ART. 14 NEW ICHNEUMON-FLIES CUSHMAN 13 



ences between this species and the typical Lathrolestes. Otherwise 

 its similarity of form and structure, especially that of the head, 

 leaves no doubt of its very close relationship, and I do not believe 

 the propodeal difference is sufficient to be considered of generic value. 



LATHROLESTES RUFIGASTER, new species 



As in mnemonicae (Kohwer) the propodeum is almost completely 

 areolated, though otherwise this species is structurally nearly typical 

 of the genus. 



FeTnale. — Length 4.5 mm; antennae 4.5 mm. Head very finely 

 shagreened, transverse; temples strongly convex but not reaching 

 outside tangent of eyes, polished; occipital carina very broadly 

 interrupted medially ; ocell-ocular line much longer than postocellar 

 line and more than twice as long as diameter of an ocellus; clypeus 

 broadly truncate and medially impressed at apex and fringed with 

 long hairs ; malar space very short ; mandibles long, with lower tooth 

 much larger and longer than upper tooth; antennae filiform, very 

 densely pilose, 33- jointed. Thorax minutely shagreened and sub- 

 polished, less distinctly sculptured laterally, the pronotum laterally 

 polished; notauli weakly impressed anteriorly; propodeum with all 

 carinae except basal distinct, areola longer than broad, rounded ante- 

 riorly, the sides parallel posteriorly; areolet oblique rectangular. 

 Abdomen faintly shagreened, subpolished ; first tergite nearly twice 

 as long as broad at apex, dorsal carinae distinct basally, spiracles 

 before middle ; ovipositor short, the sheath protruding only slightly 

 beyond hypopygium. 



Black, with abdomen except petiole and legs except tarsi ferrugi- 

 nous ; mandibles and palpi pale ferruginous ; antennae fuscous, more 

 reddish below, especially at base; wings hyaline, venation brown, 

 tegulae and radices whitish ; tarsi fuscous. 



Male. — Essentially like female. 



Host. — Metallus hethunei MacGillivray. 



Type locality. — Grimsby, Ontario, Canada. 



Ty^e.— U.S.N.M. No. 44073. 



Remarks. — One of each sex reared September, 1920, by L. Caesar. 



Genus MESOLEIUS Holmgren 



MESOLEIUS PHYLLOTOMAE, new species 



In Schmiedeknecht's " Opuscula Ichneumonologica " key to the 

 European species of Mesoleius, this species runs best to ynelanoleucus 

 Gravenhorst. From that species, however, it is at once distinguish- 

 able by its smaller size, slender abdomen, and polished, almost un- 

 sculptured, integument. In the generic key it might almost, because 

 of the slender abdomen, be run to the genus Saotis, but the abdomen 

 is not compressed. 



Female. — Length 6 mm. Head polished, but faintly alutaceous, 

 face and f rons subopaquely so ; temples reaching outside line of eyes. 



