164 ENTOMOLOGICAL SOCIETY 



and the adults from the latter parasitized Toxoptera, from 

 which the adults emerged. (6) Lysiphlebus from A. setaria 

 parasitized A. maidls, from which the adults were secured. 

 (7) Lysiphlebus from A. brassicce parasitized Toxoptera, from 

 which the adults were secured. (8) Lysiphlebus from A. 

 gossypii on cotton, sent by Mr. C. N. Ainslie from Mesilla 

 Park, N. Mex., parasitized Toxoptera and from the latter 

 the adults emerged. 



The Secretary read also a note from Messrs. Kelly and 

 Urbahns describing experiments showing parthenogenesis in 

 Lysiphlebus tritici Ashm. Starting with a virgin female 

 Lysiphlebus (the offspring of a fertilized female), issuing 

 from a parasitized Toxoptera that had been placed in a vial, 

 101 of the offspring were males and 6 were females, each issu- 

 ing in a separate vial. Four of these females were allowed to 

 parasitize Toxoptera, and their offspring were all males. 

 Starting with a supposedly fertilized female, a virgin female 

 offspring was isolated; the offspring of this latter female 

 comprised 69 males and 3 females, and the offspring of one of 

 these 3 virgin females were 5 males and 2 females. One of 

 the last-mentioned females, unfertilized and parasitizing 

 Toxoptera, produced 51 males, while the other produced 15 

 males. In numerous cases no females were produced, in one 

 instance the offspring of a single virgin female being 186 males. 



Mr. Schwarz said that a species of Spirobolus, a millipede, 

 has transformed a thick layer of fallen leaves into a granular 

 mass of excrement which covers the ground between the rocks 

 along the upper Potomac River to a considerable depth. In 

 some localities there is practically no soil except this layer of 

 excrement. 



The following papers were presented for publication : 



BRASSOLIS ISTHMIA, A LEPIDOPTEROUS INSECT 



HIGHLY INJURIOUS TO COCOANUT CULTURE 



IN THE PANAMA CANAL ZONE. 



BY HENRY F. SCHULTZ. 



Early in May, 1906, on my arrival on the Isthmus, I found 

 the majority of the cocoanut trees in this neighborhood de- 



