1945] Chrysopidae of Central America 141 
there are several species which occur in the southern part of 
the United States. 
I have listed as “species” all forms that I could distinguish 
fairly definitely by color as well as by structure. The markings 
of the head and thorax and sometimes of abdomen are generally 
constant. There is always some variation, but it is often in 
extent or distinctness of development, rather than presence or 
absence. Specimens sometimes become discolored, and then it 
is difficult to determine face-marks. The study of male genitalia 
in this group will serve better to differentiate the species, but 
tends to neglect other structures which may be of value in de- 
fining subspecies, varieties, and races, which will surely follow 
more extensive studies. Taxonomy is not simply to show how 
species can be separated, but just as truly to show how they 
can be allied, — classified. Although the genitalia in many 
t groups are the most valuable in distinguishing forms, one should 
remember that in Nature no species is kept separate by the 
structure of its genitalia. 
The name Chrysopa is a pure synonym of Hemerobius, and 
no scrapping of rules can change that fact. But until Chrysopa 
can be split into a number of genera (only one small one will 
have to take the name Hemerobius) I shall utilize the old name. 
Rambur a hundred years ago provided a name for the Heme- 
robius of McLachlan and Hagen. 
Key to Genera 
1. Third cubital cell not divided; costal area very broad; no 
regular series of gradates; five or six branches of radius beyond 
subcosta; radials often connected by cross-veins . Apochrysince 
Third cubital cell divided in some way; costal area much 
narrowed at stigmal area; rarely more than three branches to 
radius beyond subcosta; cross-veins in middle area mostly in 
two or three series Chrysopinoe 2 
2. Antennae on basal half, at least, with the joints plainly 
broader than long; 
a — Thorax moderately slender; antennae with basal joints 
rather widely separated, and slender; in male with a 
process between antennae Meleoma 
b — Thorax broad, basal joints of antennae stout and little 
separated, no process between them; in hind wing 
branches of anal often forked Nadiva 
