1 MISC. PUBLICATION 318, U. 8S. DEPT. OF AGRICULTURE 
The order Homoptera subdivided into some of its families, genera, and species 
Order Family Genus Species 
gossypii. 
: maidi-radicis . 
ADDIS awe ee pomi. 
Trumicis. 
Aphiidaeress2 3 6 ea seeton FANUC DIS ee roseus. 
Breviconymes += Sates brassicae. 
ETLOSQTIUG see ee lanigerum. 
ae Mes Bae fe ee cee ae cerast. 
icadid aes Sten s vee oes Qg1ccOdg st = eee es septendecim. 
Homoptera - -_-------------- Cicadellidae [erspoase Paes eet ee maligna. 
oe Ais a PEGE TOME UT Gee eee ae comes. 
Membracidae=____________ CORCSO Sees ele ee bubalus. 
ios Remora res, Sec perniciosus. 
. LOMOS 1S apa ee teen furfura. 
Coceidae._-.-----.--.----- Lepidosaphes______-_____-- uli. 
POULTON 1 Ce vitis. 
Thus it can be seen that the cotton or melon aphid (Aphis gossypii) belongs to the family Aphiidae 
and the order Homoptera. 
FURTHER AIDS TO IDENTIFICATION 
Anyone who is sufficiently interested in insects to want to make 
a collection, will want to know the names of those collected. Because 
there are so many different kinds, it is almost impossible to prepare 
a simple key for identification that the average person can use, 
The best that can be hoped for in this publication is to acquaint 
club members with the larger groups of insects such as the orders. 
In some cases it is well to know the families, and, where the insect 
is of major importance, it is very helpful to be able to identify the 
species. 
INCHES 
4 5 6 
MILLIMETERS 
FicurE 24.—Rule for measuring insects. 
Instead of the usual key, a number of pictures have been used to 
assist in identification. In some cases the picture of a single insect 
is shown to represent an entire order, and in other instances the pic- 
tures represent the family also. Remember that there may be a thou- 
sand or more insects that are very closely related to the insect shown 
in the picture, and in many cases closely resemble it. Textbooks and 
bulletins may be used to help further in identification. 
Since a means of measuring is not always available, the rule 
sketched above should be useful. The upper portion is divided into 
inches, and the lower portion into millimeters. 
