170 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



Abdomen of male: the characters are shown in the figures. The 

 basal tergite is very small and has short, erect bristles at the corners. 

 The second, third, and fourth tergites have a veiy few short setae on 

 the surface in the middle; otherwise, the surfaces of these tergites are 

 bare, as are those of the fifth and sixth. Ventrally, the second sternite 

 has rather numerous short setae on its surface; the third has a verj'^ 

 few setae on its surface, a little in front of the marginal series, but 

 rather more setae at the sides; the surface of the fourth is bare except 

 for a submarginal scries (some of which, especially the outer ones, are 

 very long) across the middle part; the stout blackish teeth on the middle 

 of its hind margin are about 26, in two rather irregular series, with a 

 single long one at either extremity. The claspers are not very darkly 

 pigmented except at the apex; lying nearly parallel, but tapering and 

 curving a little upward and inward at the apex. 



MEXICO: Gulf of California, Angel de la Guardia Island, 20. 

 iii. 1937, 6 d", 4?, and Patos Island, 26. iii. 1937, 2 d', 5 ? (/. Garth 

 coll.). The collecting-stations are, respectively, nos. 707-1937 and 727- 

 1937. Host-bat, in both cases, Pizonyx vivesi Menegaux. One of the 

 female parasites from Angel de la Guardia Island carries a partly 

 extruded larva. 



TYPES (cf, ?) and paratj^pes in the collections of the Allan Han- 

 cock Foundation, The University of Southern California; other para- 

 types in the British Museum (Natural History). 



The specific name is a transliteration of the genitive of the generic 

 name of the host-bat. The genus Pizonyx is characterized by the com- 

 pression of its long claws, from which character the generic name was 

 apparently taken. 



Plate 16 



LEGENDS OF FIGURES 



Fig. 1. Basilia pizonychus, new species, 9 , dorsal view ; on left, the 

 left thoracic ctenidium and base of middle leg, more highly 

 magnified. 



Fig. 2. Basilia pizonychus, $, ventral view of thorax and abdomen. 



Fig. 3. Basilia pizonychus: left, 9, ventral view of abdomen; 



right, $ , dorsal view of abdomen. 



