20 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I28 



vex between PL and PLL-i and then becoming sinuate, but posterior 

 portion subparallel. Posterior margin definitely squarish. With two 

 kinds of punctae, the larger pits somewhat smaller than the setal bases 

 and scattered over the caudal three-fourths of scutum ; the micro- 

 punctae uniformly scattered. AL setae relatively thin, extending to 

 about level of SB. PL setae similar in structure but slightly longer; 

 extending to level of first usurped setae. With a distinct ridge ante- 

 rior to sensillary bases, which are midway between levels of ALs and 

 PLs. (Sensillae absent or distorted in specimens extant.) PPL-i 

 median, in vertical line with SB and near imaginary midline of scutum. 

 PPL-2 almost in line with PPL-i. Both pairs of usurped setae resem- 

 bling PLs. PPlV-i is 49 ( ±4) ; PPlV-2, 43 ( ± 5) ; PPP-i, 65 ( ± 5) ; 



STANDARD MEASUREMENTS IN MICRONS 



jj^j^j ^ ^0,oo^a,^r!:Q,Q Coxa II SD ASB Tarsus III 



Pa^at ^s'7v'^ ^^ ^^ ^^ ^° '°^ ^^ ^^ ^° ^^ 66/49=1.35 0.53 3-3 68/52=1.27 



p**«^", 47 70 45 20 114 38 27 32 30 1.36 0.52 3.5 1.3a 



Kange + or— 3 4 4 3 g 2 3 3 3 0.08 0.07 0.4 0.08 



PPP-2, 12 (±2). Body setae: Dorsal setae similar to ALs; about 

 28 (24 to 32) in number (excluding usurped setae), usually arranged 

 4.4.8.6, the rest irregular. With about 46 to 60 ventral setae, of which 

 about 15 to 20 are postanals. True ventrals thin, about 19 microns in 

 length, with fine pinnae. Legs: Coxae i-setose. Coxa III length to 

 breadth, 54:47 microns (ratio =1.15). Sternal setae arranged 2-2. 

 Sensory setae as G. exilis, new species. 



Type material.— Uolotype (No. B-i 77 19-5) and three paratypes 

 ex the ground squirrel, Menetes herdmorei Blyth, 1849, Thailand, 

 Nan, Pang Nam Un, January 21, 1953 (H. G. Deignan, ornithologist, 

 U. S. National Museum, and Robert E. Elbel, U. S. Special Technical 

 and Economic Mission to Thailand). Holotype (U.S.N.M. No. 2159) 

 deposited in collections of U. S. National ^luseum. Paratypes in 

 collections of senior author and Colonial Office Medical Research 

 Unit at Kuala Lumpur. 



Comment.— The species is named for Robert E. Elbel of the U. S. 

 Special Technical and Economic Mission to Thailand, who, while 

 working with the Thai Ministry of Public Health Division of Com- 

 municable Diseases on the control of arthropod-born diseases of Thai- 

 land, also contributed much to our knowledge of potential vectors of 

 disease in that country. 



