OF WASHINGTON. 163 



Francisco and Central American ports, and in September of 

 this year Dr. S. Austin Davis sent to Doctor Howard a female 

 specimen which was found on board of one of the Panama 

 Railroad steamers which ply between New York and Panama. 

 Mr. Schwarz reviewed the history of this genus and said that 

 he has come to the conclusion that the species is nothing else 

 than the old Rhipidius pectinicornis Thunb. From the fact 

 that the female has well developed legs and is provided with 

 eyes and normal antennae he concluded that the female leaves 

 the body of the roach and crawls about as any ordinary beetle. 



Mr. Sanders exhibited photographs of adults and larvae 

 of the scale Lophococcus mirabilis Ckll., which were received 

 from the northern Transvaal. They live on the acacia, the 

 thorns of which the adults mimic. The larvae resemble the 

 winged seeds of some plants, but are not believed to be mimics. 



The Secretary read notes from Messrs. E. O. G. Kelly 

 and T. D. Urbahns on some experiments with Lysiphlebus 

 tritici Ashm., the hymenopterous parasite of the spring grain- 

 aphis or so-called " green bug " (To.voptera graminum Rond.). 

 The breedings and rearings of this insect show that the species 

 will parasitize not only Toxoptera graminum but also various 

 other aphides Aphis setaricc, the cotton or melon aphis (A. 

 gossypii Glov.), the corn root-aphis (A. maidi-radicis Forbes), 

 the corn leaf-aphis (A. maidis Fitch), and the cabbage aphis 

 (A. brassier L.). The experiments, in detail, are as follows: 

 (i) Specimens of Lysiphlebus, reared from To.voptera, para- 

 sitized A. setaricc, their offspring (or the second generation) 

 parasitized To.voptera, and the third generation parasitized 

 A. setaricc, from which the adults developed. (2) Lysiphlebus, 

 reared from To.voptera, parasitized A. setaricc, their offspring 

 parasitized A. maidis, and from the latter the adults emerged, 

 (3) Lysiphlebus, reared from Toxoptera, parasitized A. maidi- 

 radicis ( ?) on Erigeron canadcnse, their offspring parasitized 

 To.voptera, and from the latter the adults developed. (4) 

 Lysiphlebus, reared from To.voptera, parasitized A. gossypii 

 on primrose and from these the adults developed. (5) 

 Lysiphlebus, reared from A. setaricc, parasitized To.voptera, 

 their offspring parasitized A. maidi-radicis ( ?) on Erigeron, 



