Dec, 1919.] Parker: New Species of Sarcophaga. 265 



abdominal segments is penetrated by the entire length of the respira- 

 tory tubes of the parasite. The tubes are white, not heavily chiti- 

 nized, corresponding in color to the skin of the host; the spiracles 

 are dark brown. The heavily chitinized circle is not visible, evi- 

 dently being concealed beneath the skin of the host. The abdominal 

 segments of the lepidopterous larva occupied by the parasite are con- 

 siderably swollen, while those beyond the limits of the parasite are 

 merely empty skin, with but few of the gills remaining. A large 

 number of alcoholic specimens of Elophila larvae were examined and 

 dissected, but no trace of the larval parasite could be found. 



It is not as yet known how the eggs of the parasite are deposited, 

 nor, indeed, how those of Elophila, the host, are laid. 



EXPLANATION OF PLATE XXV. 



Fig. 1. Larval sheet of Elophila fulicalis. 



Fig. 2. Pupal case of Elophila fulicalis. 



Fig. 3. Ginglymyia acrirostris, puparium. 



Fig. 4. Elophila fulicalis, parasitized larva showing protruding respira- 

 tory tubes of dipterous parasite. 



Fig. 5. Spiracle of puparium of Ginglymyia acrirostris. 



Fig. 6. Elophila fulicalis, larva. 



ANOTHER NEW SPECIES OF SARCOPHAGA FROM 

 NIAGARA FALLS. 1 



By R. R. Parker, 



Bozeman, Mont. 



Sarcophaga yorkii new species. 



Holotype (male) : Collection of writer. 



Paratype (male) : Collection of writer. 



Male. — Arista short plumose on proximal half ; one or two bristles in 

 angle formed by side of vitta and the diverging lower end of each row of 

 frontal bristles: calypters whitish with tuft of dark hairs at the fold; leg vesti- 

 ture short; posterior face of posterior femur with lower row of .long bristles; 

 submesotibial bristle absent; anterior acrostichals absent; inner presuturals 



1 Contribution from the Department of Entomology of the Montana State 

 College, Bozeman, Montana. 



