374 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1919. 
on by the closely related Bureau of Entomology. Material illustrat- 
ing life histories, the interrelations of insect species through parasit- 
ism and otherwise, and other biological phases of insect life is con- 
stantly accumulated by bureau workers; and after having served its 
immediate purpose as a basis for economic bulletins it is deposited 
in*the Museum. Thus there has been accumulated a biological col- 
lection which in parasitic Hymenoptera and Diptera, and probably 
in some other groups, far surpasses that of any other Museum in 
quantity of reared material. 
The fact that all of the Museum staff in the division have been 
more or less occupied with the rearing of insects in the course of 
economic studies has always kept the biological side uppermost in the 
division. 
PERSONNEL. 
(April 1, 1920.) 
Administrative : 
L. O. Howard, honorary curator.’ 
J. M. Aldrich, associate curator. 
William Schaus, honorary assistant curator.® 
Specialists: 
In Coleoptera— 
BE. A. Schwarz, honorary custodian.’ 
H. S. Barber.® 
Adam Boving (larve).? 
F. C. Craighead (larvee).? 
W. S. Fisher.® 
In Lepidoptera— 
H. G. Dyar, honorary custodian.* 
August Busck.* 
William Schaus.® 
Carl Heinrich.’ 
In Orthoptera— 
A. N. Caudell, honorary custodian.° 
In Hymenoptera— 
S. A. Rohwer, honorary custodian.’ 
A. B. Gahan.’ 
R. A. Cushman.’ 
William M. Mann.’ 
L. H. Weld.’ 
In Hemiptera— 
BH. H. Gibson, honorary custodian.* 
BH. R. Sasscer, scale insects.’ 
A. G. Baker, plant lice.® 
Harold Morrison, scale insects.* 
In Odonata and other Neuropteroids— 
R. P. Currie, honorary custodian.’ 
2On the Bureau of Hntomology staff. 5 On the Bureau of Plant Industry staff. 
4Voluntary, donating their services. 
