383 
the name of Scaptomyza by the English entomologist, Hardy; but the 
best authorities on this subject accord it only subgeneric rank. 
Although no experiments have as yet been made in this direction, 
so far as we can learn, still there is a possibility that the attacks 
of this insect may be prevented by sprinkling the plants with Paris 
green and water, at the rate of 1 pound of the poison in 200 gallons 
of water, first mixing the former with an equal quantity of freshly 
slaked lime, adding water to the mixture, and allowing it to stand for 
several hours before using. The addition of the lime is for the purpose 
of rendering the poison harmless to the plants. It will, of course, be 
advisable to make the application before the plants have been attacked ; 
Fig. 41.— Trypeta fratriq: a, larva: /. adult— enlarged ; c, d. e, anterior and posterior extremities 
of larva — still more eolarged (original). 
after once the larvae have made their way to the interior of the leaves 
it will be difficult to reach them by means of any external application, 
although there is a possibility that even then a penetrating liquid like 
the kerosene emulsion might find its way to them and accomplish their 
destruction. 
THE PARSNIP LEAF MIXER. 
So little attention has been given in the past to a study of the life 
histories of our Diptera that the early stages of only a very limited 
nunioer are at present known. An extended search through the pub- 
lished records has failed to bring to light a single fact bearing upon the 
