
dc Ye 
FRUIT AND SHADE TREE INSECTS 
Fruit flies regurgitate food.—-James Zetek, Panama Canal Zone, en- 
gaged in experiments in control of the fruit flies Anastrepha fratercu— 
lus Wied., A. striata Schiner, and A. serpentina Wied. with various poi- 
soned baits, says: "It was noted that in every case, and in all of the 
three species, the flies fill up on the sweet bait and then start to re- 
gurgitate it in form of droplets, walking as they do this, sometimes in 
spirals, so that the tiny drops resemble egg spirals of Aleurocanthus 
woglumi Ashm. Then the flies start to drink these droplets and all of 
them quickly disappear. Sometimes two or three individuals start to 
fight over these droplets. This regurgitation is not confined to noi- 
soned baits. The flies regurgitate also when fed on water and molasses 
or sirup. They do it when feeding on a slice of orange. Some authors 
have maintained that regurgitation is due to too much arsenical in the 
bait, but in so far as our species are concerned, this is not so." 
Longevity of parasites of the Mediterranean fruit fly.--A. C. Mason, 
Honolulu, T. H., reports as follows on his investigations of the parasi- 
tes of Ceratitis capitata Wied.: "Parasite feeding and holding tests 
have been continued, with the view of determining the best methods of 
handling during prolonged periods. OQpius humilis Silv. shows a remark— 
able longevity when given food and water and held at room temperature 
Specimens are alive after 85 days, when fed on honey and cube sugar and 
kept in glass tubes or in a wooden cage. Honey agar maintained them 
for 65 days and is a satisfactory food when supplemented with water. 
Similar tests with Diachasma tryoni showed a longevity of 50 days on 
honey agar, 45 days on cube sugar, and 59 days on fresh honey and wa- 
ter. When kept in glass tubes in the cold room (44°; to. -50% my) the 
parasites have also shown the ability to withstand long periods. No 
feeding and little activity take place here. One Opius withstood 38 
'days' continuous holding without food, and died on the 39th day. When 
removed to room temperature and fed for 24 hours at the end of each 
holding period of 6 to 10 days, the parasites have lived in the cold 
room for 66 to 72 days, with a mortality of less than 50 per cent. When 
the holding periods are in excess of 10 days mortality is greater, reach-— 
ing 50 per cent at about 14 or 15 days continuous holding. Diachasma 
tryoni shows a higher mortality under similar tests, but small percent— 
ages have survived 60 to 7 days, when removed and fed at intervals of 
6 to 10 days; 50 per cent mortality is reached after about 30 days. Con- 
tinuous holding in the cold room showed a final survival of 22 days and 
50 per cent mortality after about 14 days". 

Carbon disulphide emulsion toxic to larvae of pecan weevil in soil.—— 
7. L. Bissell, Experiment, Ga., reports that "Fully developed larvae 
of the pecan weevil (Curculio caryae Horn) were dug from soil beneath 

