596 MEDICAL ENTOMOLOGY 



ones gradually shortening. Pre-genital plate wanting ; genito-anal plate 

 triangular ; anal and adanal plates sub-rectangular and twice as long as 

 broad. Hypostome short, bifid, with rudimentary teeth. Palps long and 

 conical, concave on the dorsum, the fourth segment perpendicular to 

 the third and inserted at or near its base. Tarsi tapering, provided 

 with two small contiguous and terminal spurs. Length 4 mm. ; width 

 2'5. mm. (Neumann) 



Female. Scutum longer than broad, sub-triangular, cervical grooves 

 convergent anteriorly ; lateral grooves absent; numerous fine punctations; 

 palps broad, hollowed out internally, third segment broad, the fourth 

 terminal. Hypostome long, not bifid, borders parallel, with -four rows of 

 sharp marginal teeth. Tarsi with dorsal protuberance. Length 4 to 

 10 mm. ; width 3 to 7 mm. (Neumann) 



This species is widely distributed, occurring in Alaska, Behring 

 Island, King Island, Tasmania, Cape Horn, Campbell Island. New 

 Zealand, Kerguelen Island, Indian Ocean, Falkland Island ; also in certain 

 parts of England, Scotland and Wales. It is a parasite of marine birds 

 and infests their breeding places. 



SUB-GENUS ESCHATOCEPHALUS, FRAUENFELD 



Palps Pyriform and thickened at the distal extremity in the males ; 

 valvular in the female. 



Eschatocephalus vespertiUonis, Koch, C. L. Male. (Plate LXXVI, fig. 

 5.) Anal groove with long parallel arms. Coxae without spurs. Legs 

 very long, tarsi long, attenuated. First segment of palp not prolonged. 

 Scutum not well defined and divided into three longitudinal zones with 

 coarse punctations. Ventral plates as follows ; pre-genital small ; genito- 

 anal short and broad ; anal plate ogival, twice as long as broad ; adanal 

 long and straight. Capitulum short ; hypostome lanceolate, sloping at the 

 distal extremity, membraneous ; teeth rudimentary. Length 4 mm. ; 

 width 2'7 mm. (Neumann) 



. Female- Scutum much longer than broad, oval ; cervical groove super- 

 ficial ; punctations fine. Porose areas large, sub-triangular and broader 

 than long. Palps long, and flat ; hypostome pointed and lanceolate with 

 six to eight rows of teeth. Length 4 to 8 mm. ; width 2 to 6 mm. 

 (Neumann) 



This tick has up to the present only been found on bats, in many parts 

 of the world. 



Ticks belonging to the genus Ixodes require three different animals 

 to feed on in their larval, nymphal and adult stages. Lounsbury has 



