Dec - ! 9i9-] Lloyd: Gixglymyia acrirostris. 263 



Previous records. — From Taphozous perforatus Egypt. 



Material examined. — From Taphozous cavaticus, Tarussan Bay, 

 Sumatra, one adult female. 



Notes. — My specimen agrees entirely with the figure given by 

 Speiser. As far as I can see this species is strictly congeneric with 

 the preceding. 



EXPLANATION OF PLATE XXIV. 



Hesperostenes longiceps (Waterhouse) ? ; A, female, left half dorsal, right 

 half ventral; B. posterior tarsus: C, anterior tarsus; D, dorsal aspect of sec- 

 ond antennal segment, distal end upward. 



AN AQUATIC DIPTEROUS PARASITE, GINGLYMYIA 



ACRIROSTRIS TOWNS., AND ADDITIONAL NOTES 



ON ITS LEPIDOPTEROUS HOST, ELOPHILA 



FULICALIS. 1 



By J. T. Lloyd, 

 Ithaca, X. Y. 



Descriptions of the remarkable aquatic immature stages of Elo- 

 phila fulicalis were published in the Journal of the New York Ento- 

 mological Society in June, 19 14, but at that time no mention was made 

 of its Dipterous parasite, Ginglymyia acrirostris, and no attempt was 

 made to account for the manner of respiration of the gilless lepidop- 

 terous pupa, deeply submerged in the swift waters of Fall Creek. 



Elophila fulicalis. 



The larva, fig. 6, as stated in the previous article, lives under a 

 thin, irregular web of silk, fig. 1, on stones in the swiftest part of 

 the creek. It is abundantly supplied with gills and its respiration is 

 strictly aquatic. 



At the time for pupation the thin, irregular web of the larva is 

 cut away, and is replaced by an impenetrable, oval-shaped, roof-like 

 silk covering, fig. 2, which has a number of semi-circular openings 



1 Contribution from the Limnological Laboratory of the Department of 

 Entomology in Cornell University. 



