582 PROCEEDINGS OF THE NATIONAL MUSEUM 



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Figures 27-33. — Neohaematopinus callosciuri, new species, A'', sciurinus, and N. semi- 

 fasciatus: 27, N. callosciuri, allotype ? ; 28, N. callosciuri, holotype cf ; 29, Abnormal 

 antenna, A^. sciurinus, 9 ; Florida from S. niger; 30, Antenna, A'', sciurinus, 9 , Texas from 

 S. niger; 31, Same, c?; 32, Antenna, N. semifascialus, cf, Alaska from T. hudsonicus; 33, 

 Same, 9 . 



I have also seen material of this species from Callosciurus notatus, 

 North Borneo: Mount Kinabalu, Tenompak, Jmie 18, 1951, collected 

 by Traub. 



Diagnosis: N. callosciuri is very similar to A^. sciuri Jancke and 

 N. sciurinus (Mjoberg), differing only in the shape of the basal 

 antennal segment and size of its posteroapical enlarged seta. It is 

 separable from sciurinus in that the enlarged seta on the first antennal 

 segment is not as large in callosciuri (compare figs. 41 and 42). iV. 

 callosciuri is distinct from sciuri in that the apical enlarged seta is 

 borne on a slight prolongation of the basal antennal segment, whereas 

 in sciuri the basal segment is not modified and the enlarged seta is 

 set back from the margin (compare figs. 40 and 42). N. callosciuri 

 differs from both sciuri and sciuririus in having a flattened, rather 

 indistinct (but always present) tubercle on the venter of the basal 

 antennal segment. 



Description: Male: Head broadly rounded anteriorly; postanten- 

 nal angles marked; posterior head margins only slightly convergent 

 posteriorly. Basal antennal segment produced posteroapically and 

 bearing a stout seta; ventrally basal segment with flattened tubercle; 

 third segment modified, bearing two short, stout setae apically. 

 Thorax broader than long, about as long as head; sternal plate with 



