2O ENTOMOLOGICAL NEWS [Jan., 'l2 



Posterior wing slightly lighter in color than the anterior ; approxi- 

 mate shape, half an ellipse cut longitudinally. Venation, yellow- 

 brown, the median vein being very strong and thick. Costa extremely 

 strong, with hamuli extending from the center of the costa about half- 

 way to the apex. Cross-veins entirely absent except for a small one 

 near the base. Both outer and inner margins fringed with long soft, 

 black hair which increases in length to the base of the wing, where 

 it is fully as wide as the attachment itself. 



Length of body, 6 mm. Alar expanse, 17 mm. 



Collected at Permelia Lake, Mt. Jefferson, Oregon, July 

 1 6, 1908, by Prof. J. C. Bridwell. 



In the latter part of June, just after the preceding was writ- 

 ten, a few specimens of this same species were captured by 

 Mr. A. J. Stover, at Colorado Lake, an arm of the Willamette, 

 near Corvallis. After making sure of its identity with M. 

 alafimbriata, an attempt was made to find larvae and pupae. 

 A number of small, slender pupal cases were suspected 

 and rearing proved them to be undoubtedly the new spe- 

 cies. Larvae were also found. 



The adults at Colorado Lake appear about 5 or 6 o'clock in 

 the evening, in swarms, and dance and hover above the water 

 with dizzying pertinacity. Except accidentally, they do not 

 seem to alight, nor to touch one another. They hover di- 

 rectly above where the larvae and pupae are found, but could 

 not be detected in the act of oviposition. 



Pupa : The pupal cases are found attached to floating logs 

 or snags in Colorado Lake. They resemble the larval cases. 

 The well-developed pupa has extremely long antennae like 

 the adult. These curve back above the eye, slant across the 

 black wing and down to the posterior end of the abdomen, 

 where their surplus length is coiled into a curl, through 

 which the tips finally project backwards. Length of pupa 8 

 mm. 



Larva: The larva is a very small, slender, but extremely 

 active creature with comically long hind legs. These it places 

 in advance of the middle pair, in walking, making it appear 

 as though the middle legs were longer than the hind legs. 

 Upon close inspection, however, the latter are seen crossing 



