The rat and its relation to the public health / by various authors ; prepared by direction of the Surgeon-General ; Treasury Department, Public Health and Marine Hospital Service of the United States.

Date:
1910
Catalogue details

Licence: In copyright

Credit: The rat and its relation to the public health / by various authors ; prepared by direction of the Surgeon-General ; Treasury Department, Public Health and Marine Hospital Service of the United States. Source: Wellcome Collection.

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    of claw which is covered by the other process forming a flap, cpiite hairy on its upper margin. The ninth sternite is described very well by Rothschild (8) as “boomerang” shaped. The eighth tergite has a small manubrium. Description of Plate VI. Fig. 1. Clasping organs of male Fig. 2. Head of male. Fig. 3. Terminal abdominal segments, female Fig, 4. Hind coxa and femur, inner surface. F ... Finger. M .. .Manubrium. IX St.... Ninth Sternite. 8 T Eighth Tergite. 8 Si Eighth Sternite. CTENOCEPHALUS CANIS Curtis. [Plate VI.] Head.—Strongly and evenly rounded in both sexes. Eye large. Maxilla triangular. Maxillary palpi about as long as labial palpi. Labial palpi reach to two-thirds of anterior coxae, 4-jointed. Seven spines along the lower margin of the gena. The posterior angle of the gena ends in a small tooth. Occasionally this may be absent. Antennal groove in the female reaches to within one-third of the top of head and is prolonged upwards by a chitinous thickening and in the male reaches almost to top of head. Two bristles on the gena, one placed well toward the anterior lower angle and the other in front of the eye. Usual number of bristles on posterior margin of the head, with 2 large ones back of the antennal groove. About 8 hairs on the second joint of the antenna nearly as long as the third joint. Thorax.—A row of about 10 bristles on the pronotum, with a ctenidium of about 14 to 16 spines. Two rows of bristles on the mesonotum, a posterior of about 12, another of more numerous smaller bristles placed well anteriorly. The metanotum contains a single row of about 10 or 12 bristles. The episternum of the meta- thorax has 3 or 4 stout bristles, while the epimerum contains an an- terior row of about 10 bristles and a posterior row of about 9. Abdomen.—The first abdominal tergite contains 2 rows of about 4 bristles each, while the other tergites to the seventh contain a single row of from 12 to 16 bristles. The stigmata are large. There is a single antipygidial bristle on each side. The sternites from third to seventh have a single row of 4 bristles each. Legs.—The hind coxa has on its inner side a patch of from 6 to 12 spines, while the hind femur has a row of 10 or 12 bristles on its inner surface. The spines on the posterior border of the hind tibia, with the exception of the apical, are in pairs, while in the apical group are about 3 stout bristles. The apical spine of the second joint of the hind leg reaches to nearly the middle of the fifth joint. On the fifth