. Animal parasites and human disease. Insects as carriers of disease; Medical parasitology. .?)()6 OTHER liLOOD-SUCKING FLIES. posited, deep in the decaying material selected, in small batches of from two to half a dozen, until from 25 to 50 or more are laid; there are a number of such depositions made by a single fiy during her life. The eggs hatch in from two to five days, usually three, into whitish, almost transparent footless mag- gots (Fig. 242A) very similar to those of the housefly, but easily distinguishable by the position of the posterior stigmal plates (see Fig. 243). T
. Animal parasites and human disease. Insects as carriers of disease; Medical parasitology. .?)()6 OTHER liLOOD-SUCKING FLIES. posited, deep in the decaying material selected, in small batches of from two to half a dozen, until from 25 to 50 or more are laid; there are a number of such depositions made by a single fiy during her life. The eggs hatch in from two to five days, usually three, into whitish, almost transparent footless mag- gots (Fig. 242A) very similar to those of the housefly, but easily distinguishable by the position of the posterior stigmal plates (see Fig. 243). The larvae mature in a minimum of from 12 days to over two months, usually in about 15 to 20 days, and crawl into drier por- tions of the breeding material to Fig. 241. Egg3 of stable-flv, , rr-ii /-p,- oT->\ Stomoxys calcitraL X 20. Xo'to PUP^tC The pupSB (Fig. 2-42B) arC eggs natural size in upper corner, olive-shaped, chestuut-colored ol)- (After Ncwstead.) • , r aU r • i • jects, one-iourth of an inch m length. With favorable temperatures the adult ^y emerges in from six to ten days, but this period may be much prolonged by cold weather. The shortest time in which a stable-fly may develop from the time of egg-laying is about three weeks, antl this is extended under conditions which are not ideal. According to Herms' experiments, the average length of life of stable-flies is about 20 days. They sometimes live several months, however. There are several other genera and species of the family Muscidae which sometimes bite man, but none of them are habitual feeders on human blood, and the^^ are hardly worthy of special consideration. They all resemble Slomoxys in general appearance, though some, notably the common hornfly, Ilcrmatobia serrato (or Lypcrosia irritans), arc much smaller. Their life histories are in general like that of Stomoxys, though there is some variation as regards choice of breeding jilaces. Manure of various kinds is .selected by some species, as it
Size: 1592px × 1569px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectmedical, bookyear1918
