308 MEMOIRS OF THE CARNEGIE MUSEUM 



Mesonotuni much shorter than the scutellum, finely deHcately shagreened or rugulose, especially ante- 

 riorly ; marginal vein a little longer than the stigmal ; flagellum subclavate, densely pubescent, the 

 funicle joints 2-6 not longer than thick, if anything a little wider than long ; eyes pubescent. 



Rhytidothorax Ashmead. 



70. Antennae inserted near the mouth border or far below the middle of the face 71 



Antennae inserted on or a little above the middle of the face. 



Frons subconvex, somewhat coarsely and closely punctate ; thorax rather coarsely shagreened 

 or finely rugulose ; scape not extending beyond ocelli ; front wings with the marginal, post- 

 marginal and stigmal veins long, subequal Tanaoneura Howard. 



Frons highly convex, smooth and polished, as is also the thorax ; scape long, extending far 

 beyond the ocelli ; front wings with the marginal, postmarginal and stigmal veins rather 

 short, the marginal thickened with a fuscous cloud or band beneath ; flagellum with six long 

 branches Hexacladia Ashmead. 



71. Antennae with the funicle 2-, 3-, 4- or 5-jointed 89 



Antennae with the funicle 6-jointed (in a single case 2-jointed). 



Metathorax bare, or with the lateral ridges superiorly alone pilose 75 



Metathorax with the pleura and the lateral ridges always clothed with a dense silvery pubes- 

 cence ; body rather robust 72 



72. Antennae unlike those of the female, filiform, pilose, or with whorls of hairs, or the funicle joints den- 



tate or subpedunculate, with Avhorls or fascicles of hairs. 73 



Antennae similar to those of the female, filiform or at most subclavate, the club conical, strongly 

 obliquely truncate from beneath, often white, the scape cylindrical, not at all dilated ; front wings 

 usually with a discoidal fuscous cloud or macula. 



Marginal vein not punctiform, although short, the stigmal and postmarginal veins long, very 



much longer than the marginal Homalotylus Mayr. 



Marginal vein punctiform, the stigmal vein long, the postmarginal vein not developed or 

 wanting Isodromus Howard. 



73. Marginal and postmarginal veins not very short, the former usually a little longer than the stigmal, 



rarely somewhat shorter. 



Thorax without white lunulae before the tegulse 74 



Thorax, with white lunulae, or at least a dot, before the tegulae Cerchysius Westwood. 



74. Hind wings, with the costal cell short and narrow. 



Antennae long ; the flagellum long, cylindrical, clothed with long, sparse hairs ; the funicle 



joints long Sceptrophorus Forster. 



Hind wings with the costal cell broad and extending as far as the booklets. . . . Echthroplexis Forster. 



75. Head with the frons prominent, the face inflexed ; antennae frequently compressed, dilated, broad ; 



front wings usually with fuscous rays or fuscous with white tips, more rarely hyaline ; sometimes 

 apterous or subapterous ; marginal vein usually somewhat thickened, oblong, very rai'ely much longer 



or much shorter than the stigmal, the postmarginal frequently wanting 83 



Head, as seen from the side, with the frons not prominent ; wings most frequently hyaline, although 

 sometimes with transverse fuscous bands or fuscous with white bands. 



Marginal vein not short, punctiform, but rarely longer than the stigmal, always more than 

 twice longer than thick, the postmarginal most frequently well developed, rarely somewhat 



shorter than the marginal 77 



Marginal vein very short, punctiform, rarely longer than thick, the stigmal from two and a half 

 to three times or more longer than the marginal ; the postmarginal wanting or very short. 



