14 ENTOMOLOGICAL SOCIETY 



Mr. Barber exhibited male, female, larvae, and photo- 

 micrographs of Ignotus anigmaticus Slosson, which had been 

 received from Mr. Blanchard and Mr. Joutel. He said that 

 Mr. Blanchard had a fine series of drawings made by Mr. 

 Joutel, which he hoped would soon be published. Mr. 

 Schwarz stated that Ignotus is the first instance in the clavi- 

 corn series of Coleoptera where there are neither elytra nor 

 wings in the female. 



Mr. Couden exhibited a specimen of the peculiar larva first 

 described and figured by Mr. Barber in Volume vn, pages 

 117-121 of the PROCEEDINGS of this Society. Mr. Couden said 

 that this specimen was found in the collection of the U. S. 

 Department of Agriculture. It was sent in from California 

 by Mr. Coquillett a number of years ago. When found, it 

 bore the label " Nitidulid larva." Mr. Schwarz said that he 

 did not believe that it was a nitidulid. Mr. Barber exhibited 

 photographs and slides of his specimens. 



Mr. Heidemann exhibited some Hemiptera-Heteroptera 

 sent him by Mr. J. R. de la Torre Bueno from New York. The 

 specimens were not in good condition for examination, but 

 they appear close to the European species Stygnocoris rusti- 

 cus Fallen, and probably belong to that species. The genus 

 Stygnocoris has not been recorded from North America 

 before. 



The secretary then read the following papers by Mr. 

 Ainslie : 



TETRASTICHUS AS A PARASITE ON POLYGNOTUS. 



By C. N. AINSLIE. 



[Hymenoptera.] 



The exact position of Tetrastichus in the field of parasitism 

 has been the occasion of much discussion among students of 

 insect economy. Certain investigators have claimed it to be 

 in every case a secondary parasite, while others, with a dif- 

 ferent viewpoint, insist that, in the case of the Hessian fly at 

 least, it is a primary enemy. Two species of Tetrastichus, 



