NO. 2284. A'/(;iy NORTH AMERICAN ICHNEVMON-FLIEH—CUSHMAN. 531 



to the group accentuates the relation of Heleostizus to the rather dis- 

 similar appearing Cryjjfoideus. 



The following key will serve to distinguish the three genera : 



Areolet small or not deflued, second iutercubitus wanting or very weak; 

 nervulus postf ureal ; nervellus strongly antefurcal : sculpture of body 

 largely finely granulate; propodeuni and metapleurum separated by a sharp 

 carina; first abdominal segment not or barely longer tban second, broad, 

 only subpetiolate, its ventral margin straight; clypeus sharply, angulately 

 inflexed beyond middle; the entire habitus of the insect strongly Ichneu- 

 monine (Pimpline) Helcostisus (Foerster) Dalla Torre. 



Areolet large, complete, the intercubiti strongly convergent above; nervulus 

 antefurcal ; nervellus postfurcal or subperpendicular, never antefurcal ; 

 body sculpture strong, rough, that of abdomen less strongly so; first ab- 

 dominal segment usually distinctly longer than second, slender, distinctly 

 petiolate, its ventral margin decurved; clypeus not angulately inflexed; 



habitus Cryptine 1- 



1. Head strongly transverse, cheeks not swollen, temples narrow, their cephalo- 

 candad diameter much less than that of the eye; propodeum with only the 

 basal transverse carina developed, this but slightly curved in the middle, 

 basal median area not at all indicated, spiracle far from base; first tergite 

 with very weak dorsal carinae, the spiracle in or slightly before the mid- 

 dle ; head and thorax white marked ; wings not banded ; front femur in; 

 female concave below Cryi)tohclcosti::us, new genus. 



Head strongly swollen, temples broad, their cephalo-caudad diameter nearly or 

 quite as long as that of the eye ; propodeum with the apical carina more or 

 less developed, .sometimes obsolete medially, the anterior subangulate or 

 strongly curved medially, basal median area more or less defined, spiracle 

 very close to the base ; first tergite with strong dorsal carinae, the spiracle 

 behind the middle; head and thorax without white markings; wings 

 banded or at least infuscate in the region of the stigma; front femur not 

 concave below Cryptoidcus Ashmead, 



Genus HELCOSTIZUS (Foerster) Dalla Torre. 



Brachyccntriis Taschenbekg, Zeitschr. Gesammten. Natur., vol. 25, 1SG5, 



p. 106. 

 Mesocryptus Thomson, Opusc. Ent., fasc. 5, 1873, p. 519. 

 Asternaulax A^iereck, Proc. U. S. Nat. Mus., vol. 42, 1912, p. G32. 



KEY TO NORTH AMERICAN SPECIESj FEMALES ONLY. 



Propodeum with two distinct transverse cai-inae, petiolar area strongly, longi- 

 tudinally rugose; second iutercubitus entirely lacking, the areolet not 

 defined i hicarmutus, new species. 



Propodeum with only one transverse carina ; areolet defined by position 1. 



1. Hind tibiae and tarsi black with sharply defined white basal aunuli 2. 



Hind tibiae unicolorous 3. 



2. Annulus of antenna embracing several joints ; propodeum not polished at 



base; first tergite with broad, indistinct carinae fiskei (Viereck). 



Annulus of antenna very .small ; i)ropodeuni polished at base ; first tergite 

 without carinae canadensis (Provancher). 



3. First tergite nearly as v.'ide at apex as lung; luesoscutum black; vertex 



opaque shagreened ijukoncnsis (Ashmead). 



F'irst tergite much longer than wide at apex ; mososcutuui red ; vertex 

 polished rufisciiiiim, new species. 



