G. C. DAVIS. . 235 



tip of petiole, spot on either side at base of second segment and apical fifth of the 

 second and following segments, broadest in tfie middle, lemon-yellow ; posterior 

 cosje black; remainder of hind legs, except the yellow portions, and all femora 

 reddish piceous; four anterior tibiee and tarsi brownish yellow: wings hyaline, 

 nervures and stigma reddish brown ; third discoidal cell narrow, the vein above 

 arched, not broken and without stump of vein ; antennse black, piceous at apex ; 

 thorax and abdomen polished, finely punctured ; metathorax areolated as in 

 Exyston; areas rugose, apical median one distinctly transversely rugose ; petiole 

 carinate. coarsely punctured, slightly arched; second segment punctured, and 

 much broader at base than petiole is at apex, rapidly and evenly broadening 

 toward apex, third and fourth segments nearly equal in breadth ; fourth and 

 fifth narrowing and oval. 



One male specimen from New York (coll. Amer. Ent. Soc.) ; 

 female, N. Illinois (coll. U. S. Nat. Mus.;. 



EXYSTON Schiodte. 

 (Ichneumonidarum ad Faunam Danise, p. 12. not., 1839.) 



The princi})al characters of the genus are : mandibles with teeth 

 of equal length, clypeus separated by a groove ; thorax globular, 

 pilose ; metathorax completely areolated, the basal areas polished, 

 not punctured ; tarsal claws not pectinate ; wings with an areolet ; 

 abdomen clavate, pilose ; petiole long, slender and hairy, with spira- 

 cles in the middle and an ear-like enlargement at the base. 



Species as follows : 



Abdomen black with yellow apical margins of segments. 

 Posterior femora and coxpe black and yellow. 



Abdominal segments narrowly yellow at apex iiis;reo n. sp. 



Abdominal segments broadly yellow inarginatiiili Prov. 



Posterior legs entirely lemon-yellow; thorax and abdomen largely yellow; 

 metathoracic areas, except third median, polished, and with weak 



cariniE exeelsiis Cress. 



Posterior femora, tibite and tarsi ferruginous; thorax and abdomen largely 

 yellow ; metathoracic areas separated by strong carinte. 



flavens n. sp. 

 Abdomen more or less rufous. 



Thorax black, with yellow or rufous markings. 



Scutellums black; abdomen and hind legs mostly black; face with broad 



central black strijie above clypeus iiigrosculuiii n. sp. 



Scutellums yellow only at tip; abdomen blackish at apex; posterior cox.e 

 black or blackish. 

 Hind femora black or piceous; abdomen black, except segments; apicHl 



margins of segments narrowly yellow speciostlN n. sp. 



Hind femora and tibiie rufous, narrowly black at base and apex ; abdomen 

 mostly rufous. 



TRANS. AM. ENT. SOC. XXIV. SEPTEMBER, 1897. 



