DIPTERA— PHORIDiE. 39 



there, which seems most unHkely, except the Sciara and possibly 

 M. discoidea. 



Those near the mouth in winter seem more or less dormant, depending 

 upon the degree of cold, but they do not seem as dormant as the Anopheles 

 and do not remain in the dormant state throughout the winter to the 

 extent that Anopheles does, for a rise in temperature causes them to 

 become very active again, while Anopheles does not respond readily to 

 a change in temperature during the winter. These Diptera are probably 

 hibernating and many of them at least leave the cave in spring, but 

 others are seen well within the cave at all times. It seems to me very 

 likely that Bolitophila hybrida, Mycetophila umbraticus, and Mycetophila 

 o6scHra breed within the cave, but their larval stages were not identified, 

 although many unknown larvae were found. 



Family CECIDOMYIDAE. 



Diplosis sp. 



A single specimen taken in the cave beyond the mound. 



Family DOLICHOPODIDAE. 



Liancalus genualis Loew. 



LOEW, Neue. Beitr., vili, 70 (Middle States). Aldrich, Cat. N. A. Dip., 1905, 298. 



A specimen of this species was taken on the wall at * '2" in September. 



Neurigona sp. 



A specimen was found near the mouth during October and another 

 individual of this family was found on the w^all at "3." 



A species of this family was recorded from one-half mile within 

 Diamond Cave, Kentucky, by Packard (1888, 80). Flies of this family 

 live in damp places, often with rank vegetation. They breed in decaying 

 organic matter. 



Family PHORIDAE. 



Aphiochaeta (Phora) nigriceps Loew. 



Loew, Cent., vii, 99 (District of Columbia) . Aldrich & Blatchley, Rep. Ind. Geol. 

 Surv., XXI, 1886, 190 (Wyandotte Cave^ Aldrich, Cat. N. A. Dip., 1905, 337 

 (all eastern United States). 



Fairly common. It is found in all parts of the cave. It is not more 

 common, at least, in twilight than in absolute darkness, and has been 

 more often noticed in the part of the cave through which the stream 

 runs. It is often seen on the wall or flying about the light, but is usually 

 on the floor or under a stone. It is quite generally attracted to the bait 

 left under stones, and has been seen at a dead mouse on two occasions. 



