NO. 2284. j^EW NORTH AMERICAN ICHNEUMON-FLIES— CUSHM AN. 519 



First flagellar joint somewhat longer than second, this distinctly longer than 

 third ; radial cell not longer than stigma. 



Dorsal cai-inae of first tergite extending sharply and distinctly to be- 

 yond the middle; the ten joints of the flagellum before the last 



broader than long Microtorus Foerster. 



Dorsal carinae of first tergite not especially sharp and distinct; ten 

 flagellar joints before the last longer than broad. 

 Chrysopoctorms, new name, for Otacuates Ashraead, not Foerster. 



It is doubtful if either of the two characters separating the last 

 two genera is of generic value, but all of the three species of 

 Chrysopoctonus represented by females in the United States National 

 Musuem agree in both characters although there is some variation in 

 the strength of the petiolar carinae. 



The species of this genus may be congeneric with the species on 

 which Foerster based his description of Microtorus., but neither of 

 the species here included can be the genotype of Microtorus because 

 they all differ by the two characters used in the above key. 



Other characters of the genus in addition to those above and those 

 in Foerster's key are as follows : 



Head from above very broad, the temples flat or weakly convex 

 and very strongly receding, occipital carina complete, not angulate 

 medially, ocellar triangle very strongly transverse, the anterior ocel- 

 lus but little in front of the lateral ocelli ; head in front view much 

 broader than long, face and frons very broad, eyes very large and 

 nearly hemispherical, clypeus much broader than long, distinctly 

 separated, broadly arcuate at apex, not or but very weakly medially 

 impressed, without long hairs, flagellum somewhat thickened toward 

 apex, first three joints successively shorter, subapical joints slightly 

 longer than wide; fourth joint of maxillary palpi fully three-fourths 

 as long as fifth. Thorax very short and thick, mesoscutum fully as 

 broad as long, notauli very briefly impressed, sternauli complete or 

 nearly; prepectal carina complete and strong throughout, scutellum 

 laterally carinate well beyond base; propodeum nearly perpendicular 

 behind, completely areolated, the areola broader than long, spiracle 

 round, situated very close to lateral carina, legs long and stout, hind 

 femur reaching nearly to apex of abdomen, inner spur of hind tibia 

 nearly half as long as basitarsus; stigma broad with radius originat- 

 ing beyond middle, radial cell short, measured on metacarpus as long 

 as stigma, second intercubitus not or barely indicated, venation other- 

 wise complete, nervellus broken below the middle, second and third 

 abscissae of discoideus together about equal in length to the first 

 abscissa, second discoidal cell not especially narrowed at base. Ab- 

 domen relatively small, first tergite broad at apex, spiracles much 

 beyond middle, dorsal carinae rather weak, rest of abdomen broadly 

 oval, strongly depressed, segments beyond fifth in female not or 



