ICHNEUMON-FLIES — GELINAE*. MESOSTENINI 515 



1. Helcostizus annulicornis (Walsh) 



Echthrus annulicornis Walsh, 1873, Trans. Acad. Sci. St. Louis, vol. 3, p. 159; 



9. Type: 9, Illinois? (destroyed in Chicago fire of 1871). 

 Helcostizus hicarinatus Cushman, 1919, Proc. U.S. Nat. Mus., vol. 55, p. 532; 



9. New synonymy. Type: 9, Falls Church, Va. (Washington). 



Front wing of male 4.0 to 6.0 mm. long, of female 5.8 to 8.5 mm. 

 long; tyloids on male flageUum in form of low, rounded, obliquely 

 longitudinal ridges on about 4 segments; body of medium build; 

 propodeum about 0.90 as long as wide, its apical half rather steeply 

 sloping; ninth tergite of female, as seen from above, about 1.3 as long 

 as wide; ovipositor about 0.55 as long as front wing. 



The above structural characters are those by which most species of 

 Helcostizus differ among themselves. In addition, this species differs 

 from all the rest as follows: Areolet receiving second recurrent vein 

 beyond the middle (at or near the middle in other species); apical 

 transverse carina of propodeum complete or narrowly interrupted 

 medially (the carina absent in other species); median longitudinal 

 carina of first tergite rather strong and moderately sharp on its basal 

 half, traceable to apex of tergite but fading apically (these carinae 

 low and indistinct in other species, usually not traceable to apex of 

 tergite) ; all teeth of ovipositor tip vertical (in other species the basal 

 tooth slanted at about 45°, the next two less strongly slanted, and the 

 rest vertical). 



Male: Black. Face partly or entirely, clypeus, stripe on front of 

 scape, labrum, spot on base of mandible, more or less of palpi, ex- 

 treme hind corner of pronotmn, tegula, and front coxa and trochanters, 

 white; mandible and palpi largely stramineous or brown; front leg 

 beyond trochanters fulvous, the fifth tarsal segment fuscous; middle 

 coxa, femur, and tibia fulvous, the tibia with a broad basal whitish 

 band; middle trochanters whitish, tinged with fulvous; middle tarsus 

 fulvous, infuscate apically, the basitarsus with a whitish band at 

 base; hind coxa, trochanters, and femur fulvous, the apical 0.3 ± of 

 femur infuscate; hind tibia black, its basal 0.25 white; hind tarsus 

 black, the basitarsus white on its basal 0.3. 



Female: Black. Labrum stramineous; mandible reddish brown; 

 palpi fuscous; flagellum with a white band covering about 3 segments, 

 the band incomplete below; tegula and extreme hind corner of pro- 

 notum white; front coxa and front and middle trochanters fulvous. 

 Legs colored otherwise as in male. 



Specunens: cf, Takoma Park, Md., Oct. 7, 1945, H. and M. Townes 

 (Townes). 9, Patuxent Refuge, Bowie, Md., May 1, 1948, R. M. 

 Mitchell (Mitchell). 9, Kalkaska Co., Mich., June 11, 1955, R. R. 

 Dreisbach (Dreisbach). cf , Ithaca, N.Y., May 28, 1947, W. Mason 



