THE CANADIAN ENTOMOLOGIST. 165 



from some unknown reason produces a blue sensation in the eye. 



To sum up briefly, it appears to me that there is very little 

 evidence in favour of any theory except the old and hitherto un- 

 questioned one, that the blue colour of these butterflies is due to 

 internal colouring matter, probably a dye of some sort, since, as 

 far as I know, pigments, properly so called, do not show compli- 

 mentary colours when seen by transmitted and reflected lights. 

 The presence of the dark background is probably for the purpose 

 of cutting out all transmitted light which might give a yellow tinge 

 to the blue, and to hide the variegated pattern of the underside, 

 which otherwise, owing to the transparency of the blue scales, 

 would be visible through them and finally to give a greater depth 

 to what would otherwise be an extremely pale tint. 



(Read before Montreal Branch Ent. Soc. of Ont., Feb. 20,1915.) 



FIELD NOTES AND QUESTIONS. 

 New Jersey Nursery Insects For 1914. 



The following is a list of the commoner species found in New 

 Jersey nurseries. Most of them are confined to ornamental stock, 

 inasmuch as this class of plants occupies 2400 acres out of an 

 acreage of 2600 for all the nurseries, the remaining 200 being 

 planted to fruit stock, bush berries and strawberries. 



Aspidiotus perniciosus Comst. Light infestations on left over 

 fruit stock, mountain ash, hawthorn, currants, gooseberries, 

 Cornus sajiguinea, Aronia arbutifolia, Chinese privet, standard 

 privet, Spirea sorbifolia, snowberry. 



Lepidosaphes ulmi Linn. Increasing in importance and 

 numbers. Does far more damage than the San Jose Scale. Found 

 principally on lilacs, poplars and willows. 



Gossyparia spuria Mod. on elm. Chionaspis euonymi Comst. 

 on euonymus. Aspidiotus forhesi Johns, on cherry. Pissodes 

 strohi Peck, more abundant than usual in white pine. 



Scolytiis rugulosiis Ratz. common in left-over and neglected 

 peach and cherry stock. Cryptorhynchus lapathi L. in poplars and 

 willows. Agrilus viridis Linn. var. fagi Ratz. fairly abundant in 

 Rosa rugosa. Agrilus sinuatus Oliv. in pear, scarce. 



Galerucella luteola Mull, on elms. Cyllene rohinicB Forst. in 

 locust. Melasoma scripta Linn, present in small numbers on 

 poplars and willows. Podosesia syringcB Harr. in lilacs. Macro- 



