1910] Book Remew 
10.6) 
— 
so constructed as to allow considerable movement in a vertical plane, 
and even a folding-over of the end-sections on the middle ones for 
convenience in transportation. Such a machine can be readily made 
by a handy blacksmith, or a substitute therefor may be built of boards 
by any farmer, the principle remaining the same. ‘The front and 
rear edges of the iron plates should be stiffened with iron rods, and the 
front edge should be about two inches from the ground. ‘The runners 
should be of such form as to pass over minor obstructions on the ground 
and to permit movement backwards, for convenience. 
Such a machine, properly coated with “Tree ‘Tanglefoot’ and 
drawn by a horse over pasture and mowing-lands during the early 
stages of development of the “hoppers would capture them in large 
quantities, and in addition destroy myriads of leaf-hoppers (Jassidae), 
spittle-insects (Cercopidae), plant-bugs (Capsidae), and other grass- 
and grain-inhabiting insects. 
A MownoerarHic REVISION OF THE TwistED WINGED INSECTS 
CoMPRISING THE ORDER STREPSIPTERA Kirgy. By W. Dwight 
Pierce, Bull. U. S. Nat. Mus., No. 66, pp. 232, pls. 15; figs. 4. 
(Dec. 1909.) 
This extensive contribution represents the first attempt made to 
gather together and correlate the considerable amount of scattered 
information at present available concerning this most aberrant and 
interesting group of insects, and in addition it contains a large amount 
of new matter, relating principally to the North American members 
of the order. 
The Strepsiptera are regarded as an order, a view which will prob- 
ably receive the endorsement of other workers, although there are 
some such striking similarities between them and Rhipiphorid Coleop- 
tera that it is difficult to regard them with Pierce as more closely related 
to the Hymenoptera and Diptera. One point upon which much stress 
is laid, the presence of the group in Baltic amber of Tertiary age, 
‘annot carry conviction, for we know that in other specialized orders 
many amber species are almost indistinguishable from living ones. 
Following his preliminary classification of the Strepsiptera pub- 
lished in 1908! the author divides the order into four superfamilies 

1A Preliminary Review of the Classification of the Order Strepsiptera, Proc. Ent. 
Soc. Washington, Vol. IX, pp. 75-85. 
