238 AMERICAN HYMENOPTEKA. 



brown ; cubito-discoidal vein not broken : mesotborax finely punctured, scutellum 

 coarsely punctured ; metatborax sbiniug at base, and on pleura, except above 

 hind coxae where it is coarsely punctured ; apex of metatborax scabrous; abdo- 

 men slender, shining, finely punctured ; basal half of second segment coarsely 

 punctured ; petiole slightly broadened toward apex, cai-inate ; spiracles not raised. 



Two specimens from Wasliington and Colorado (.type, coll. Amer. 

 Ent. Soc. and G. C. D. ). 



Exyston boreolis n. sp. 



9 % ■ — 8 mm. Black, with face, mouth-parts, cheeks beneath, orbital lines 

 each side of antennse. tegul^e, prosternum, apex of scutellums. four anterior coxae, 

 all trochanters and apical margins of abdominal segments 3 and following, narrow 

 on 3 and 4, half of 5 and most of 6 and 7. yellow ; femora rufous, posterior pair 

 and tibiff black at base and apex ; posterior tarsi dusky, remainder of four ante- 

 rior legs ferruginous; antennae rufous, dark at base; abdomen more or less rufous 

 on segments 2-4; wings hyaline, uervures and stigma reddish brown; cubito- 

 discoidal vein broken ; face, scutellum and metatborax at apex, coarsely punc- 

 tured ; pleurae shining, punctured ; abdomen clavate. pilose, finely punctured ; 

 petiole broad, carinate; ovipositor of $> exserted, 1 mm. long. 



Male from Colorado, female from " Hudson Bay Territory" (types, 

 coll. Amer. Eut. Soc. and G. C. D.). 



Exy>«toii clavatiis Cress. (Ctenisciis), Proc. Acad. Nat. Sci. Phila. iii. 284. 

 E. abdominalis Ashm., Trans. Amer. Eat. Soc. xxiii, 197. 

 % . — 7-9 mm. Head and thorax black, with face, mouth-parts, tegulae and 

 apex of scutellums yellow; antennae fulvous black at base; abdomen rufous, 

 black on segment 1 and at base of 2, also usually black at base of apical segments ; 

 apical margins of segment 3 and the following usually are narrowly nlargined 

 with yellow at apex ; wings subfuscous, nervures and stigma reddish or yellowish 

 brown; third discoidal cell broad, the cubito-discoidal vein broken above; four 

 anterior legs fulvous with coxae and trochantei-s yellow; posterior coxae black, 

 trochanters yellow, femora and tibiae rufous with black annuli at base and apex, 

 tarsi blackish ; body finely punctured ; metatborax with apical portion rugulose; 

 metapleura smooth, punctured. 



Eight specimens from Michigan, Massachusetts, New Jersey, Dela- 

 ware and Connecticut (type, coll. Amer. Ent. Soc). 



Exyi^toii coiitracta n. sp. 



% . — 7 mm. Head and thorax black, with triangular orbital lines on lower 

 face, clypeus, mandibles, palpi, tegulae and apex of scutellums yellow ; legs as in 

 the preceding species, except that the black markings on hnid femora and tibiae 

 are more indistinct; abdomen black, with segments 2-4 rufous, apex of segments 

 3 and the following narrowly yellow ; petiole rather broad, carinate ; body pol- 

 ished, finely punctured ; apical portion of metatborax rugose, which are obscurely 

 transverse on the third median area; metapleura smooth, punctured, except 

 above coxae, where it is vertically aciculate; wings suhhyaline, nervures and 

 stigma brown ; third discoidal cell narrow owing to the vein above not being but 

 little arched. 



Three specimens from Nevada and Washington (type, coll. Am. 

 Ent. Soc. and G. C. D.). 



