March, 1921] Macro-Fauna of Mirror Lake 169 



Hypera punctatus Fab. One specimen of this terrestrial snout 

 beetle was accidentally found here. 



Phytonomus nigrirostris Fal5. Two specimens of this clover pest 

 were also found here, probabh' ha\-ing been blown in during a migration 

 over the pond. 



Order Diptera. 

 The number of forms of aquatic Diptera found in Mirror 

 Lake, among families other than Chironomid^, may seem rather 

 small. As far as this is an actual incompleteness in the list, it is 

 due to practical difficulties that existed. No adults were cap- 

 tured or even noticed, so that, unlike for most other orders of 

 insects, no adults were available for identification, except for 

 a very few which happened to breed out in the laboratory. 



Family TipuUdce. 



Only one larva belonging to this family was found, (at 

 station 3). It was immature and could not be identified even 

 to genus. 



Famih' Cidicidce. 



Mosquitoes were not common. Probably the situation was 

 not especially favorable for them. Certainly in the large pond, 

 the fishes must have almost prevented the existence of .the 

 wrigglers, but in spite of that a few specimens were found 

 along shore at stations 6, 7 and 9. Dr. Dyar suggested that 

 few species were represented because all were collected late in 

 summer. However, since collecting was done similarly from 

 spring to fall, any other species that might have been present 

 must have been very rare to escape detection completely. 



Anopheles was the kind which comprised the largest num- 

 ber of individuals, almost two-thirds of all mosquito material 

 collected. As only larvae, and a few pup« were available, the 

 species could not be determined with assurance, though Dr. 

 Dyar wrote that probably it was a mixture of both Anopheles 

 punctipennis Say and Anopheles quadrimaculatus Say. 



Anopheles punctipennis Say*. One adult mosquito of this 

 species was secured just as it had freshly emerged at station 11. 



Uranotaenia sapphirina O. S. This species w^as next in indi- 

 viduals. About half as many larvae were found as of Anopheles. 

 The species is not a troublesome one, but Dr. Dyar said he 

 was attacked by one once. 



* Identified by Prof. J. S. Hine. 



