CHARLES W. HOOKER. Ill 



9 and cf , types No. 65, Mexico. U. S. National Museum, 

 9 , Cuernavaca, Mexico. Massachusetts Agricultural Col- 

 lege, 9 and cf , homotypes, Alta Mira, Mexico, VI, 26. 



Thyreodon nigro-cseruleus Cam. 



Thyreodon nigro-cceruleus Cameron, Journ. Royal Agr and Com- 



mer. Soc, British Guiana, I, p. 180.. 1911. 



"Length, 27 mm. 



"Black, tinged with blue on the pleurae and metanotum ; wings 

 uniformly fuscous-violaceous, the nervures and stigma black. Face 

 covered with pale, the thorax more densely with longer black pubes- 

 cence, which is longest on the scutellum. Head and thorax closely 

 punctured, the center of the scutellum smoother than the sides. The 

 sides of the metanotum finely, sparsely punctured, the center raised, 

 irregularly longitudinally reticulated ; the top of the slope finely, obli- 

 quely striated, the striae interlacing ; the sides below are more strongly 

 obliquely striated, smooth on the inner side ; the central furrow is 

 strongly, not very closely, transversely striated. Metapleurae closely 

 finely obliquely striated. Front broadly raised between the antennae 

 and ocelli, the sides depressed, the depression narrowed above, the 

 bottom, except at the top, finely, closely striated. Female. 



"Apex of clypeus transverse, its sides broadly rounded. Sides of 

 scutellum keeled to shortly beyond the middle." 



This is evidently closely related to T. cyaneus Br., and may 

 be a synonym for it is based on only one specimen, and the 

 long pubescence on the face and scutellum may be abnormal. 



Distribution. — British Guiana. 



Location of specimens. — Georgetown Museum, Brit. Guiana. 



Thyreodon cyaneus Br. 



Ophion morio Spinola, Ann. Ent. Soc. Fr., IX, p. 168, n. 22, 9 



{nan Fabr.) 1840. 



Thyreodon cyaneus Brulle, Hist. Nat. Ins. Hym., IV, p. 151, n. 



1, 9cf, pi. 42, fig. 3 1846. 



Ophion cyaneus Taschenberg, Zeitschr. f. d. Gas. Natur., 46, p. 



425, n. 1 1875. 



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



" " Szepligeti, Gen. Ins., Hym., 34me Fasc, p. 25, 



n. 4 1905. 



" intermedius Szepligeti, Ann. Hist. Nat. Mus. Nat. 

 Hung., IV, Part 1, p. 133, Obidos, 

 Brazil 1906. 



TRANS. AM. ENT. SOC, XXXVIII. 



