136 Bulletin Wisconsin Nationul History Society. [Vol. 9, No. 4. 



has not been found. On account of its host, it is better to con- 

 sider it but a doubtful synonym of minutum. I firmly believe that 

 it is best to accept the synonomy as given here because it is be- 

 yond question that the identities of intermedium, minutissimum and 

 pretiosum can never again be established with certainty 1 . As for 

 odoutoke it may be that its host is peculiar to it and for that 

 reason I place it as a doubtful synonym of minutum. Of those 

 citiations marked with an asterisk I have seen the actual speci- 

 men; of the others there are only one or two about which doubt 

 may arise concerning the actual identity of the species 2 . 



I have gone into the history of this species more at length 

 than is necessary in most cases, but the importance of establish- 

 ing its identity and synonomy is such that I believe the details 

 had better be aired and the matter settled, if possible, once for all 

 to the satisfaction of the systematic hymenopterologist. 



Family Trichogrammatidce. 



SUBFAMILY TRICHOGRAMMATIIN^E. 

 Genus Pentarthron Riley. 



1. Pentarthron minutum (Riley) 3 



Ichneumon species — Peek, 1879, p. 14. 



Trichogramma ? minuta Riley, 1871, pp. 157-158. fig. 72. 



Trichogramma ? minuta Riley — Packard, 1872, p. 8. 



Pentarthron minutum (Riley) — Idem. ib. 



Trichogramma pretiosa Riley, 1S79, pp. 161-162. 



Pentarthrum minuta (Riley), ibidem. 



Trichogramma pretiosa Riley — Comstoek, 1S79, pp. 193-194. 



Pentartliruni minuta (Riley) — Idem, ib. 



1. This statement should perhaps except minutiasitmum whose types are 

 probably still in existence. I have been unable to obtain possession of them, 

 or certain knowledge of their existence. 



2. The list of literature is omitted here. It will be given in a sequel, 

 published elsewhere. 



3 Though for the present retained as a species of Pentarthron the 

 latter will undoubtedly fall as a synonym of Triehogramma and the specific 

 namei of this insect will become of course Trichogramma minutum Riley as 

 originally. It would seem that the species has finally come back to its own. 



