NO. 6 CHIGGER SUBGENUS GAHRLIEPIA — TRAUB AND MORROW 9 



setae as follows: Leg I with two genualae and a microgenuala, a 

 tibiala, a spur and an adjacent microtibiala ; a tarsal spur, a micro- 

 tarsala proximad of this, a subterminala, a parasubterminala, and a 

 pretarsala. Leg II with a genuala; a tibiala and a spur; tarsus with a 

 spur and microspur and a pretarsala. Leg III with only a genuala. 



Type material. — Holotype and 40 paratypes (U.S.A.T.C. No. 750), 

 ex Rattiis rattus sladeni (Anderson) (attached to penis and peri- 

 neum), North Burma, Shingbwiyang, March 7, 1945 (U. S. A. Typhus 

 Commission). Other paratypes as follows: 40 ex the scrotum of an- 

 other Rattus rattus sladeni (No. 751), ibid.; * 20 paratypes ex peri- 

 neum (No. 753), ibid. ; 12 (No. 756) ibid., but March 9 ; 40 ibid., but 

 ex perineum and hindquarters of Tupaia belangeri versurae Thomas 

 (No. 754), a tree shrew, March 8, 1945 ; 3, ibid., but ex Rattus fiil- 

 vescens fulvesccns (Gray), April 6. Holotype (U.S.N.M. No. 2154) 

 deposited in collections of U. S. National Museum. Paratypes de- 

 posited in collections of U. S. National Museum; British Museum; 

 Rocky Mountain Laboratory of the U. S. Public Health Service; 

 South Australia Museum; Colonial Office Medical Research Unit at 

 Kuala Lumpur; 406th Medical General Laboratory, U. S. Army, 

 Tokyo ; Army Medical Service Graduate School, Washington, D. C. ; 

 and those of E. W. Jameson, Jr., C. D. Radford, and the senior 

 author, as well as in various other collections. 



Comment. — Gahrliepia (G.) e.xilis, new species, is apparently par- 

 ticularly interesting for its seasonal and geographical distribution. 

 Although the India-Burma Field Party of the U. S. A. Typhus Com- 

 mission examined several thousand hosts from the Ledo, Assam area, 

 and Shingbwiyang and Myitkjana in North Burma, this species, un- 

 like many other chiggers, was collected only at Shingbwiyang. Ledo 

 and Myitkyina were typical examples of secondary forest or scrub ter- 

 rain, but Shingbwiyang was essentially all primary forest except where 

 military camps had been constructed in the past i to 2 years. Here, 

 moreover, G. exilis was exceptionally abundant in March (the height 

 of the dry season), relatively uncommon in April, rare during the 

 "little monsoon" rains in January and February, and apparently ab- 

 sent in June (the beginning of the rainy season) and in October (the 

 end of the monsoon season). No collections were made at Shingbwi- 

 yang in other months. G. exilis is, therefore, apparently a character- 

 istic inhabitant of primary forest during the dry season. It was col- 

 lected on 12 occasions — nine times from Rattus rattus sladeni, twice 



8 In these descriptions, ibid, refers to the data for the holotype and not to the 

 record immediately preceding. Only the differences in data between the particu- 

 lar paratype and holotype are cited. 



