Assertion: mature nymph | /r/HasAspect | dark wingcases
Facets:
Source sentences:
text: For example, if your samples turn up good numbers of Hendrickson nymphs, but few or none are mature (mature nymphs have dark wingcases, although this is a little hard to see with some of the darker-colored Hendrickson nymphs), you are too early for significant hatching.