I was really surprised by this book.
When Odonates (dragonflies and damselflies) mate, the male uses claspers at the end of the abdomen to latch onto the female by grabbing the back of the head, the female then arches her abdomen forward to bring the genitalia into contact (these Pondhawks are from yesterday):
But to prove my point about the colors, here's photos I've shot of Odes this spring (and summer)...
Red (Variegated Meadowhawk in mid-April):
Orange (Halloween Pennant yesterday):
Yellow - (Midland Clubtail in a jar destined to be a specimen):
Green - (Swamp (or less likely Elegant) Spreadwing damselfly):
Blue (Blue Dasher):
Indigo (Spatterdock Darner):
Violet (Slaty Skimmer - ok kind of a stretch, you'll just have to wait until I get a Variable Damselfly)
Basically, I'm now taking a net with me whenever I go birding (that ratio of only about a third vouchered holds for the above group for sure, I've collected one of most of them though the meadowhawk and spreadwing eluded me. Only the dasher and the clubtail have been captured in Berrien before and clubtails are really hard so I kept it too.) Right now at least, I'm actually targeting Odes more than birds!