320 MEMOIRS OF THE CARNEGIE MUSEUM 



19. Second abdominal segment about twice as long as the third or a little longer, segments 3-5 subequal, 



6 and? longer; venter subconvex or convex. Pteromalus Swedenis (type Ichneumon puparum Linue). 



Second abdominal segment about three times as long as the third, segments 4 and 5 united not longer 



than the third, those beyond variable, sube(iual in length ; venter usually strongly compressed or 



keeled Hypopteromalus Ashraead, g. nov. (type Pteromalus tabacum Fitch). 



20 . Marginal vein longer than the .stigmal ; metathoracic spiracles usually oblong-oval, clo.se to the post- 

 scutellar fold ; funicle joints longer than thick, usually about twice as long as thick or nearly ; abdo- 

 men not strongly carinate beneath towards base. . . .Catolaccus Thomson (type C. cavigena Thoms.). 

 Marginal vein only a little longer than the stigmal ; metathoracic spiracles small, short oval or sub- 

 rotund ; funicle joints very little longer than thick ; abdomen strongly carinate beneath towards 

 base (■?) Norbanus Walker (type A', dysaxdm Walk.). 



21. Postmarginal vein longer than the .stigmal vein, but rarely a great deal longer 22 



Postmarginal vein s/iorfer than the stigmal vein, or of an equal length ; pedicel small, usually much 



shorter than the first joint of the funicle ; in a single case only is it much longer 27 



22. Antennae with three ring-joints. 23 



Antennae with two ring-joints 24 



23. Metanotum very short, with a median carina and lateral folds, the latter intersected by a transverse 



carina or fold that extends on each side from the median carina ; spiracles large, oblong ; abdomen 



conic-ovate and somewhat produced at aptx Neocatolaccus Ashmead. 



(type Catolaccus tylodermx Ashm.). 



24. Pedicel shorter than the lirst joint of the funicle 25 



Pedicel longer than the first joint of the funicle 26 



25. Metanotum with a median carina and lateral folds, the spiracles usually large, long oval or linear ; 



abdomen conic-ovate, keeled beneath; postmarginal vein not or only a little longer than the stigmal. 



Metapachia Westwood (type M. dispar Westw.). 



Metanotum with a median carina, the lateral folds wanting, the spiracles oval, not large ; abdomen 



ovate, subcompressed beneath ; postmarginal vein very long . . . Parapteromalus Ashmead, g. nov. 



(type P. Isosomatis Ashm.). 

 2G. Metanotum usually with a distinct median carina, the lateral folds incomplete, indicated toward the 

 base, the spiracles oval or ellijitic. 



Abdomen conic-ovate Hypopteromalus Ashmead (type P. tabacum Fitch). 



Abdomen rotund Diglochis Forster (type Pteromalus omnivorus Walk.). 



27. Head wide, but the temples and clieeks rounded, not especially broad ; pedicel shorter than the firet 



joint of the funicle 28 



Head large, broad, the temples and the cheeks broad, acute ; pedicel long, much longer than the first 

 joint of the funicle. 



Antennae inserted just above the clypeus ; abdomen rotund, wider than the thorax, rarely ovate. 

 Coelopisthia Forster (type Pteromalus ccphalotes Walk.). 



28. Antennae inserted on or very near the middle of the face, never far below the middle 29 



Antennfe inserted far below the middle of the face. 



Metathorax not very short ; abdomen ovate or conic-ovate, usually convex beneath. 



Dibrachys Forster (type Pteromalus bovcheanus Ratz.). 



29. Abdomen conic-ovate, not much produced beneath, if at all Arthrolytus Thomson. 



(type A. ])unctatus Thoms.). 

 Abdomen conic-ovate, but beneath towards base, acutely triangularly produced. 



Metapachia Westw. (partim). 



