ; antenna' with the joints alternately white and 



brown ' Polyscelis Thomst)n. 



39. Pedicel long, always longer than the first joint of the funicle 40 



Pedicel shmt, never longer than the first joint of the funicle. usually much shorter, (he first joint of the 



funicle the longest of the funicle joints 41 



40. Mctathoracic spiracles small, elliptic ; abdomen short oval, ilepresscd ; llagellum filiform, pilose, the 



joints cup-shaped, transverse Endomychobius .\shnuad. 



Metathoracic spiracles oval ; abdomen boMt-sliaped ; fiagellum sublilil'orm or subclavate, pubes- 

 cent, the club always longer and ."^tduti r than the ptdicel Meraporus AValker. 



41. Antenme with two ring-joints 42 



AntenniB with three ring-joints? 



42. Metathoracic spiracles small, rounded 43 



Metathoracic spiracles not small, roumh-d 44 



43. Antenna; subclavate, pubescent ; abdonuii oblong-oval, fiat, Ix-neath at the most convex. 



Scymnophagus .Vshmead. 



44. Jlctathoracic spiracles h)ng oval or olilong, more rarely sulireuiform or linear 45 



Metathoracic .spiracles smaller, oval or broadly ii\:il. 



Metanotum very short, smooth, impunetate with a Mu<lian cariua.. .. .Epipteromalus Ashmcad. 



45. Metathoracic spiracles long-oval or oblong. 



Abdomen oblong-oval, dorstil segments 3-5 unequal, gradually increasing in length, united a little 

 longer than the .second ; fiagellum filiform, pubescent, the joints of the funicle about twice as 

 long as thick or longer Pteromalus Swcilerus. 



