MALLOPHAGA FROM BIRDS 473 



flatly convex, with one long hair and one short, and two prickles; 

 occipital margin nearly straight ; eyes prominent, flat, with one hair ; 

 antennce with segment 2 longest, segment 4 shortest, segments 4 and 5 

 are colored ; signature shield-shaped, distinct ; interrupted antenna- 

 bands dark brown, distinct ; temporal and occipital margins dark 

 brown. Prothorax subquadrangular, sides slightly converging in 

 front, with one short hair on the posterior angle ; well defined dark 

 brown marginal bands bent inward along posterior margin. Metal 

 thorax with diverging sides and very flatly rounding posterior angles ; 

 five long hairs in posterior angles and two short weak hairs along 

 posterior margin ; lateral borders dark brown ; a median long, spear- 

 head-shaped sternal blotch of light brown showing through. Legs 

 pale brown with dark brown margins. Abdomen elongate elliptical ; 

 posterior angles of segments except one with short hairs ; each of seg- 

 ments 2 to 7 with a marginal dark band, widest anteriorly and project- 

 ing inward along the anterior margins of segment ; all segments with 

 a broad golden brown transverse blotch covering all of the segment ; 

 segments 3 to 7 with a series of pustulated hairs on posterior margin ; 

 posterior margin of segment 9 rounded, with a few long hairs. 



Female. — Body, length 1.8 mm., width .38 mm.; head, length .48 

 mm., width .29 mm. ; slightly darker than male; last abdominal seg- 

 ment usually emarginated, with a few weak hairs. 



NIRMUS LEPIDUS sp. nov. 

 (PI. XXIX, fig. 7.) 



One male from Geospiza fuliginosa from Narboro ; one female 

 from Nesomimus carringtoni from Barrington and one male from 

 Sterna fuliginosa from Clipperton Island. A well-marked form, re- 

 sembling in general shape and head characters Docophorus insolitus 

 from Ptychoraitiphus alcuticus ' from Monterey Bay, California ; but 

 with Nirmoid, rather than Docophoroid, trabecular Both of these 

 forms are at the line between Docophorus and Ninnus and in their 

 combination of the characters of both genera make the generic dis- 

 tinction very uncertain. Among the Nirmi it resembles such forms 

 as N. opaczis^ from .^^gialites semipalmatus^ Monterey Bay, Cali- 

 fornia. 



Male. — Body, length 1.38 mm., width .41 mm. ; head and thorax 

 light brown with strong dark bands, abdomen smoky golden-brown, 

 with strong broad dark border; abdomen swelling in middle. Head, 



^Kellogg, New Mallophaga, i, p. 94, pi. iv, fig. 5, 1S96. 

 * Kellogg and Chapman, New Mallophaga, in, p. S3, pi. vi, fig. 6, 1S99. 

 Proc. Wash. Acad. Sci., Sept., 1902. 



