NO. 6 CHIGGER SUBGENUS GAHRLIEPIA — TRAUB AND MORROW 87 



evansi* (from Rattus in primary forest of North Burma) ; picta* 

 (from jungle-inhabiting Rattus in Malaya) ; tessellata* (from vari- 

 ous Rattus and from a ground squirrel and gymnuran in the primary 

 jungle in Malaya) ; tuberculata * (from several kinds of rats in vari- 

 ous ecological formations in Borneo) ; ampullata* (North Borneo) ; 

 granulata* (North Borneo rats in mountain forest). 



ACKNOWLEDGMENTS 



We are grateful to Dr. J. R. Audy, director of the Division of 

 Virus Diseases and Medical Zoology, Institute for Medical Research, 

 Kuala Lumpur, who was also director of the Colonial Office Medi- 

 cal Research Unit, for his great assistance in obtaining specimens 

 from Malaya and Borneo. Dr. Audy also kindly allowed us to use 

 his unpublished notes based upon a study of types in the British 

 Museum. Thanks are likewise due to those who served with the 

 senior author while with the United States of America Typhus Com- 

 mission in Assam and Burma and with the U. S. Army Medical Re- 

 search Units in Borneo and Malaya, particularly Dr. H. S. Fuller, 

 Dr. Kenneth Stager, D. D. Millspaugh, and Roy Melvin of the former 

 organization, and Capt. H. D. Newson, Capt. Bryce C. Walton, 

 Robert E. Elbel, and Dr. David H. Johnson of the latter. 



The North Borneo field projects were greatly facilitated by the 

 whole-hearted cooperation of the residents of the west coast (the 

 Honorable Mr. Sykes and the Honorable Mr. Combe), and that of 

 other North Borneo officials, such as Dr. William L. Neal, Director 

 of Medical Services, Dr. T. K. Abbott, Acting Director of Medical 

 Services, and T. White and J. P. Vyvyan, assistant district officers, 

 Ranau. The following members of the Colonial Office Medical Re- 

 search Unit greatly assisted in obtaining specimens in Borneo: 

 John L. Harrison, Ben Insoll, Phang Ang Wah, M. Nadchatram, 

 and Lim Boo-Liat. The Thai species were received through the 

 cooperation of Robert E. Elbel of the U. S. Special Technical and 

 Economic Mission to Thailand, and through the offices of the Thai 

 Division of Communicable Diseases, particularly Dr. Pramern Chan- 

 davimol, chief of the division, and Dr. Mali Thaineua, director of 

 the Banpong Plague Laboratory. We are indebted to Thomas Evans 

 of the Department of Entomology, Army Medical Service Graduate 

 School, Walter Reed Army Medical Center, Washington, D. C, for 

 having prepared the illustrations. H. Womersley of the South Aus- 

 tralia Museum kindly furnished us with study specimens of some of 

 the little-known Gahrliepia. Dr. H. S. Fuller, now with our depart- 



