8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I28 



as long as PLs. Posterolateral setae marginal, inserted at a level some- 

 what caudad to bases of sensillae ; similar to ALs in structure. The two 

 pair of scutal setae usurped ^ from dorsal rows are marginal in posi- 

 tion ; first usurped pair as far from PLs as latter is from ALs, and 

 resembling PLs but slightly shorter ; second false pair of scutal setae 

 near caudal margin of scutum, plumose, but only about 45 microns in 

 length. With a distinct ridge anterior to each sensillary base. Sensillae 

 ovate to subglobose; with distinct petiole; 31 (including petiole) x 17 

 microns. The mean distance in microns between the first (anterior- 

 most) pair of usurped setae (PPL-i) is y2 (PPW-i), with a range 

 of ±4. Mean distance between second pair of usurped setae (PPL-2) 

 is 47 {PPIV-2), ±5. Distance from first pair of usurped setae to 

 posterior margin of scutum is 6t, {PPP-i), ±3. Distance from 

 PPL-2 to posterior margin of scutum is 16 (PPP-2), ±2. Body 



STANDARD MEASUREMENTS IN MICRONS 

 ^ fe 05 t^ 



^ Q, to '^ 



Holotype, U.S.A.T.C.t 



No. 750-14 39 72 38 24 



Paratypes (28) : 



Mean 40 73 39 26 



Range + or — 3 3 3 4 



setae: Dorsal setae similar to scutal setae but shorter and somewhat 

 less bushy, the pinnae not apparent for proximal fourth to sixth; 

 about 32 in number excluding those captured by scutum; arranged 

 2.4(2). 6(2). 8.6.4.2 (the numbers in parentheses referring to the 

 usurped setae). With about 46 to 48 ventral setae, of which 22 are 

 postanals. True ventrals about 28 microns in length, thin, distinctly 

 branched, but pinnae narrow. Legs: Coxae with ventral and dorsal 

 margins distinctly punctate; legs punctate. Coxa III (fig. 9) in ratio 

 of 61 (length) to 43 microns, viz, 1.41 (at maximal points). All 

 coxae I -setose, the setae long, thinly branched; in coxa I the seta is 

 submedian ; in coxa II (fig. 10, showing method of measuring length) 

 ventromarginal ; in III dorsomarginal, near apex. Sternal setae con- 

 sisting of a pair of long (50 microns), thin setae inserted near mid- 

 line about level with base of coxa I ; a second pair of shorter bristles 

 (30 microns), each member inserted near base of coxa III. Sensory 



® The dorsal setae which arise directly from the dorsal plate by virtue of its 

 posterior prolongation are henceforth referred to as usurped setae. The Als and 

 PLs are therefore not usurped setae. 



^ Abbreviations accompanying specimen numbers throughout "Description of 

 Species": U.S.A.T.C. = United States of America Typhus Commission; 

 U.S.N.M. = U. S. National Museum; C.O.M.R.U. = Colonial Office Medical 

 Research Unit ; B = Traub accessions. 



