240 AMERICAN HYMENOPTERA. 



Four females and two males from New Hampshire, New York 

 and Mast^achusetts (types, coll. Anier. Ent. Soc. and G. C. D.). 



Exyston variatus Prov., Faiine Ent. Can. ii, 407. 



9 % ■ — 7-8 mm. Honey-yellow to rufous, with spot enclosing ocelli and sutures 

 around scutellum, and sometimes most of sternum, lower half of pleura, part of 

 posterior coxae and all of prothorax, black ; legs, with coxae and trochanters, 

 yellowish; posterior legs color of body; face, orbital lines in front, scutellums 

 and prosternum pale yellow ; antennse rufous, dusky at base above ; wings hya- 

 line, nervures and stigma brown ; thorax poli^^hed ; apical portion of nietalhoiax 

 coarsely punctured, petiole of abdomen strongly carinate, with that and the fol 

 lowing segments polished. 



Five males and four females from Michigan, So. Dakota, Colorado, 

 New Jersey, Canada, New Hampshire and New York. 



Exystii!^ ven4istus Cress. {Cteniscus), Proc. Ent. Soc. Phil, iv, 263. 



9 • — 10 mm. Transparent rufous with face, anterior orbits, mouth-parts, 

 tegulse, spot beneath, anterior part of mesosternuni. prosternum, apical portion 

 of scutellums. most of legs, apex of third abdominal segment, apical third of 

 fourth, all but base of fifth and all of remaining segments, yellowish white; 

 posterior coxse and all the femora tinged with rufous; posterior tibise dusky at 

 base and apex; antennse rufous, blackish at base; scape pale at base beneath; 

 wings smoky, appearing like smoked glass; veins brown, .stigma and costal mar- 

 gin yellowish ; third discoidal cell broad, the vein above broken and with a long 

 stump: thorax and abdomen polished, shining ; apical median cell indistinctly 

 transversely rugulose; petiole oval, polished, spiracles prominent. 



Two specimens from Colorado (types, coll. Amer. Ent. Soc). 



Exyiiiton politiis n. sp. 



9. — 8 mm. Yellowish white with the following parts pale rufous; vertex 

 above antennae, occiput, upper portion of cheeks, median and lateral stripes on 

 mesonot\im, stripe on mesopleura extending from wings to middle coxae, trans- 

 verse narrow stripe at base of metanotuni, spot covering apical portion of meta. 

 thorax, basal half of petiole and narrow stripe at ba.se of segments 2-5; spot 

 enclosing ocelli and basal portion of antennae, blackish ; wings hyaline, nervures 

 brown, stigma and costal margin reddish yellow; third discoidal cell narrow and 

 with a minute stump of a vein above; thorax and abdomen polished, shining; 

 apical median area transversely rugulose; petiole rather broad, polished, carinae 

 present on basal half, sjiiracles slightly raised. 



One specimen from So. California (type, coll. Amer. Ent. Soc). 



Tribe PLECTISCINI. 



1. Labrum more or less prominently projecting 2. 



Labrum not distinctly projecting 5. 



2. Metauotum not areolated 3. 



Metanotum with at least the area supero-media present 4. 



3. Wings with an areolet Adelognathus Holmgr. 



Wings without an areolet Sy njema Foer. 



4. Labrum deeply emarginate at apex; areolet wanting; abdominal segments 



2 and 3 very smooth Xotomeris Foer. 



Labrum not emarginate at apex ; areolet present ; abdominal segments 2 and 



3 not smooth Diieinisfhys Foer. 



