REPORT OP DIRECTOR AND STATE GEOLOGIST 1900 rl97 



Jos6 scale, together with the studies of this scale insect and 

 allied forms, the latter of which will appear in an illustrated bulle- 

 tin, giving the characteristics, life histories and treatment of the 

 several species. 2) Studies of forest insects. Extensive collec- 

 tions of injurious species were made in the Adirondacks, about 

 Albany and on Long Island, and the results will be prepared for 

 publication shortly. 3) Work on aquatic insects by Dr Needham 

 of Illinois at the entomologic field station, which was a bio- 

 logic, ecological and systematic study, giving particular atten- 

 tion to species of economic importance as food for fishes. The 

 results will appear in a well illustrated bulletin. The number 

 and character of the publications of the ofiice, the extension work 

 by lectures and exhibiting a collection of insects of economic 

 value, the additions to the collection, the work of the voluntary 

 observers and assistance received from others are also mentioned. 

 Two injurious insects, the gypsy moth, Porthetria dis- 

 p a r , and the palmer worm, Y p s o 1 o p h u s p o m e t e 1 1 u s , 

 are treated of in a general way. The account of experimental 

 work with insecticide® gives in detail the work with kerosene, 

 crude petroleum, whale oil soaps and hydrocyanic acid gas and 

 the effects of these substances on both fruit trees and insects, 

 particularly the San Jose scale. The results obtained were very 

 promising for crude petroleum emulsion. The notes for the year 

 give some of the more interesting facts concerning the following 

 insects: fruit tree bark beetle, Scolytus rugulosus, 

 plum curculio, C o n o t r a c h e 1 u s nenuphar, pale striped 

 flea beetle, Systena taeniata, elm leaf beetle, 

 G a 1 e r u c e 1 1 a 1 u t e o 1 a , gold gilt beetle, C h r y s - 

 ochus auratus, 12-spotted asparagus beetle, C r i o c e r i s 

 12 -punctata, grain beetle in linen, snakeworm, S c i a r a 

 species, forest tent-caterpillar, Clisiocampa disstria, 

 fall army worm, L a p h y g m a f r u g i p e r d a , red-banded 

 leaf-roller, L o p h o d e r u s t r i f e r a n a , harlequin cabbage 

 bug, Murgantia histrionic a, juniper plant bug, 

 Pentatoma juniperina, elm bark louse, G o s s y - 

 p a r i a u 1 m i and grasshoppers. 



