Thoughts ou the Hymenoptera Trichogrammatidae etc. 81 



time we can actually trace the dispersa! of these insects from continent 

 to continent gives evidence that its method is quite efficient for the 

 purpose and to prove that some such manner was the natural way 

 centuries ago, all that is necessary is to prove that the wind blew 

 centuries ago, that man existed then, fed upon plants, roamed about 

 and migrated; that our ignorance in regard to means of dispersa! is 

 profound; that species then still had the tendency to increase indefini- 

 tely and to extend their habitat; that plants were transported from 

 place to place by animals and otherwise and fruits by birds and that 

 an enormous time has elapsed. For the mJgration must have gone 

 on very slowly. I think all of these facts are admitted. Can human 

 reason find any other explanation to fit the facts? Thus, species either 

 have or have not originated at one place and dispersed therefrom; 

 if We conclude that they have not, we not only must deny a legion of 

 facts but base the concluson an a priori grounds; but to conclude 

 that they have is to satisfy reason based on experience the only method 

 whereby truth is known. 



11. Criticism of My Table of Genera to the Family. 



I have sent in a manuscript to be published in the Bulletin of the 

 Wisconsin Natural History Society, giving a new, and in my opinion, 

 better arrangement of the groups of the Trichogrammatidae and since 

 I have been informed that it will not be possible to see the proof of 

 this paper before it is published the oppurtunity is taken in this 

 connection to correct some unfortunate errors discovered after the 

 manuscript had been mailed. 



Since, I have worked up the Australian fauna as repressented 

 by this family and while doing so noticed the errors in my former 

 descriptions of certain genera; these have been noticed above but I 

 again consider them in respect to this paper on the genera. In the 

 tribe Chaetostrichini, the genera Brachistella, Ittys and Abhella should 

 beremoved from their position in the table to form a first section, headed 

 ,,Antennae 9-jointed, with 2 ring-joints, the funicle 2-jointed". A 

 second section headed ,,Antennae 8-jointed, with one funicle Joint", 

 should include the gemis Brachista, while a third section headed ,,An- 

 tennae S-jointed, with 2 funicle joints" should consist of the genera 

 Ufens and Japania; the other sections follow as in the table. It should 

 be further noted, however, that the ovipositor of Pterygogramma 

 Perkins is not exserted and that this genus should follow Uscana 

 in my table. 



12. Criticism of Perkins' View Concerning the Relations 

 of the Oligositinae of Ashmead. 



Although, I certainly agree with Doctor Perkins (Bull. No. 1, 

 Division of Entomology, Hawaiian Sugar Planters' Association, 

 Honolulu, Part VI, p. 192) when he implies a close relationship bet- 



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1913. A. 1. O 1- Heft 



