300 AMERICAN HYMENOPTKRA. 



tarsi and tibise at base and apex, black or blackish; remainder of legs rufous ; 

 antennfe reddish brown ; wings hyaline, nei'vures and stigma brown. 



% . — Differs only in having the entire face yellow and in having the annulus 

 on posterior tibise narrower and more distinct. 



Two specimens, Colorado and New Hampshire (types, coll. Amer. 

 Ent. Soc). 



IVIesoleiiis conform iis n. sp. 



9 % . — 6-7 mm. Black, with clypeus, mouth-parts, tegulae and spot before and 

 sometimes spots above sides of clypeus. yellowish white; legs rufous, with tarsi 

 and apex of tibise on posterior legs dusky ; scutellum sometimes piceous ; antennae 

 brown, scape pale beneath in % ; wings hyaline, iridescent, nervures and stigma 

 brown ; posterior coxae rather larger than usual and globular. 



Four specimens from Colorado, Mt. Hood, Oregon, New York 

 and New Hampshire (types, coll. Amer. Ent. Soc. and Davis). 



Iflesoleiiis arficiilariM n. sp. 



9. — 5-7 mm. Black, \?ith clypeus, mouth-parts, tegulje, sometimes spot on 

 lateral margins of mesonotum and narrow apical margins of the apical abdominal 

 segments, yellowish white; posterior coxse and basal trochanter black; posterior 

 tarsi and tibiae at apex, dusky ; remainder of legs rufous ; antennae brown ; wings 

 hyaline, nervures and stigma brown. 



Three specimens from Colorado and Washington (types, coll. 

 Amer. Ent. Soc. and Davis). 



Tribe MBSOLEPTINI. 



1. Head more or less enlarged ; compound eyes small 2. 



Head not exceptionally enlarged 8 



2. Longer spur of hind tibiae shorter than second member of tarsi 3. 



Longer spur as long, or longer than second member of hind tarsi 5. 



3. Wings with an areolet Spaiioteciiiis Foerst 



Wings without an ayeolet 4. 



4. Humeral cross-nervure broken below the middle Eclytus Holmgr. 



Humeral cross-nervure broken above the middle; metanotum comjjletely 



areolated *IchiiJeops Foerst. 



5. Head very much enlai'ged above, occiput very deeply hollowed ; second re- 



current nervure usually angularly broken Polyoncus Foerst. 



Head not greatly enlarged above; second recurrent nervure not angularly 

 broken 6 



6. Stigma small; basal segment of flagellum plainly longer than the second; 



spiracles of metatherax longer than broad and lying closer to the su- 

 perior external area than to apical margin of ])leura; segment 1 with- 

 out a deep groove at side of the base Sychiioleler Foerst. 



Stigma broad ; basal segment of tiagellum not decidedly longer than the 

 second ; spiracles of metathorax circular and not lying nearer to the 

 superior external area ; segment 1 with a deep groove at side of base.?. 



7. Humeral cross-nervure broken below the middle. L.a|>hyi'0««iC0|>US Foerst. 

 Humeral cross-nervure broken at or above the middle- -I'erilissus Foerst. 



