298 U.S. NATIONAL MUSEUM BULLETDf 23 6 



4th segment with strong apical seta; external margin with 2 fine setae. 



Antenna (fig. 1176) with styliform, unsegmented exopodite, carry- 

 ing 4 setae. Allobasis with single seta opposite insertion of exopodite. 

 Endopodite with total of 7 appendages. 



Oral appendages identical with those of Orthopsyllus linearis and not 

 described in detail here. Maxillule and maxilla, which have the same 

 number of setae as in that species, are figured here (figs. Il7c,d). On 

 the maxilla there are only 3 endites and an additional seta. 



Leg 3 was damaged during dissection with the result that I cannot 

 describe its structure. 



Leg 1 (fig. 117e) almost as in previous species, but 1st endopodal 

 segment slightly shorter, no internal seta. 3rd exopodal segment 

 with 4 appendages. 1 of setae of endopodite and 3 of setae on exop- 

 odite are provided with terminal brush. The particulars of legs 2 and 

 4 appear from figures 117 J, g and from the setal formula: 



endopodite exopodite 



leg 1 0.020 0.0.121 



leg 2 0.120 0.0.013 



leg 4 0.120 0.0.013 



Leg 5 (fig. 117A) with well-dereloped exopodite, separate from 

 baso-endopodite. Exopodite more or less triangular, as long as 

 greatest diameter, with total of 6 appendages, 2 of which are small. 

 Baso-endopodite as long as exopodite, with 2 apical and 3 internal 

 setae. 



Color horny yellowish, probably considerably faded in alcohol. 

 Chitinized area on cephalo thorax greenish, probably representing 

 eye. 



Adult male (loc. 592), total length 0.66 mm.; greatest diameter 

 0.15 mm.; length of longest furcal seta 0.14 mm. 



General shape of body as in 0. dubius, with same cylindrical appear- 

 ance; various somites stand out even more clearly by stronger chcular 

 constrictions (fig. 121a). Head and 1st thoracic somite fused; ce- 

 phalic somite as long as combined lengths of thoracic somites 2 to 4, 

 laterally only moderately produced. Back sinuous; rostrum exactly 

 as in female, notably shorter and with broader base than in 0. dubius, 

 slightly downwardly curved, apex more rounded (fig. 115c). Somites 

 of body of nearly same length, anal somite excluded. Epimeral plates 

 of thoracic somites 2 to 4 moderately produced, rounded. All somites, 

 as in female, bordered with scale-shaped teeth, smaller and more 

 numerous than in female, forming completely closed rows on abdomi- 

 nal somites. Armature of 6th legs (genital plates) and 2nd abdominal 

 somite distinctly visible in lateral aspect. Anal somite and furcal 

 rami as in female, but carina on rami less prominent and no big 

 caudal teeth, caudal border being provided with small teeth (fig. 115c?). 



