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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    tially a row of less numerous, shorter bristles. Laterally there is a more or less regular row of about 8 bristles, and between this row and the apical row 3 or 4 more. Description ok Plate IV. Fig. 1. Fig. 2. Fig. 3. Fig. 4. Fig. 5. Clasping organs, male Head of female. Last tarsal joint of hind leg. Terminal abdominal segments, female Hind tibia. 10 T Tenth Tergite. 10 St Tenth Sternite. P Process. F Finger. M Manubrium. IX St Ninth Sternite. 8 T Eighth Tergite. 8 St Eighth Sternite. < 10 T Tenth Tergite. 10 St Tenth Sternite. Sp Spermatheca. CTENOPSYLLUS MUSCULI Duges. [Plate IV.] Head.—Thefrons is prominent anteriorly, giving the head somewhat the shape of a fez. There are 4 spines on the posterior border of the gena. The antennal groove reaches to the top of the head. The max- illary palpi are shorter than the labial palpi, which reach to about two- thirds of the fore coxa and are 5-jointed. Maxilla triangular. Eyes absent. At the most prominent part of the frons anteriorly there are two short thick spines, while below these, running along the anterior margin, there are 5 bristles. Above there is an oblique row of 4 bristles, with 1 more placed near the top of the antennal groove. Between this oblique row and lower bristles there are nu- merous fine hairs. On the occiput there is a subapical row of about 7 bristles on each side, while in front of this are 3 oblique rows of bristles, the first containing 3, the second 4, and the third 5. On the posterior margin of the antennal groove there are several small hairs. On the first joint of the antenna there are about 3 hairs, while on the second joint there are 4 or 5, the longest somewhat longer than the third joint. Thorax.—The pronotum has an anterior row of about 10 bristles, and a ctenidium of about 24 spines. The mesonotum contains about 4 rows of bristles, more or less regularly disposed, each row consist- ing of about 8 or 0 bristles. The metanotum has 2 rows of bristles, a posterior row of about 10 bristles, and an anterior of the same num- ber, while there are several smaller bristles in front of this. The mesothorax contains about 10 bristles. The episternum of the metathorax has 2 bristles, and on the sternum there is 1 large one.