198 AMERICAN HYMENOPTERA. 



meso- and shortening of the pro- and metathorax ; the metathorax 

 is depressed and flat to fit the basal segment of the abdomen ; with- 

 out distinct areolet. Head comparatively small, much narrower 

 than thorax and set low on it ; maxillary palpi with the second seg- 

 ment not greatly enlarged ; antennae small at base, strongly subcla- 

 vate ; 9 with the large geniculate ovipositor exserted and longer 

 than the body. 



Cultrarius rileyi Marl. \Metopius), Proc. Ent. Soc. Wash., 104. 



9 . — 10 mm. Black, with the foUowiug parts marked with yellow : two short 

 orbital Hues opposite antennae, spot between, spot beneath tegulse, apical third of 

 scutellum, two spots on each side of metathorax, the larger and outer one being 

 just above the hind coxffi, four anterior tibia;, apex of all the femora and apical 

 margin of all the abdominal segments; remainder of legs and base of antennae 

 pale piceous; wings hyaline, with costal margin dusky, deepening toward the 

 apex ; facial shield coarsely, but sparsely punctured and very small margin ; 

 labrum and lower part of shield sometimes glabrous. 



% . — Unknown. 



Six specimens from So. Dakota and Kansas (coll. U. S. Nat. Mus.). 



METOFIUS Panzier. 

 (Kritsch. Revis., ii, 79, 1806.) 



Characterized by having the basal segment of the abdomen above 

 oval, or elevated pyramidal ; by having a median and two lateral 

 basal areas distinct on the oval metathorax, the lateral areas being 

 more or less glabrous ; by the second segment of the maxillary palpi 

 being large and globular in the 9 and enlarged in % ; ovipositor 

 small, rarely visible. 



The species may be separated as follows : 



Facial shield with distinct, vertical, median carina. 



Four posterior legs black and yellow; abdominal segments 2, 6 and 7 not mar- 

 gined with yellow iiltiniatiis n. sp. 



Four posterior legs rufous; all the abdominal segments broadly margined with 



yellow rufipes Cress. 



Facial shield without distinct median carina. 



Thorax and abdomen beyond segment two black, immaculate; wings fuligi- 

 nous basalis Cress. 



Thorax black or piceous, with yellow markings. 



Abdomen with the apical segments entirely black, or narrowly yellow at 

 apex. 

 Segment two entirely black, or with yellow dots in apical corners. 



Wings hyaline, except a smoky patch on marginal and upper part of 

 submarginal cells; basal segment of abdomen oval. 



errant ia n. sp. 

 Wings fusco-hyaline. or yellowish hyaline throughout. 



