. Entomology for medical officers. Insect pests; Insects as carriers of disease. 198 ENTOMOLOGY FOR MEDICAL OFFICERS H. pectinata, which occurs on mice and rats, there is only one abdominal comb, situated on the ist tergum. Family SarcOPSYLLID^. (Dermatophilidse). The following are the necessary genera :— 1. Hind coxa without a patch of spines on the inner side = Dermatophilus {Sarcopsylla). 2. Hind coxa with a patch of spines on the inner side = Echidnophaga. Genus Dermatophilus, Gudrin {^Sarcopsylla, Westwood). The two recognised species of this genus are known as jiggers. Fig. 83.—Pregnant
. Entomology for medical officers. Insect pests; Insects as carriers of disease. 198 ENTOMOLOGY FOR MEDICAL OFFICERS H. pectinata, which occurs on mice and rats, there is only one abdominal comb, situated on the ist tergum. Family SarcOPSYLLID^. (Dermatophilidse). The following are the necessary genera :— 1. Hind coxa without a patch of spines on the inner side = Dermatophilus {Sarcopsylla). 2. Hind coxa with a patch of spines on the inner side = Echidnophaga. Genus Dermatophilus, Gudrin {^Sarcopsylla, Westwood). The two recognised species of this genus are known as jiggers. Fig. 83.—Pregnant female of Dermatophilus penetrans, and both are indigenous to South America. The male is small, as is the female when not pregnant, and both sexes suck blood. But the female also attaches herself to her host, embedding herself in its skin in a sort of inflammatory pocket from which the tip of the abdomen protrudes for the extru- sion of the eggs. When in this condition (Fig. 83) the abdomen of the gravid female swells to the size of a pea and loses its indications of segmentation, but at the poles (when the animal is removed and examined with a lens) the minute head and thorax and the tip of the abdomen can, in the species that attacks man, though not in the species that occurs on rats, be seen projecting. The human jigger {Dermatophilus penetrans), though an. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Alcock, A. (Alfred), 1859-1933. London, Gurney & Jackson
Size: 1550px × 1612px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpubl, booksubjectinsectpests
