456 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 17 
Upon arrival at Sydney all consignments were met by a member of 
the Board’s staff and escorted on the mail train to Brisbane. 
Extent and Nature of Operations in North America 
During the work in North America, Uvalde and Brownsville, Texas 
and Miami, Florida have served as field headquarters. Natural enemies 
sent by co-workers from Arizona, California, New York, and northern 
Florida have also been handled at one or more of the above temporary 
laboratories. Aside from these areas, other regions of the continent 
have been scouted for cactus enemies and deserve mention here. 
During early spring a ten-day period was spent in inspecting cactus 
in the vicinity of Los Angeles, California. Nothing of special import 
was found. 
During the summer of 1922 the writer spent a fortnight in inspecting 
southern Arizona and the State of Sonora, Mexico. Little prickly- 
pear was found, and Moneilema, Narnia , cochineal, and Chelinidea were 
the principal insects encountered. The Chelinidea bug proved new to 
science. 
The urgent need of exact information regarding the cactus insects of 
Mexico led to more extensive field examinations during November, 1923. 
The writer and Mr. E. Mortensen visited the following points: Monter¬ 
rey, San Luis Potosi, Mexico City, San Juan de Teotihuacan, Tepepam, 
Tlalpam, Guajamalpa, San Angel, and Cuernavaca. Mr. Mortensen 
later visited Tampico and Victoria in the State of Tamaulipas. The 
findings are worthy of brief discussion. The box of collected specimens 
posted to Brownsville, Texas was greatly delayed, and upon receipt 
larval specimens were in such poor condition that they soon died. 
They must therefore be referred to without scientific names. 
At Tepepam, D. F., on November 13 the writer collected reddish 
lepidopterous larvae feeding gregariously in prickly-pear. A single 
larva of like kind was also taken by the writer at Cuernavaca, Mor. 
On November 13 near Tlalpam, D. F., the writer found small lepi¬ 
dopterous larvae feeding gregariously within the terminal joints of a 
tomentose prickly-pear. The larvae were whitish with black spots above. 
From 25 to 50 individuals lived in close proximity within a small cavity. 
Excrement in pellet form was pushed through several small holes to the 
exterior where it collected in a light web and obscured the entrance 
holes. 
Mr. E. Mortensen found at Guajamalpa, D. F., on November 19 
white lepidopterous larvae living gregariously within a thick-jointed 
