49§ CALIFORNIA ACADEMY OF SCIENCES. 



weak single hairs in posterior angles of segments and 

 naked dorsal surface: pale ground color, with narrow, 

 distinct, dark brown lateral bands and paler broad, rect- 

 angular transverse blotches, darker on posterior seg- 

 ments; a rather broad uncolored median longitudinal 

 line; segment i with transverse blotch entirely across 

 segment; segment 9 uncolored, * narrowly notched, and 

 with few long but weak hairs. 



Male. Body, length 1.47 mm., width .4 mm.; head, 

 length .33 mm., width .28 mm.; last abdominal segment 

 protruding, narrowly rounded, with a pair of hairs (one 

 longish, one short) on each side of the middle of the 

 posterior margin; genitalia composed of narrow bars, 

 and showing through in segments 8 and 9. 



Nirmus discocephalus Nitzsch. (Plate lxvii, fig. 6.) 



Germar'rf Mag. Eutomol., 1S18, vol. iii, p. 291. 

 Nirmus discocephalus Nitzsch, Burrneister, Handbnch d. Eut., 1835, 

 vol. ii, p. 430; Denny, Monograph. Auoplur. Brit., 1842, p. 113, 

 pi. ix, fig. 10; Giebel, Insecta Epizoa, 1874, p. 127, pi. vii, fig. 

 10; Piaget, Les Pediculine.s, 1880, p. 129, Supplement, 1885, 

 p. 18, pi. ii, fig. 7. 



My specimens, taken from a Bald Eagle, HaUxvetus leu- 

 cocephalus (Lawrence, Kansas), may be referred to this 

 characteristic Nirmus species of the eagles, found by 

 Nitzsch, Denny and Piaget on the European Gray Sea 

 Eagle, Halimetus albicilla; but the variations in number 

 of metathoracic hairs and in other particulars make it 

 desirable to distinguish the forms from the American 

 bird by a varietal name. The descriptions and figures of 

 Nitzsh, Denny and Piaget differ from one another with 

 regard to the shape of the head, number of metathoracic 

 hairs, etc., to a surprising degree, in view of the fact 

 that all the specimens examined were from the same bird 

 species. 



