214 AMERICAN HYMENOPTERA. 



Triclistus atrieeps Walsh (Exuchns). Trans. St. Louis Acad. Sci. iii. 95, % 

 Exochus rufornaculaius I'rov., Add. Faune Hymen. 113, J. 

 % 9- — 6 mm. Pale rufous; head, lateral and anterior margins of mesonotum, 

 region around scutellums and two apical segments of ahdomen, black; extreme 

 tips of femora, tibise and tarsal segments of hind legs, obfuscated ; face, anterior 

 orbits above, mouth, cheeks beneath, tegulse, broad line along humeral sutui-e, 

 four front legs, and hind legs with tip of coxse, trochanters, spurs and tarsi, yel- 

 lowish white to white; thorax and abdomen with distinct, rather close, shallow 

 punctures; carina on base of abdomen reaching one-third of the way back; 

 wings subhyaline, veins and stigma black, areolet wanting. 



Illinois and Canada. 



Types not seen, and this description is condensed from Walsh's, 

 which is very complete and minute in detail. Provancher's descrip- 

 tion agrees so well that there remains little doubt of the synonymy. 



META€CE1,IJS Foerster. 

 (Synop. d. Fam. und Gatt. d. John. 1868.) 



Characterized by having the face strongly protruding beneath the 

 antennae and hollow and flat above, so that a sharp ridge is formed 

 between the vertex and occi})ut. 



Uletacoelus laevis Cress. (Exochus), Proc. Ent. Soc. Phil, iii, 286. 

 J '^ . — 5-7 mm. Brownish black, with the legs and palpi brownish red, and 

 antennae still darker; face pilose, closely punctured and with a dark red stain 

 beneath the antennse; mesonotum closely punctured ; remainder of thorax shin- 

 ing, smooth, metanotum completely areolated ; abdomen smooth, shining; basal 

 segment with distinct carinse ; scape, posterior coxae and femora incrassate. 



Many specimens from Canada, New York, Michigan, Illinois, 

 Colorado, Washington, Oregon and California. 



This species may prove to be synonymous with M. femoralis Four- 

 croy, of Europe. 



EXOCHUS Gi-av. 

 Grav. Ichn. Europaea, T. ii, p. 328 (1829). 



Characterized by not having the face beneath the antennse greatly 

 produced, and by having the vertex oval, so that there is no sharp 

 ridge between the vertex and occiput. 



The species may be separated as follows : 



Posterior tibia? with an unabbreviated vitta ; abdomen, except apex, rufous. 



albiceps Walsh. 

 Posterior tibise with a pale annulus. 



Abdomen black, or dusky rufous at base. 



Mesopleura, and usually most of thorax, rufous dorsalis Cress. 



Mesothorax not rufous var. ailillilicrus Walsh. 



Abdomen, except basal segment, rufous solitarius n. sp. 



