— 106— 
piled, and be abundantly illustrated with colored figures. Work with 
this object in view was steadily continued for a time. Prof. Riley and I 
worked as well as we could apart, on the lines agreed upon between us, 
and a great lot of manuscript was gradually accumulated which it was 
intended should be worked up and completed when we could get at the 
labor together. 
The opportunity for this closer co-laboration seemed to offer when 
I became Assistant Curator in the Vepartment of Insects of the U. S. 
National Museum at Washington, but I soon found myself fully em- 
ployed otherwise, and Prof. Riley, what with ill health and his numerous 
other duties, found less and less time to give to the conjoint work, so 
that the monograph originally proposed was never completed. Aside 
from these considerations, other influences helped to dampen our ardor 
in prosecuting the work to final issue. One was Prof. Riley’s excessive 
caution and the desire of getting at a the information known and un- 
known concerning a species, which tended to check rapid work, the 
other the difficulty, if not impossibility, of getting a sufficient appro- 
priation for the publication of a monograph so elaborately illustrated as 
we had planned this should be. 
I found time however, in the midst of other work to prepare a 
number of descriptions, and to make use of the excellent library facilities 
at hand, and accumulated a great lot of material of use when systematic 
work should again become possible. When, recently, I accepted the 
position of Professor of Entomology at Rutgers College and Entomo- 
logist to the Agricultural Experiment Station of New Jersey, it was 
agreed between Prof. Riley and myself that the joint work as originally 
planned should be abandoned, and that, while mutual co-operation 
should continue, the results should be published as most convenient. 
It was realized that the fauna is not yet sufficiently known to enable a 
work to be carried on for several years without antiquating the beginning 
before the end was reached, as new material from new regions was con- 
stantly turning up. In consequence I shall, under the title of this paper, 
and the sub-title of the particular genus or group treated, publish as fast 
as they can be revised, the studies made by me on the ANoc/uide, omitting 
only certain special groups and genera which Prof. Riley has more par- 
ticularly worked upon. No particular order will be observed, and no 
one publication will be selected for all the papers, but so far as possible 
each paper will be complete in itself, save when special considerations 
render advance publications of fragments desirable. The material npon 
which these studies are made is principally in the National Museum, 
but Messrs. Hy. Edwards, E. L. Graef, Geo. D. Hulst, B. Neumoegen, 
Fred. Tepper, A. W. P. Cramer, J. Doll, Geo. Frank, and many others 
ee Se 
