42 Trans. Acad, of St. Louis 



September 10, 1918. They were first seen at twilight, and 

 they continued their travels after dark. Of this species 

 Dr. Wheeler writes: "The northermost point at which 

 this species has been taken in the west is Doniphan, Mo. 

 In the eastern states I have not seen the genus Eciton, 

 which is nearly neotropical and runs to Argentine, fur- 

 ther north than North Carolina. ' ' This shows that the 

 species is gradually working its way northward. 



PARASITIC AND OTHER HYMENOPTERA 



Pteronidea quercus Marl. [S. A. Rohwer], Found 

 alive and mature inside a hollow sumac stem at Wickes, 

 AprU 23, 1920 



Tromatohia rufopectus Cr. [R. A. Cushman]. One 

 egg-sac of the common green orb-weaving garden spider 

 gave forth during the summer of 1920 fifteen adults of 

 this parasite. Of the fifteen specimens, thirteen were 

 females. None of the spider 's eggs hatched. The para- 

 sites each had a separate cocoon, and these were closely 

 massed together within the spider's sac but surrounding 

 her eggs, but whether the parasites themselves spun the 

 material for their cocoons or merely wrapped themselves 

 snugly in the fluffy spider 's silk already at hand, I could 

 not tell. 



Epistenia osmiae Ash. [J. C. Crawford]. This Chalcid 

 parasite emerged from an elder twig on May, 21, 1918. 

 The twig had been taken at Meramec Highlands just the 

 week before. The tunnel had probably been originally 

 dug by Ceratina or Hypocrabro. 



Grotea anguina Cress. [S. A. Rohwer]. This parasite 

 was in a number of sumac twigs gathered for Ceratina 

 and Hypocrabro specimens, and is probably parasitic 

 upon one of these two species. The twigs were gathered 

 at Wickes in October, 1917. The silky white, transparent 

 cocoons of this parasite measured twenty mm. in length, 

 and were at the bottom of burrows, about four inches 

 deep, in the twigs. The adults emerged early in the fol- 



