202 Annals Entomological Society of America _[Vol. VII, 
We found that many of the oils derived from crude petroleum 
attracted the males of the Mediterranean fruit fly (Ceratitis 
capitata Wied.), but rarely was a specimen taken in animal 
or vegetable oils. Our experiment with kerosene shows that 
of every thousand Mediterranean fruit flies captured only 
three, on an average, were females, the remainder being males. 
It is noteworthy to mention that the Queensland fruit fly 
(Dacus tryoni Frogg.) and the Mexican or Morelos orange 
worm (Anastrepha ludens Loew.) are not attracted to kerosene. 
The vegetable, animal and petroleum oils listed in the 
following table were poured in pans and placed upon the ground 
in a pumpkin patch which was swarming with melon flies. The 
number of pans used, the number of days each oil was tested 
and the results obtained are stated in the following table: 
TABLE XI. 
NUMBER OF MALE AND FEMALE MELON FLIES CAPTURED IN ANIMAL, VEGETABLE AND 
PETROLEUM OILS. 

Pans ‘Of 2 
(Citranetla, A543 ah: aoa a eae es 2 5 days t 2 
Vegetable oils {Turpentine............. PES EE 8 ee SU 1 16 hours 0 0 
COCCAanUE SS Fike ee Ree 2 5 days 0 2 
Animal oils Ala =) (eee eetteges Bech hare ceo ee 5 oy Sv 2 5 days 2 4 
(EES 5 i afraaco oo ch te See ee eee 2 5 days 1 1 
Kerosene about 120° Bé............. 3 5 days uy 3 
Petroleum oils ;Gasoline about 86° Bé............. 1 16 hours 0 0 
(Benzine\ aboutiiG3e Bet. 2.525 65. 1 16 hours 0 0 
6 2 
In all probability, the specimens were not attracted to these 
oils but came within the sphere of influence by accident, became 
stupefied and dropped into the oil. 
32. Night traps.—As the melon flies show a strong positive 
reaction to light, an attempt was made to capture the pest with 
anight trap. Herrick’s moth trap was placed in a pumpkin patch 
but not a specimen was caught. A seventy candle-power 
hunting lamp was placed above the moth trap and the light 
rays were directed towards thousands of melon flies resting 
under sunflower leaves in the pumpkin patch but not a single 
Specimen was attracted to the light. 
33. Poisoned bait spray.—Striking demonstrations have 
been made of the effectiveness of the poisoned bait spray in 
the control of the olive fly (Dacus ole Rossi) in Italy and France 
