216 ERNEST WARREN. 



capsule witli the greatest uneasiness. It was therefore re- 

 moved from the incubatoi^ and on the following day it 

 pupated. After twelve days the fly emerged, the pupa having 

 been ke]-»t on slightly damp mould at the ordinary tempera- 

 ture of the laboratory. 



The fly closely resembles the common flesh-fly of the genus 

 S a V c o ]:) h ag a . 



In February of the same year Dr. Watt sent to me in spirit 

 a similar grnb passed by a white male patient. 



A few months ago I forwarded the bred fly to Mr. Ernest 

 E. Austen, of the British Museum, and he has very kindly sent 

 to me a technical description of it, and also some interesting 

 observations on the parasitic habits of Sarcophaga. 



Unfortunately the specimen is a female, and it appears 

 that it is not possible to determine the species with any 

 certainty from a solitary specimen of the female of a Sar- 

 cophaga. 



The following is Mr. Austen's description of the specimen: 



"Sarcophaga sp., bred from larva from human intes- 

 tine. $. Length, about 12 mm. Grey, with dark markings. 

 Head: face and sides of anterior portion of front silvery; 

 frontal stripe deep black ; palpi black, with paler tips. 

 Thorax with three sharply-defined black longitudinal stripes, 

 of which the median one extends nearly to the posterior 

 margin of the scutelhim. Abdomen marked with shimmer- 

 ing patches, which appear lighter or darker according to the 

 direction from which the light falls on the insect, and 

 marked with a median black longitudinal stripe and a stripe 

 on each side of this midway between the median stripe and 

 the lateral margin ; the admedian stripes are interrupted on 

 the hind margins of the segments, and do not reach the tip 

 of the abdomen. Apical segment orange." 



Mr. Austen further writes that he has " two species of 

 Sarcophaga bred from larvse from a sore on a girl's foot 

 in British Guiana. In Russia an allied species frequently 

 infests the nasal sinuses of human beings and domestic 

 animals. There are cases on record in which larva) of species 



