. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. ORDER HEMIPTERA. SUBORDER PARASITA. This group includes the suctorial lice, confined to mammals; they are strictly parasitic insects, being confined to their hosts constantly, and deriving all their nourishment from them. They are wingless, and the mouth parts consist of a tubular suctorial organ. This suborder contains but two families, the first of which, the Polycten Ida.', contains, so far as known, but two species, both of which are confined to bats, one in Jamaica and the other in China. These do not proper
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. ORDER HEMIPTERA. SUBORDER PARASITA. This group includes the suctorial lice, confined to mammals; they are strictly parasitic insects, being confined to their hosts constantly, and deriving all their nourishment from them. They are wingless, and the mouth parts consist of a tubular suctorial organ. This suborder contains but two families, the first of which, the Polycten Ida.', contains, so far as known, but two species, both of which are confined to bats, one in Jamaica and the other in China. These do not properly fall within the province of this paper, and it will not be neces- sary to give them further consideration. FAMILY PEDICULID^—THE SUCTORIAL LICE. This family includes nearly all the species of the suborder and all that come within the limits of this paper. We need only add to the character above given the short rostrum without joint and the tarsi adapted to clasping and holding to hairs. The eggs, " nits," are attached to hairs by a glue- like substance, and the young lice when hatched re- semble the adults except in size. As the entire life of the parasite is passed upon the same animal or on another animal of the same kind, its range of habit is easily stated. But very few of the species are ever found upon any other species of animal than that which they normally infest, and if so always upon very nearly § related species. Whether this is due to differences in the thickness of the skin, of temperature, of the size of the hair to which they must adhere and to which their feet are adapted, or to some subtle dif- ference in the odor or taste peculiar to their partic- ular host which leads them to discard all others, we are unable to say. The mouth parts are necessarily capable of great pedTcuil7ves2!enHThow. extension in order to reach the blood of their hosts. '°s rostrmn and extensile Uhler says (Standard i^at. Hist., ii, p. 209): uj^'-'^'s^^-^'y^-^'^^seA. fle
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