OF WASHINGTON. 81 



Ephemerida, Trichoptera, Lepidoptera, Mecoptera, Siphon- 

 aptcra, Diptera, and Hymenoptcra. From the Neuroptera, 

 as generally understood, he separates the Sialidce, which he 

 makes, with its relatives, an order under the term Platyptera. 



The paper was discussed by Messrs. Banks, Gill, and Ashmead. 

 Mr. Bank's remarks were critical as to certain details. 



Dr. Gill criticised the form of illustrative diagram used by Dr. 

 Smith and referred briefly to Haeckel's general classification of 

 the animal kingdom which has just been published. Mr. Ash- 

 meacl also criticised certain details, but expressed himself as 

 agreeing rather closely with Dr. Smith's general conclusions. 

 Dr. Gill further stated that in his opinion the brain will even 

 tually be used as a basis for classification as in other groups, 

 referring to recent work in this direction by Viallanes. 



Mr. Hopkins presented a paper of which he has submitted 

 the following abstract : 



NOTES ON SCOLYTID^, WITH DESCRIPTIONS OF NEW 



SPECIES. 



By A. D. HOPKINS. 



[Author's Abstract.] 



The speaker described the adult of Pityophthorus frontalis 

 n. sp., and also described its galleries. It infests dead oak twigs 

 on living trees of the red, black, and swamp oaks. He also de 

 scribed the adult and the galleries of Pityophthorus fagi n. sp. , 

 which infests beech twigs. He further described Thysanoes 

 querciperda n. sp., and T. obscttrus n. sp., the former infest 

 ing oak twigs and the latter hickory twigs. With regard to the 

 genus Micracis, he showed that the secondary sexual characters 

 are reversed from LeConte's descriptions. 



Mr. Schwarz congratulated Dr. Hopkins upon his discoveries 

 and spoke particularly of the extraordinary invasion of Den- 

 droctonus frontalis into the pine forests of West Virginia and 

 surrounding States, stating that in his opinion it was one of the 

 most interesting phenomena of recent times. A rare species 

 suddenly made its appearance, spread like wild fire for two 

 years and disappeared like a stroke of lightning ! He was 



