OF WASHINGTON. 71 



in all stages. Adult females, eggs, and immature specimens in all stages 

 were found October 22, iSSi. 



Acanthococcini. Cerococcus quercus Comst. On Oak; Arizona. Ovip 

 arous; hibernates in the egg state. Scales received January, 1874, con 

 tained numerous eggs, which commenced hatching March 18, 1874. 



Gossyparia ulmi GrofT. On Elm ; D. C. This species appears to be 

 oviparous and hibernates in the larva state. 



Eriococcus azalea Comst. On Azalea; D. C. Oviparous; hibernates 

 in all stages. 



RkizococcHS qiiercns Comst On Live Oak; Florida. Oviparous; 

 hibernates in all stages. Among specimens received March 29, 1882, were 

 mature females, partly grown females, young larvae, eggs, and fully 

 developed males, which seems to indicate that there are two or more 

 generations each year. 



Rhizococcus araiicarifK Comst. On Araucaria ; California. Oviparous ; 

 the eggs were probably deposited in August or September. It hibernates 

 probably as partly grown larva. 



In discussing these several communications Mr. Doran stated 

 that at one time he had kept a Scarabseid beetle for five days in 

 a bottle containing fresh cyanide, and that at the expiration of this 

 time it was apparently as healthy as ever. Mr. Schwarz stated 

 that in his opinion the species of Lachnosterna are much longer 

 lived than supposed by Prof. Riley. Instead of dying in three or 

 four days, he thinks that they normally live for several weeks. 

 Dr. Marx stated that on May 10 he received a male and female 

 Centrums vittatus from Baltimore and placed them separately 

 in dry bottles. The male died in five days, but the female is still 

 alive, having given birth to numerous young. In this case the 

 longevity is plainly influenced by maternity. Mr. Howard 

 thought that the influence of Prof. Riley's cyanide was far from 

 being proven, and suggested that if the check bottles had con 

 tained an equal amount of moistened blotting-paper the compar 

 ative results might have been different. In regard to the instance 

 of the travelling of the young of the Chionaspis, he thought that 

 this was rather to be explained by the accidental portage of many 

 individuals by flying insects and by English sparrows, every 

 where so abundant. Mr. Ashmead stated that from observations 

 in Florida he was convinced that ants have a great influence in 

 the carriage of bark-lice to a distance. Prof. Riley stated that no 



