270 AMERICAN HYMKNOPTERA. 



73. Si)iracles of segment 1 strongly projecting; segment 2 has very distinct lu- 



uulie ; metasternal ridge wanting; apical member of hind tarsi hardly 

 longer than the fourth, but plainly shorter than the third. 



' Philotyinma Foer. 

 Spiracles of segment 1 not projecting; segment 2 without lunulse; marginal 

 ridge of metasternum only partly wanting; apical member of hind 

 tarsi decidedly longer than the fourth and as long as the third. 



"•■■Seopesis Foer. 



74. Segment 1 without carinate margin from spiracles to apex. 



SyndipnuN Foer. 

 Segment 1 with carina from spiracle to apex 75. 



75. Posterior median area with a middle carina 76. 



Posterior median area without a middle carina 77. 



76. Teeth of mandibles of equal length L.isti'Ot.a Foer. 



Teeth unequal, lower tooth longer *TleillOH Foer. 



77. First and second pleural areas of metathorax not separated by a transverse 



carina Polyterus Foer. 



First and second pleural areas separated by a transverse carina. 78. 



78. Front margin of clypeus with a fine, narrow elevation. . . .*Atrestes Foer. 

 Front of clypeus without elevated margin 79. 



79. Transverse median nervure uniting before the basal ; base of third discoidal 



cell twice as broad as transverse median nervure. 



■ Caiiipogeiies Foer. 

 Transverse median nervure uniting far back of basal ; base of thu'd discoidal 

 cell three times as broad as transverse median nervure. 



'-''Aselasina Foer. 



80. Metanotum entirely areolated 81. 



Metanotum not entirely areolated 84. 



81. Clypeus liatly deepened, dish-shaped, in the middle. 



-' Paiitoporthus Foer. 

 Clypeus not deepened dish-shaped in the middle 82. 



82. Terminal segment of hind tarsi longer than the third. 



'C'ainpoporus Foer. 

 Terminal segment of hind tarsi shorter than the third 83. 



83. Longer spur of hind tibise longer than half of heel segment. 



*Syntaetus Foer. 



Longer spur of hind tibiae scarcely one-third the length of heel segment; 



anteunse 26-jointed Caliplirurus Foer. 



84. Clypeus with two tooth-like projections at apex Bcetlius Foer. 



Clypeus without teeth at apex 85. 



85. Abdomen strongly compressed, long •■ Saotis Foer. 



Abdomen more or less slightly compressed at apex 86. 



86. Stigma much lengthened and pointed, longer than marginal cell. 



■ Troinopeea Foer. 

 Stigma not longer than marginal cell 87. 



87. Areolet not entirely wanting, partly open on outer nervure 88. 



Areolet entirely wanting 89. 



88. Metanotum areolated : clypeus much impressed from both sides at tip. 



Atithasus Foer. 



