CHARLES W. HOOKER. 129 



Tliyreodon luarginipennis Br. 



Thyreodon marginipennis Brulle, Hist. Nat. Ins. Hym., IV, p. 



152, n. 3, cf 1846. 



Ophion marginipennis Taschenberg, Zeitschr. f. d. Ges. Natur., 



46, p. 425, n. 3 1875. 



Thyreodon ntarginipenne Holmberg (E. L.), Anal. Soc. Cient. 



Argent., 18, Pt. S, p. 227, n. 37 1884. 



" marginipennis Dalla Torre, Cat. Hym., Ill, p. 185 1901. 



" " Szepligeti,Gen. Ins., Hym., 34n>e Fasc, 



p. 25, n. 14 1905. 



Black; wings flavo-ferruginous, with the apex fuscous ; nervures 

 reddish except in the smoky portion ; metathorax strongly rugose. 



Length, 25 mm. 



Head with face strongly rugose, the interantennal fossa with its edge 

 much raised ; basal segment of the antennae red, the second red at 

 the outer end, the remaining segments black ; mandibles with the 

 middle reddish ferruginous ; metathorax very finely punctate ; the me- 

 dian lobe of the mesonotum raised in the middle and finely rugose the 

 whole length of the deep parapsidal furrows ; metathorax strongly 

 rugose, without median dorsal furrow ; metanotum and pleurae a little 

 flattened. Scutellum strongly punctate ; wings light yellow to ferru- 

 ginous, apex smoky, in the manner of a transverse band ; nervures 

 red except in the smoky portion where they are brown, their arrange- 

 ment as in T. morio Fabr. ; legs and anterior tarsi reddish-brown ; 

 abdomen black, anal valves truncate. 



Type. — 9 . Location unknown to me. 



I have not seen the type or a specimen of this species, and 

 can only give the original description as modified by Holm- 

 berg who writes as follows : 



" Brulle cites this species from Buenos Ayres, from where I also re- 

 ceived it, and the only one, but he says nothing of the brilliant steel- 

 blue of the specimen seen under certain conditions of light. He notes 

 that the wings are washed with yellow, but I have before me one where 

 they are lion-colored or ferruginous ; he had a mutilated male speci- 

 men, and that is the one which I examined." 



Distribution. — Buenos Ayres, Argentina. 



Thyreodon flainniipennis Ashm. 

 Thyreodon flammipenms Ashmead, Proc. Cal. Acad. Sci., IV, p. 



125, n. 10, 9 1894. 



Dalla Torre, Cat. Hym., Ill, p. 185 1901. 



" " Szepligeti,Gen. Ins., Hym., 34me Fasc, 



p. 25, n. 8 1905. 



TRANS. AM. ENT. SOC, XXXVIII. (17) 



