320 MEMOIRS OP THE CARNEGIE MUSEUM 



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



6 and 7 longer; venter subconvex or convex. Pteromalus Swederus (type Ichneumon puparum Linne). 



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



than the third, those beyond variable, subequal in length ; venter usually strongly compi-essed or 



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



20 . Marginal vein longer than the stigmal ; metathoracic spiracles usually oblong-oval, close 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 Thorns.). 

 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 N. dysaulus Walk.). 



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



Postmarginal vein shorter 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 apex Neocatolaccus Ashmead. 



(type Catolaccus tylodermse Ashm.). 



24. Pedicel shorter than the first 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.). 



26. Metanotum usually with a distinct median cai'iua, the lateral folds incomplete, indicated toward the 



base, the spiracles oval or elliptic. 



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



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



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



joint of the funicle 28 



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

 joint of the funicle. 



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



Coelopisthia Forster (type Pteromalus cephalotes Walk.). 



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



Antennae inserted far below the middle of the face. 



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



Dibrachys Forster (type Pteromalus boucheanus Ratz.). 



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



(type A. punctatus Thoms.). 

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



Metapachia Westw. (partim). 



