1920] Crampton — Lines of Descent of Lower Winged Insects 127 



the Isoptera (with the Zoraptera) and Dermaptera is so evenly- 

 divided between the Blattoid and Plecopteroid groups that it is 

 only after careful consideration that one can make up his mind 

 where to place them. On the other hand, such strongly aberrant 

 forms as the Thysanoptera and Strepsiptera are also extremely 

 difficult to place, and until more is known of the embryology, in- 

 ternal anatomy, and further anatomical details of these forms than 

 is at present available as evidence for determining theii- closest 

 affinities, the groupings here proposed must be regarded as purely 

 provisional, and subject to further revision in the light of subse- 

 quent investigation. It may be stated, however, that none of the 

 facts thus far brought forward would indicate that the views here 

 proposed are untenable, and a further study of the forms in ques- 

 tion has in each case merely served to confirm the correctness of 

 the conclusions concerning the groupings here proposed. 



PROCEEDINGS OF THE CAMBRIDGE ENTOMO- 

 LOGICAL CLUB 



At the meeting June 8, 1920, Mr. Parker of the U. S. Entomo- 

 logical Laboratory atArlington, Mass., gave an account of the effect 

 of the hymenopterous egg parasite, Trichogramma minutum on the 

 European corn-borer in this country. Last year 28,000 eggs of 

 the corn-borer were examined and 43 per cent, were found parasi- 

 tized by Trichogramma. Collecting notes were read by several 

 members and notice was given of expected appearance of the 

 periodical Cicada at several localities in Massachusetts, Connecti- 

 cut and Rhode Island. It was voted to hold the next meeting on 

 the second Tuesday in September. 



At the meeting of September 14, 1920, Mr. C. W. Johnson read 

 a paper on the New England brood of the periodical Cicada and 

 its failure to appear this year. Mr. Johnson had visited the place 

 near the Logue reservoir in Washington, R. I., where the insect was 

 found in large numbers in 1903 as described by A. S. Packard in 

 Psyche for December of that year, but found none. He read a 

 letter from Mr. George Dimmock who visited the place at Suffield, 

 Conn., where he had collected the Cicada in 1869 and found none 

 at this time. Inquiries were made and letters received from the 

 following places where the insect was seen in 1903 without any 



