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

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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$Length of joints of tarsi: Mid tarsi ($) 8 7 4\ 3 7 Hind tarsi 18 11 7 4 8 Mid tarsi (9) 8 7 5 3£ 7 Hind tarsi 21 13 8 5 8 Modified segments.— ( S ). The manubrium of the claspers is straight and narrow, while the process extends upward as a short, blunt cone, where at the tip there are several fine hairs. The lower margin is evenly and gently rounded. The finger is short, extending but a little above the process. It is concave on its anterior surface and convex on its posterior, and from the posterior margin there are 2 large and 2 small bristles alternating. Two long heavy bristles arise from the process below the insertion of the finger. The ninth ster- nite is broad, with a deep sinus in its posterior border. Its lateral surface contains numerous fine hairs, these hairs being somewhat larger just beneath the sinus. Along the dorsal border of the tenth sternite there are 3 heavy bristles in line. At the tip of the tenth tergite there is one heavy bristle. Besides these heavy bristles in this segment there are numerous fine hairs. (9 ) The eighth tergite contains just anterior to the sensory plate about 12 small hairs while just beneath the sensory plate there are 2 long bristles. Lower down there is a patch of about 6 bristles and on the apical margin 4 to 6. The stylet is short, cylindrical, slightly larger at the base than at the tip, where there is a long bristle. On the under surface arises a fine hair. Substylar flap (tenth sternite) has along its margin numerous hairs. Description of Plate III. Fig. 1. Clasping organs of male . Fig. 2. Head of female. Fig. 3. Terminal abdominal segments, female Fig. 4. Hind coxa inner surface. p Process. M .. .Manubrium. F .. .Finger. IX St.... Ninth Sternite. 8 T Eighth Tergite. 8 St Eighth Sternite 10 T ... .Tenth Tergite. 10 St Tenth Sternite. Sp ... Spermatheca. LCEMOPSYLLA CHEOPIS Rothschild. ' [Plate III.] Head.—Abruptly rounded. Flattened on top in <? . Eye present. No ctenidia on head. Antennal groove in the 9 reaches to within one-third of the top of the head. In & reaches to top of head. Gena obtusely pointed posteriorly. Maxilla triangular. Maxillary palpi are not as long as labial palpi. Labial palpi reach to apex of$