Vol. xxviiij ENTOMOLOGICAL XK\\ s. 343 



Sarcophaga haemorrhoidalis Larvae as Parasites of 

 the Human Intestine (Dipt.).* 



By L. HASEMAN, Columbia, Missouri. 



Dipterous larvae play a much more important role as para- 

 sites of man than is generally supposed. Numerous records 

 are available showing some of the most important types of 

 myiasis, but many cases are never brought to the attention of 

 the medical profession at all. Leuckart in his "Parasites of 

 Man" refers to cases of intestinal myiasis caused by the larvae 

 of Anthomyia and to the parasitic work of Musca vomitoria 

 and Sarcophaga carnaria in neglected wounds. Riley and 

 Johannsen in their "Medical Entomology" review briefly a 

 number of cases of myiasis in man. Intestinal myiasis seems 

 to be due in most cases to the so called rat-tailed maggots 

 (Eristalis), the larvae of Anthyomyiidae, Muscinae and Sar- 

 cophagidae. Myiasis of the urinary tract is apparently due in 

 most cases to larvae of Fannia. In recent years the writer's 

 attention has been called to three cases of intestinal myiasis 

 due to rat-tailed maggots, one due to the larvae of Sarcophaga 

 haemorrhoidalis, and one case of myiasis of the urinary tract 

 in which two Fannia larvae were passed by a small boy, one 

 of which pupated and later emerged as the adult. The case 

 of intestinal myiasis due to the larvae of Sarcophaga haemor- 

 rhoidalis has proven to be a most unusual one. 



In the summer of 1915. the writer received through Dr. 

 Jones, State Bacteriologist, a vial of preserved dipterous lar- 

 vae from Dr. A. L. Lewis, of Sumner, Missouri, who reported 

 that they had been passed by a patient. The writer asked Dr. 

 Lewis to send living material for breeding if he succeeded in 

 securing additional specimens and to make sure about the orig- 

 inal source of the larvae. This request was later complied 

 with, but the larvae were dead, having been sent in a stoppered 

 bottle. In July, 1916, Dr. Lewis secured another supply of the 

 larvae, which he kept in a breeding cage until they pupated 

 and later emerged as adult flies. These were received in July 



*Read at the New York meeting of the Entomological Society of 

 America, I >ec., iy.K>. 



