| abstract | The present paper reports 3 new species of Laelaps collected off Mus pahari Thomas, from Guizhou Province, China. All the type specimens are deposited in the Department of Parasitology, Guiyang Medical College.
Laelaps paucisetosa, sp. nov.
Female (figs. 1-3) Idiosoma small, 469µ in length and 362µ in width. Scutum averaging 443×340µ, with 35 pairs of setae, D7 and I1-3 absent; setae on the center of plate smaller than the peripheral ones, especially S6-8 and D8, S8 about 1/5 length of M11, S6 only 1/3 of S5. Sternal plate twice as long as broad, with an echelon on posterior margin. Genitoventral plate flask-like, widest at the level of Vl2, its posterior margin round, the distance between Vl1 somewhat longer than that between Vl4. Ad rather heavier than PA. Peritreme extending to behind coxae I. Pilus dentilis narrower at base, with terminal portion bended.
Male (figs. 4-6) Body oval, 428µ in length. Scutum 418×275µ, with 35 pairs of setae. Holoventral plate bearing 10(1/2) setal pairs. Digitus fixus slender, its tip beyond the midpoint of the spermatodactyl.
Holotype (♀), allotype (♂) and paratypes (38♀♀, 1♂, 5 protonymphs) were collected off Mus pahari Thomas and Apodemus chevrieri Milne-Edwards, from Xingyi, Duyun and other Counties, in June and Oct. 1977 and Feb. 1979.
Diagnosis of the new species: Idiosoma is small and highly sclerotized. Scutum bears 35 pairs of setae, D7 and I absent, D8 and S6-8 obviously small, Ad heavier than Pa. Sternal plate of female is broad, with an echelon. Digitus fixus of male is long and its length exceeds half the length of spermatodactyl. By these characteristics, the new species may easily be differentiated from all the known species of Laelaps.
Laelaps guizhouensis, sp. nov.
Female (figs. 9-11) Idiosoma 605µ in length, 405µ in width. Dorsal plate 575×377µ with 39 setal pairs, M11 twice the length of S8. Sternal plate 112µ long (in middle) and 175µ in maximum width; anterior margin of the plate flat, bearing a pair of tubercles anterio-laterally to St1; posterior margin of the plate concave, with an echelon. Genito-ventral plate 242µ long, 162µ in maximum width, the distance between Vl1 merely half of that between Vl4. Anal plate triangular, 98×93µ, PA twice the length of Ad. Peritreme extending to the anterior portion of coxa II. CoxaeI, II, III bearing one spur each. Pilus dentilis straight and long, with terminal end bent and inflated.
Holotype (♀) and paratypes (108♀♀) were collected off Mus pahari Thomas, in June and Oct. 1977 and Feb. 1979, from Ceheng and other Counties, Guizhou Province.
The present species closely resembles Laelaps nuttalli Hirst, 1915, except that it bears an echelon on the posterior margin and a pair of protuberances on the anterior margin of the sternal plate, which are lacking in L. nuttalli; the distance between Vl4 is two times the distance between Vl1 in the new species, and in L. nuttalli the distances between Vl4 and between Vl1 are subequal; the peritreme of the new species ends at the middle of coxa II, while that of L. nuttalli reaches forward to the hind portion of coxa I.
Laelaps xingyiensis, sp. nov.
Female (figs. 12-16) Idiosoma large, 801µ in length. Scutum 747×553µ in average, bearing 39 setal pairs, M11 twice the length of S8, S8 only half of S7. Sternalplate 154µ long (in middle), 236µ wide (widest point), anterior margin convex, and posterior margin concave, with echelon. Genitoventral plate 296µ in length, 204µ in width, the distance between Vl1 shorter than that between Vl4. Anal plate triangular, 45×27µ, anterior margin slightly convex medially. Peritreme extending to the middle of coxa I. Coxae I, II, III each bearing one spur, and tarsi II, III each with two spurs. Pilus dentilis spatulate in shape.
Holotype (♀) and paratypes (11♀♀) were collected off Mus pahari Thomas, in June and Oct. 1977 and Feb. 1979, from Xingyi County, Guizhou Province.
The new species closely resembles Laelaps jettmari Vitzthum, 1930, but the distance between Vl4 obviously exceeds that between Vl1. The distance between Vl1 is larger in L. jettmari. The peritreme of the new species extends t the middle of coxa I, it is longer than that of L. jettmari. Besides, the pilus dentilis of the tw species are quite different in shape. |