CEVTER OR TRAN SWAMEA, 
UNITED STATES DEPARTMENT OF AGRICULTURE, 
DIVISION OF ENTOMOLOGY, 
Washington, D. C., April 26, 1897. 
‘Srr: I have the honor to submit for publication the accompanying technical bul- 
letin, which it is hoped will enable all entomologists as well as all other persons who 
have access to a compound microscope to distinguish definitely between the San Jose 
scale and its closest allies. This bulletin has been prepared under your authoriza- 
tion by Prof. T. D. A. Cockerell, whose long technical study of the scale insects has 
especially fitted him for the work. Although the specific characters of the San Jose 
scale have been given in a number of different publications, they have not been dis- 
played by exact contrast to those of the most closely allied species, and it has resulted 
that almost all of the entomologists in the United States have felt themselves nnable 
to decide authoritatively as to the identity of suspected forms, and have always for- 
warded specimens either to this office or Professor Cockerell in New Mexico for cer- 
tain determination. It is the hope and expectation of the author of the bulletin and 
of the writer that by the aid of this account of the insect and its allies all of this 
uncertainty will be done away with and that much valuable time will be saved. 
Respectfully, nose 
. O. Howarp, 
Hon. JAMES WILSON, Lntomologist. 
Secretary of Agriculture. 
CONTENTS: 
ie Page 
The preliminary examination Aes ° so: .2s'saseeee ose come ow sete nator eee 3 
Rherstudyrof the SCA a. cece ese reraer = ee steels Oe ee eee eee ere 4 
The microscopic characteristics of the adult females. ...-.....-.....--..----- 5 
Mheisubrenera and sectionsiof Aspidiotus5-2--)s-5=e =e os ee ee eee 9 
ihe relationships of the San. Joselscalesa2..22- 5 sea ae eee ee eee 14 
Habits of the ispecies )./.... steelers cis o6 sosidoaistes icin sh ieeere See as ae SORE Eee 1b 
Annotated list of the species of Aspidiotuss2.25-2-->ssseo- eee eee eee eee 18 
IPROSUS CLE PU ya 22 sare alanis ei dicicie sleicie Cts iol sere (a) is are SENS Te oo me ote orerepe alone tetenetetet ol 
2 
