170 PROC. ENT. SOC. WASH., VOL. 23, NO. 7, OCTOBER, 1921 



Say, leaving for a later time the revision of the genus. These 

 characters are: "antennae somewhat shorter than body" and 

 "vertex with a black spot." In addition to these the neotype 

 designated below has the antennae brownish with scape paler, 

 head yellow, discocubital vein without a ramulus, and color of 

 venation and size as described. The pleura are not noticeably 

 yellow, but this character is extremely variable. 



Neotype. A male taken June 14, 1918, at Falls Church, 

 Virginia, by R. A. Cushman. 



56. (Ophion) Eremotylus glabratus (Say). 



Ophion glabratus Say, Boston Journ. Nat. Hist., vol. 1, 1835, p. 239 (Leconte 



ed., vol. 2, p. 695); Riley and Howard, Ins. Life, vol. 3, 1890, p. 155. 

 Eremotylus arctiae Ashmead, Trans. Am. Ent. Soc., vol. 23, 1896, p. 192. 

 Ophion glabratus Viereck, in Smith's Ins. of N. J., 1909, p. 620 and 621. 

 Eremotylus arctiae Viereck, loc. cit. 



Hooker 1 synonymized this with macrurns (Linne), but it 

 appears to us that Say's description applies better to arctiae 

 Ashmead, especially in the size and the glabrous area of the 

 discocubital cell. The latter is much more conspicuous and 

 elongate in arctiae and thus agrees better with Say's "longi- 

 tudinally ovate spot" than does the small spot of macrurus. 

 Moreover, Riley and Howard and Viereck had previous to 

 Hooker recognized glabratus as a parasite of Hyphantria cunea^ 

 which is also commonly a host of arctiae. 



57. (Ophion mundus Say) =Therion morio Fabricius. 



Ichneumon morio Fabricius, Spec. Ins. 1, 1781, p. 436, n. 100. 



Ophion morio Fabricius, Suppl. entom. System. 1798, p. 237, n. 8. 



Ophion mundus Say, Boston Journ. Nat. Hist., vol. 1, 1836, p. 239 (Leconte 



ed.,vol. 2, 1859, p. 695, n. 3). 



Anomalon flavipes Brulle, Hist. Nat. Ins. Hym., vol. 4, 1846, p. 170. 

 Exochilum mundus Norton, Proc. Ent. Soc. Phila., vol. 1, 1863, p. 360, n. 10. 

 Anomalon nigripenne Provancher, Nat. Can., vol. 6, 1873, p. 173. 

 Exochilum morio Morley, Rev. Ichn., Pt. 2, 1913, p. 73. 

 Therion morio Viereck, Bull. 22, Conn. Geol. & Nat. Hist. Surv., 1916, p. 286. 



This species has become well known in American literature 

 under the name of Exochilum mundum. The synonymy of Say's 

 species with morio Fabricius was first pointed out by Morley in 

 1913 after an examination of the Fabrician type. The genus 

 Exochilum Wesmael is a synonym of Therion Curtis as pointed 

 out by Rohwer, Cushman, and Gahan. 2 



iTrans. Am. Ent. Soc., vol. 38, 1912, p. 148. 

 2Proc. Ent. Soc. Wash., vol. 17, 1915, p. 149. 



