OF WASHINGTON. 245 



antenna and a wart on each side of vertex bearing a row of black 

 bristles. Thorax with a broad white stripe in middle, dark brown on the 

 sides ; pleurae yellowish ; abdomen brown above, paler beneath. Antennae 

 pale yellowish brown ; legs rather paler, with manj- black spines; spurs 

 yellowish. Wings hyaline, with gray hairs; venation pale, irregularly 

 marked with brown, the cubitus and anal more heavily marked; ptero- 

 stigma rather distinct. Hind wings gray hyaline, venation brownish, a 

 brown dot in base of third apical cell; fringe, short and brown in both 

 pairs. 



Length, 16 mm. 



Several specimens, Prescott. June 19 to 25 (Oslar). 

 Type. In the author's collection. 



EXPLANATION OF PLATE IV. 



1. Psocus conspersus, wing. 



2. Hemerobius schiuarzi, male appendages. 



3. Hemerobius cockerelli, male appendages (inverted). 



4. Hemerobius perparvus, male appendages. 



5. Anabolina diversa, male appendages. 



6. Hemerobius umbratus, male appendages. 



7. Raphidia minuta* male appendages. 



8. Hemerobius pacificus, male appendages. 



9. Chauliodes filicornis, appendages, top view. 



10. Chauliodes filicornis, appendages, side view. 



11. Chrysopa schwarzi, head. 



12. Hydropsyche divisa, wing. 



THE GENERA OF THE DIPTEROUS FAMILY EMPIDID^, 

 WITH NOTES AND NEW SPECIES. 



By D. W. CoQUlLLETT. 



The present paper is an attempt to settle the type species of 

 each North American and European genus of Empididas, and to 

 bring some kind of system out of the present confused condition 

 into which the genera of this family have fallen. Our own fauna 

 is so similar to that of Europe that our students cannot well afford 

 to ignore the latter when working with specimens from this coun 

 try. Of the generic names adopted in the synoptic table given in 

 my Revision of the North American Empidas, comparatively few 

 changes are necessary ; thus Hemcrodromia includes more than 

 one genus, and this is also true of Tachydromia; Mantipeza 

 gives way to Chelifera* a much older name ; Rhamphomyia 

 gives place to the much earlier Macrostomus, as Sciodromia 

 does to the earlier Helcodromia j Syneches is replaced by the 

 much earlier Acromyia, as Cyrtoma is by the earlier Bicellaria. 



In regard to the earliest date of each genus, the rule has been 



