78 GENERA ()I- HVMENOPTERA. 



Anteniise 9 witli tlie flagellum of ('((iial width tlirouirlioiit ; % anteiuue pu- 

 bescent or densely elotlied with short hairs; 9 al)douuMi rotund. 



Subgen. *Dirhicnus Thoni. 



Section .MICROCEXTRI. 

 Subfamily Tetr acam pin.e. 



Mesopleura not divided : % tarsi 4-joiiited ; niaruiiial vein loiitr, narrow. 



*Te<rac*aiiii»e Fonst. 

 Mesopleura divided; % tarsi .l-joiuted ; marginal vein large, black, obloug-ovate. 



*l*lat.viio<'liilus Westw. 



Subfamily ELACiiiSTiNiE. 



Abdomen with a more or less distinct petiole 2. 



Abdomen subsessile; scutellum with two dorsal impre.ssed lines; po.sterior tibiae 



with one spur 3. 



2. — Posterior tibiffi with very long spurs; vertex medially and collar acute. 



Kii|»I«'etriis Westw. 

 Posterior tibise with one or two short spurs ; jjrolhorax subconical. 

 Posterior tibise wMth one spur ; scutellum with two dorsal lines. 

 Thorax ornamented with light colors; .scutellar sutures straight. 



KteiiomoiiiiiiK We.stw. 

 Thorax not ornamented with lighter colors; body, or at least the head, 



metallic I-^lacliiNtiiK Sjiin. 



Po.sterior tibia; with two spurs; body not metallic; scutellum without 



dorsal lines Mi<»li'<»|>iM Thorn. 



3. Body winged, metallic, often ornate t"irr«»*|»ilu«» Westw. 



Body not metallic; wings short or wanting Holitlikbia Westw. 



Subfamily Elasmin^. 



Tarsi 4-jointed ; posterior coxa^ very large and strongly compressed ; head semi- 

 globose, front deeply but sjjarsely ])unctured : antennse "J, flabellate; 

 submarginal vein not broken, furnished with nuiuy bristles, jiost- 

 niarginal di.stiuct; prothorax large; mesothoracic parapsides not 

 defined or indicated only by vei\v slight grooves; alidomen with a 

 transverse smooth and conspicuous petiole ICIaf^iiiiiM Westw. 



Siihlaiiiily l-]i'i,()riii.\.K. 



Scutclluui without dor.sal lines 2. 



Scutellum with dorsal lines; futiicle and club of 9 3-jointed 9. 



2.— Antenna; inserted in middle of the face; .scape reaching far above the ocelli; 

 % antenna; with three branches; ])osterior tibiie with one sjiur. 



^ll4'llli|»tai'S<MIIIM Westw 



Anteunie inserted far lielow the middle of the face; scape reaching no higher 

 than the ocelli; po.sterior tibite usually with two sjnirs 3 



3. — Parapsidal sutures complete, but delicate 4. 



Para])sidal sutures not discernible 5. 



4. — Antenna- of % 3-braiiched ; abdomen elongate *T<'I<'«a;iiHi<* Tliom. 



Antenna- of % simple *<>liii.\ Forst. 



