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D.W. Coquillett. Revision of the North American Empidae, [[strikethrough]] - [[/strikethrough]] a family of two-winged insects. 
Proc. U. [[strikethrough]] D [[/strikethrough]] S. Nat. Mus., XVIII, No. 1073, pp. 387-440.
An analytical key is given to the 34 genera of this family recognized as occurring in North America, 4 of which are described as new. 12 genera have analytical keys to their species and 66 new species are described.

Transcription Notes:
- There're underline under 'Proc. U. S. Nat. Mus. - There's a circle around '12' in the text.

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