CHARLES W. HOOKER. 19 



and a tachinid from E. macrurus within cocoons of Samia 

 cecropia and Callosamia promethea. One larva of Thyreo- 

 don morio was apparently killed by a fungus which at- 

 tacked its host, Paonias {Smerinthus) exctzcatus. Other 

 members of the tribe may be attacked by these or other 

 enemies, but no cases are recorded. Birds, reptiles and 

 amphibia are probably of little importance as enemies. Ere- 

 motylus macrurus frequently fails to make a proper pupa and 

 Dr. J. B. Smith* records a case where " out of 76 cocoons 

 of this insect only 19 adults were obtained, due not to hyper- 

 parasitism, but a simple failure of the larvae to make a proper 

 pupa." This experience, however, is not a new one, for in 

 years past he " has cut Ophion cocoons in large numbers, 

 finding sound larvae and pupae as exceptions only, and a 

 putrid, brown, semi-fluid mass as a rule." Mr. Grossbeck 

 states that he has never found anything but the same pasty 

 mass, and therefore it seems that this parasite is kept in 

 check by some disease that reaches it within the body of its 

 host. There is room here, however, for considerable in- 

 vestigation. 



Genus AGATHOPHIONA Westw. 

 Agathis, nom. propr. Hym. ; Ophion, nom. propr. Hym. 

 Agathophiona Westwood, Tijdschr. v. Ent., Vol. XXV, p. 29 1882. 



'* Cameron, Biol. Centr. Amer., Hym., I, p. 298, No. 



1, pi. 12, fig. 11 1886. 



Ashmead, Proc. U. S. Nat. Mus., No. 1206, pp. 89, 



162 (Vol. XXXIII, 1901) 1900. 



Dalla Torre, Cat. Hym., Ill, p. 179 1901. 



" Szepligeti, Gen. Ins. ; Hym., 34me Fasc, p. 29 1905. 



Body elongate ; abdomen long and compressed, but stouter 

 and thicker than in Ophion ; head buccate ; labium greatly 

 lengthened, bipartite, lobes filiform ; neuration of wings 

 similar to Ophion ; claws pectinate. 



Generic type. — cf. A. fulvicornis Westw. (monotypical). 

 Location unknown.! 



* Smith, Journ. Econ, Ent., I, No. 5, pp. 293-297, 1908. 



t It is not in the British Museum and is perhaps destroyed, but may 

 possibly be at Oxford. 



TRANS. AM. ENT. SOC. , XXXVIU. 



