42 



FAUNA OF MAYFIELD'S CAVE. 



FIG. 7. Pupa of Oecothea fenestralis, 

 Dorsal view. X 15. 



December 16, 1903, from a piece of cheese which had been left as 

 bait at "41," several larvae and part of the bait were taken from the cave 

 and stopped up in a bottle. January 8, three larvae were separated 

 from the others. These must have been eggs or very small larvae when 

 taken, as others from the same material had emerged before. January 8 

 one was drawn (fig. 6). The next day one of the larvae pupated. 

 January 11 a second pupated, and on the 15th the third. The pupae were 



kept with dirt slightly moist. 

 February 2 two flies were in 

 the bottle. The third pupa had 

 died. One pupa was drawn in 

 several positions (figs. 7, 8, 

 and 9). 



The larva is cylindrical, rap- 

 idly tapering toward the front 

 and truncate behind. It is 

 white and has a dark, some- 

 what Y-shaped area at the head. 

 The segments are indistinct, 

 but the trachea and spiracles 

 are easily visible. Its length 

 is 7. 3 mm. ; thickness, 1. 35 mm. 

 The pupa is plump, smooth, 

 and shining. It is light reddish- 

 brown, with the spiracles and 

 posterior margin darker red- 

 dish, becoming darker on an- 

 terior five segments and espe- 

 cially on anterior three. The 

 first segment is very dark; 

 the second and third are somewhat lighter; the fourth and fifth are 

 much lighter, and the sixth to last segments about a uniform tint. 

 Length 4. 1 mm. , width 1.36 mm., diameter 1.4 mm. 



Leria latens Aldrich. 



Rep. Ind. Geol. Surv., xxi, 1896, 188 (Donnehue's, Shiloh, Porter, and Mayfield's 

 caves in Indiana) ; Cat. N. A. Dip. , 1905, 573. 



Very abundant; the most abundant species of Helomyzidae in the 

 cave. Found from the mouth to the mound, where it becomes scarce. 

 It is most abundant from "5" to " 17," and is common from the mouth 

 to "20." It has been rarely noted beyond the mound. During the 

 summer this species becomes extremely abundant near the mouth, so 



FIG. 8. Pupa of Oecothea fenestralis. 

 Ventral view. X 15. 



FIG. 9. Pupa of Oecothea fenestralis. 



Side view. X 15. 



