NEW MALLOPHAGA. 533 



of body. Legs concolorous with thorax, with darker in- 

 distinct marginal and terminal margins. 



Abdomen short, broad, ovate, not turbinated; a single 

 very long hair and a spine in posterior angles of seg- 

 ments; broad, pale brown, transverse bands across all 

 segments but the last, these bands, however, hardly ap- 

 parent on the middle region of the body, but distinct 

 laterally, the lines of demarcation between pale and 

 darker parts of band rather sharply defined; last seg- 

 ment broad, flatly rounded, uncolored, with a fine fringe 

 of short, uncolored hairs. 



Menopon incertum n. sp. (Plate lxxiii,fig. 2.) 



Specimens from an American Gold Finch, Spiuus 

 tristis, and from a Russet-backed Thrush, Turd its ustu- 

 latus (Palo Alto, California) . This is one of these species 

 which might be referred almost indifferently to Menopon 

 or to Colpocephalum. Because Giebel has referred to a 

 somewhat similar form, thoracicum (Insecta Epizoa p. 

 287) from Turd us viscivorous, to Menopon, I assign this 

 species to the same genus. The new species differs from 

 thoracicum in the hairs of the prothorax, in the straight, 

 not angulated, posterior margin of the mesothorax, in 

 lacking a complete series of hairs along the posterior 

 margin of the metathorax, in the presence of the char- 

 acteristic spines of the posterior angles of the abdominal 

 segments, and in other particulars. The ocular emargi- 

 nations of the head are distinct, " fast colpocephalisch," 

 as Giebel says of thoracicum. 



Description of the male. Body, length 1.16 mm., 

 width .48 mm.; pale brown, with distinct, broad, dark 

 brown, transverse, abdominal bands, and blackish lateral 

 bands; head two-thirds as long as wide. 



Head, length .28 mm., width .44 mm. ; rather elongate 

 for Menopon, with distinct ocular emarginations; rounded 



