TAXONOMIC INVESTIGATIONS 
S. A. Rohwer, Senior Entomologist, in Charge 
Mr. and Mrs. R. C. Shannon returned to Washington on November 23 
after a two years’ sojourn in South America, where Mr. Shannon was em— 
ployed by the Argentine Government to work up the dipterous fauna of the 
country, with special reference to malarial problems. Mr. Shannon is 
planning to leave again for South America in January of next year, going 
this time to Peru, where he will spend about six months working on the- 
etiology of the disease verruga. This work will be carried on under the 
auspices of the International Health Board of the Rockefeller Foundation. 
Mr. Shannon expects to spend the first week in December working with Dr. 
H. G. Dyar on the determination of the mosquito material collected during 
his stay in South America, and the rest of the month in preparing himself 
for his work in Peru. 
Dr. F. E. Lutz, of the American Museum of Natural History, New 
York City, visited the Division on November 10 and 11, and spent some 
time studying centrine bees of the West Indies in the Museum collection. 
Prof. R. A. Cooley, of Montana State College, Bozeman, Mont., 
visited the Division of Insects on November 2 and 3 and examined tick 
parasites belonging to the genera Ixodiphagus and Hunterellus. 
W. H. Thorpe, of Cambridge University, England, while en route 
to Riverside, Calif., stopped off November 5 to 8, and made the acquaint— 
ance of workers in the Taxonomic Division. He spent some time working 
with August Busck on microlepidoptera. 
Dr. W. Schaus spent November 13 to 15 in Pittsburgh, working on 
the Lepidoptera collections in the Carnegie Museum. 
Alan S. Nicolay, of Upper Montclair, N. J., was a visitor to the 
Division in the early part of the month, looking over the material in 
the Coleoptera collections. 
Dr. Ahmed S. Hassan, of Facous, Egypt, who has been studying for 
the past several years with Prof. E. 0. Essig at the University of Cali- 
fornia, called at the Division of Insects on November 8. He was especial— 
ly interested in the methods of preparation and installation of the col- 
lection. 
Dr. J. R. Schramm, editor of the Biological Abstracts, recently 
visited the Division of Insects, consulted with the men in the Division 
who are acting as Section Editors, and arranged to have a list of genera 
of Diptera compiled from the card index in the Division for the use of 
abstracts in his office. The copying is now under way and will probably 
occupy three or four weeks. 
Dr. F. M. Root, of Baltimore, recently called at the Division and 
obtained Dr. H. G. Dyar's assistance in determining some of his mosquito 
collections from Venezuela. 
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