Superfamily ICHNEUMONOIDEA 477 



Genus ACRORICNUS Ratzeburg 



Acroricnus Ratzeburg, 1852. Ichn. d. Forstinsecten, v. 3, p. 92. 



Type-species: Acroricnus scliauviii Ratzeburg. Monotypic. 

 Xenodocon Foerster, 1855. Naturh. Ver. Rheinlande, Verb. 12: 237. 



Type-species: Xenodocon ruficoniis Foerster. Monotypic. The type-species is 

 regarded as a synonym of A. nediicfor (Scopoli). 

 Macrobatiis Holmgren, 1856 (1854). Svenska Vetensk.-Akad. Handl. 75: 50. 



Type-species: Cryptua macrobatu>i Gravenhorst. Monotypic. 

 Linoceras Taschenberg, 1865. Ztschr. f. die Gesam. Naturw. Halle 25: 105. 



Type-species: Cryptiis viacrobatun Gravenhorst. Desig. by Viereck, 1914. 

 Leptobatides Buysson, 1896. In Andre, Spec. Hym. Eur. Alg., v. 6, p. 678, pi. 3. 



Type-species: Leptobatides abeillei Buysson. Monotypic. 

 Agatliobanclius Ashmead, 1900. U. S. Natl. Mus., Proc. 23: 97. 



Type-species: Banchns aequatus Say. Monotypic and orig. desig. The type-species 

 was misidentified by Ashmead, who based his description of Agathohanchits upon 

 specimens of Agathilla bradleyi (Viereck) (see Cushman and Gahan, 1921). 



This small genus is widely distributed in the northern hemisphere. The hosts are larvae of Eu- 

 menidae and Sphecidae. 



Revision: Mitchell, 1950. Ent. Soe. Amer., Ann. 43: 249-261. 

 Taxonomy: Cushman and Gahan, 1921. Ent. Soc. Wash., Proc. 23: 158-159. 

 stylator aequatus (Say). N. S. s. to S. C, w. to Man. and Mo. Host: Ancistrocenis 



bireniniaciilatus (Sauss.), A. adiabatns (Sauss.), Eumenen fraternus Say, Sceliphwn 

 cae)nentanu)ti (Drury). The gradual south-to-north reduction in the amount of yellow 

 pigmentation led Townes (1944) to divide this subspecies into two. The name aequatus 

 was applied to the northern population, presumably to agree with Say's color 

 description. Mitchell (1950) and Townes and Townes (1962) applied the name aequatus in 

 the same manner. The inconsistencies in Say's color description of aequatus indicate 

 that it would not be accurate enough to show that it applies to a specimen collected 

 north of the type-locality (which was indicated as "Indiana," but which presumably 

 would have been southwestern Indiana). Therefore, those wishing to recognize an 

 arbitrary division of A. s. aequatus into two subspecies should apply the name aequatus 

 to the southern population. 



Banchus aequatus Say, 1836. Boston Jour. Nat. Hist. 1: 247. [male]. 



Cryptus junceus Cresson, 1864. Ent. Soc. Phila., Proc. 3: 295. 9. N. syn. 



Atractodes Cloutieri Provancher, 1874. Nat. Canad. 6: 150. 6, 9. 



Taxonomy: Cushman and Gahan, 1921. Ent. Soc. Wash., Proc. 23: 158. —Townes, 1944. Amer. 

 Ent. Soc, Mem. 11: 296-297. —Mitchell, 1950. Ent. Soc. Amer., Ann. 43: 258-259. —Townes 

 and Townes, 1962. U. S. Natl. Mus. Bui. 216 (pt. 3): 474. 



Biology: Walsh and Riley, 1869. Amer. Ent. 1: 137. 

 stylator edwardsii (Cresson). Western Oreg., Calif. Host: Sceliphron caementariuin (Drury). 



Linoceras Edwardsii Cresson, 1879 (1878). Acad. Nat. Sci. Phila., Proc. 30: 365. S. 

 stylator excelsus (Cresson). Western S. Dak., Colo. The range of this form is almost entirely 

 overlapped by the southern end of the range of s. niger, which casts doubt upon'the 

 validity of the distinction between them. 

 Cryptus excelsus Cresson, 1864. Ent. Soc. Phila., Proc. 3: 293. 6,9. 

 Acroric7ius stylator axilaris Mitchell, 1950. Ent. Soc. Amer., Ann. 43: 259. 9. Synonymy 

 based upon data in the tribal revision of Townes and Townes (1962). N. syn. 

 stylator niger Mitchell. Alta. s. to Colo. w. to B. C, e. Wash., e. Oreg., and Utah. 



Acroricnus stylator niger Mitchell, 1950. Ent. Soc. Amer., Ann. 43: 253. 6, 9. 

 stylator stylator (Thunberg). Western N. W. T., n. B. C; Eurasia. 



Ichneumon stylator Thunberg, 1822; 1824. Acad. Imp. des Sci. St. Petersburg, Mem. 8: 265 



(key); 9: 320. [male]. 

 Cryptus niacrobatus Gravenhorst, 1829. Ichn. Europaea, v. 2, p. 440. 6,9. 

 Acroricnus Schauniii Ratzeburg, 1852. Ichn. d. Forstinsecten, v. 3, p. 92. 6. 

 Xenodocon ruficornis Foerster, 1855. Naturh. Ver. Rheinlande, Verb. 12: 237. 9. 



