Jan., '07] ENTOMOLOGICAL NEWS. 13 



9 mm.; ovipositor, g mm.; width third femora at widest point, 4 mm. 



4 mm. 



Type in U. S. Nat. Mus. 



One female, Mesilla Park, New Mexico, August 12, 1898 

 (Cockerell). 



This species is very distinct from D. brevipes. The latter is 

 less variegated in color and the calcaria of the posterior tibiae 

 are not so conspicuously long. The claws of the new species 

 are proportionately much longer than those of brevipes, and 



Fig. la. 



the third tibiae are straight on the lower side instead of 

 slightly curved as in brevipes. The third femora of 

 phrixocncmoides are apically about one-third as broad as the 

 basal portion, while in brevipes the apical width is more than 

 one-half the basal width. 



Figure 1 shows the type specimen of phrixocncmoides, and 

 figure 1 a represents third leg much enlarged. 



A new Mayfly of the genus Caenis. 

 By Nathan Banks. 

 The genus Caenis is one of the most distinct in the Epheme- 

 ridae. Its species, however, being small, are little known. 

 Hagen recorded two species from the Eastern States, and 

 recently Dr. Needham has described a third. I have a new 

 species from the West, described below, and another form from 

 Florida. Dr. Needham has figured the wings of the three spe- 

 cies ; however, I do not find that there is as much difference in 

 the venation as would appear from his figures. He shows the 

 wing of C. hilaris with fewer cross-veins than C. diminnta, 

 and both without anal cross-veins, yet in all the specimens 



