1918.] ECONOMIC ZOOLOGY- — ENTOMOLOGY. 563 



Asphondylia websteri n. sp., E. P. Felt {Jour. Econ. Ent., 10 {1911), No. 6, 

 p. 562). — A cecidoniyiid which has been found to occur in an isolated area in 

 the vicinity of Teiupe, Ariz., and was previously reported to be the European 

 species .4. miki (E. S. R., 27, p. 161) is here described as new. 



Hypoderma lineata in Netherlands, F. Baudet {Tijdschr. Diergeneesk., JfS 

 {1916), No. 23, pp. 881-889, pis. 4). — A report of observations of this warble tty 

 in the Netherlands. 



The effect of certain chemicals upon oviposition in the house fly (Musca 

 domestica), S. E. Ceumb and S. C. Lton {Jour. Econ. Ent., 10 {1917), No. 6, pp. 

 4S2-436. fig. 1). — Experiments conducted by the authors during the summer of 

 1916 gave positive evidence that carbon dioxid was the oviposition stimulant, 

 while a limited series of experiments with ammonia gave negative results. 

 While the re.sults do not agree with those of Richardson (E. S. R., 37, p. 159), a 

 careful analysis of his experiments have led the authors to conclude that the 

 apparent discrepancy between his results and theirs is only in the conclusions 

 drawn. 



Studies in flies. — Classification of the genus Musca and description of the 

 Indian species, P. R. Awati {Indian Jour. Med. Research, 5 {1917), No. 1, pp. 

 160-191, pis. 10). — A continuation of the studies previously noted (E. S. R., 37, 

 p. 358). 



The carriage of cysts of Entamceba histolytica and other intestinal pro- 

 tozoa and eggs of parasitic worms by house flies, with some notes on the 

 resistance of cysts to disinfectants and other agents, C. M. Wenyon and 

 F. W. O'CoNNOB {Jour. Roy. Army Med. Corps, 28 {1917), No. 5, pp. 522-527).— 

 In feeding experiments with flies (Musca, Fannia, Calliphora, and Lucilia) the 

 authors have confirmed the results of Kuenan and Swellengrebel,' and show that 

 the cyst stage of E. histolytica, the species which causes amebic dysentery, may 

 be ingested when infected feces are fed upon. They have also demonstrated that 

 the larger cysts of the nonpathogenic human ameba E. coli and of the flagellate 

 Lamblia intestinalis are ingested in a similar manner. Cysts of all three species 

 were found in the intestine 24 hours after the last feeding on feces, but after 

 this time they had been discharged from the intestine. 



The passage of living and active Trichomonas through the flies' intestines was 

 observed. The un: Itered and living cysts commenced to be deposited in droplets 

 of liquid feces within 20 to 30 minutes after the fly has fed on infected feces. In 

 the droppings of 15 wild house flies captured at random were found not only 

 the cysts of E. histolytica, E. coli, and L. intestinalis, but also the oocyst of a 

 coccidium and the eggs of varlouo parasitic worms {Twnia saginata, Ankylostoma 

 duodenale, Trichocephalus trichiurus, Heterophyes heterophyes and the com- 

 paratively enormous lateral-spined egg of Bilharzia). 



Eosin tests of their viability show that while the cysts of E. histolytica do not 

 survive drying they are fairly resistant if kept moist. Cresoi 1 : 40 or 1 : 50 was 

 found to destroy them. 



On a new nematode, Aproctonema entomophagum n. g. and n. sp., which 

 parasitizes a dipterous larva, D. Ketlin {Compt. Rend. Acad. Sci. [Parts], 165 

 {1917), No. 12, pp. 599-401, fists. 6).— This new nematode is a parasite of the 

 larva of Sciara pullula. 



What determines the duration of life in Metazoa? J. Loeb and J. H. 

 NoBTHEOP {Proc. Nat. Acad. Sci., S {1917), No. 5, pp. S82-S86).— In the authors' 

 experiments with the pomace fly the ratio of the duration of the life of the 

 insect to the duration of the larval, pupal, and imago stages was found to 

 be approximately constant for all temperatures, and the same was true for the 

 ratio of the larval to the pupal stage. 



iCentbl. Bkt. Letc], 1. Abt, Orig., 71 (1913), No. 5-7, pp. 378-410, pis. 2, figs. 15. 



