322 MEMOIRS OP THE CARNEGIE MUSEUM 



Metathorafk- spiracles oblong, linear or subreniform. 



Abdomen oblong, at least 21 times as long as wide, dorsal sojinients 8-6 subequal ; flaf;elliim 



filiform, the joints of the funicle longer than thick Catolaccus Thomson. 



40. Postmarginal vein longer than the stigmal 47 



Postmarginal vein shorter than the stigmal or no longer 4I( 



47. Antenme with two ring-joints 48 



Antennte with three ring-joints. 



Metathorax short with a median carina and lateral i'olds, the latter inter.sectcd by a transverse 

 eaiina which extends from the short median carina ; the spiracles large, oblong. 



Neocatolaccus Ash mead. 



48. Metathorax with a di.stinct median carina, the lateral folds incomplete, the spiracles usually oval ; head 



large, broad, the vertex broad DiglocMs Fiirster. 



Metathorax without a median carina, tlie latei'al folds absent, the spiracles oval oi- ovate, not 

 large ;. head trausverse, not large, the temples flat Parapteromalus Ashmcad. 



49. Antennaj inserted on or near the middle of the face, or far above the clypeus 50 



Antenna; inserted far below the middle of the face or just above the clypeus. 



Head large, broad, the temples broad,. acute ; metathorax short, the lateral I'olds absent ; abdo- 

 men very short, rounded, depressed .CcElopistliia Forster. 



Head large, broad, but the temples rounded, not acute ; metathorax not very short, the lateral 

 folds complete ; abdomen oblong-oval, depressed Dibrachys Forster. 



50. Antennas subclavate, pubescent, the club much stouter than the funicle, the pe<licel much longer than 



the first joint of the funicle Metapachia We.stwood. 



Antennas filiform, pubescent or pilose, the pedicel much shorter than the first joint of the funicle; 

 funicle joints 1-4 distinctly longer than thick Arthrolytus Thomson. 



Subfamily II. Merisin.e. 



The absence of the spiracular sulci, an important character, alone distinguishes 

 this tribe ; otherwise it closely resembles the subfamily Pteromalime, its relationship 

 being quite close through the tribe Eutelmi, with the gall-inhabiting species in the 

 tribe Merisini. 



I have recognized three tribes ; the first being parasites of Coleoptera, the second 

 of Diptera, while tlie third attack Rhynchota belonging to the homopterous fam- 

 ilies AphUlidx, Aleaivdidic and Guccidx. 



TABLE OF TRIBES. 



1 . Metanotum without a trace of a median carina - 



Mctanotum with the median carina more or less distinct or at least indicated basally ; mesonotum with 



incomplete fiirrows • Tribe I. Kojitroccrini. 



2. Mesonotum with incomplete furrows Tribe II. Merisini. 



Mesonotum with complete furrows Tribe III. Isoplatini. 



TiunE I. Ropfrocerini. 

 This tribe is distinguished by the metanotum, which always has a more or less 

 distinct median carina ; or at least it is never wholly absent as in the 3Ierisini and 

 the Isojildti'ni. 



