G. C. DAVIS. 285 



median nervure; the latter unites back of basal nerviire; humeral cross-nervure 

 broken in the middle; body siilipolished, shagreened. finely punctured; face 

 oval; clypeus depressed, oval, emarginate, finely margined at apex, narrowed 

 laterally; parapsidal grooves indicated; metanotum without a carina; abdomen 

 arched, strong, well compressed at apex, strongly excavated at apex on dorsum 

 for the ovipositor, which is slightly exserted, projects upward ; petiole moderately 

 broad, slightly narrowed toward apex, with deep furrow bordered by oval ridges 

 on either side. 



One specimen from District of Columbia (type, coll. Am. E. S.). 

 This may belong to the genus Polycinctns, but the petiole is much 

 broader than any of our other .species. 



1>IAL,GES Foerster. 

 (Synopsis der Fam. und Gatt. der Iclineumonen, 1868.) 

 Posterior coxae black ; scutellum almost always black. 



Hiud tibife and tarsi black or piceous, with yellow annulns. .frontalis n. sp. 



Hind tihia> and tarsi rufous with yellow annulus tricolor n. var. 



Posterior coxa? rufous. 



TilMffi black with yellow annulus; scutellum yellow rivalis n. var. 



Tibiffi black, white at base ; scutellums white fasciatiiN n. sp. 



DialgeM TroiitaliM n. sp. 



9 % ■ — 7 mm. Black, witli clypeus, mouth-parts, median spot beneath antennte, 

 usually two orbital spots beneath, sometimes the entire face and scape beueath, 

 tegulfe, sometimes spot before and triangular spot on lateral margins of meso- 

 notum, rarely the scutellum, trochanters, four anterior coxre and broad annulus 

 on posterior tibiae, greenish to a reddish yellow ; abdomen rufous, more or less 

 marked with black, petiole black except at apex, four anterior legs rufous or 

 yellow, posterior legs with- coxae, and sometimes trochanters, black ; tarsi, apex 

 of tibife and narrow base black or piceous, femora rufous; antennse reddish 

 brown; wings hyaline, iridescent, nervures and stigma brown, yellow at base; 

 stigma triangularly lanceolate, the marginal nervure uniting before middle; 

 areolet oblique; humeral cross-nervure of hind wing broken but little below the 

 middle; body pilose, sparsely punctured, suhpolished ; head transverse, excavated 

 behind, somewhat tubcrculate in front beneatJi antennae ; clypeus narrow, trans- 

 verse, impressed near apex ; parapsidal grooves indicated anteriorly; scutellum 

 elevated, triangular, rounded ; metathorax carinate, lacking only the transverse 

 basal carina ; abdomen ]>olished, smooth ; ovipositor exserted, guides small ; petiole 

 slender, as in Mesoleptinii, gradually widening, si)iracles tuberculate, carinse 

 prominent aii/l extending nearly to the apex. 



Four females and five males from New Hampshire, Michigan, 

 Colorado and Indiana (types, coll. Davis and Am. Ent. Soc. ). 



Var. tri(M>lor diflFers in having the posterior tibise and tarsi rufous; the 

 yellow annulus is distinct on the posterior tibiie ; the abdomen is black at the 

 extreme base and apex. 



Two females and five males from New Hampshire, Massachusetts, 

 Illinois and Montana (types, coll. Davis and Am. Ent. Soc). 



TKANS. A.M. KNT. SOC. XXIV. OCTOBER. 1897. 



