NEW MALLOPHAGA. 151 



female taken from Procellaria glacialis. His description 

 is excellent. The males differ from the females very 

 little, the recognizable character being the hairless con- 

 dition of the posterior border of the last abdominal seg- 

 ment. On each lateral margin of this segment there is a 

 small group of short uncolored hairs, rather thick at base. 

 I figure the male and an immature specimen. The im- 

 mature specimen is without markings, except for a black 

 fleck in the posterior angle of head, and a weak indica- 

 tion of the prothoracic lines. The head and thorax are 

 of pale brownish, the abdomen whitish tinged with buffy. 

 The measurements of the specimens figured are as fol- 

 lows: Male, body, length 5.5 mm., width 2.65 mm.; 

 head, length .7 mm., width 1.87 mm. Young, body, 

 length 2.6 mm., width 1.2 mm.; head, length .5 mm., 

 width 1. mm. 



Trinoton lituratum Nitzsch. (Plate xiii, fig. 3.) 



Gerruar's Mag. Entoniol., 1818, vol. iii, p. 300. 

 Trinotum lituratum Nitzseh, Burin eister, Handbuch d. Entoinologie, 



vol. ii, p. 441; Giebel, Insecta Epizoa, 1874, p. 260, pi. xviii, fig. 



10. 

 Trinoton squalidum Deiiuy, Monograph. Anoplur. Brit., 1842, p. 235, 



pi. xxii, fig. 3; Giebel, Insecta Epizoa, 1874, p. 259. 

 Trinoton lituratum Nitzsch, Piaget, Les Pediculines, 1880, p. 597, pi. 



xlix, fig. 7. 



A few specimens taken from the Pintail, Dajila acuta, 

 and the Buff -breasted Merganser, Jl/ergatiser serrator 

 (Lawrence, Kansas). Nitzsch's original specimen was 

 found on Mergus albellus, and Denny's specimens were 

 taken from Anas clyfeata. Piaget found the species on 

 Dendrocygna arborea and Anser albifrons (Zool. Garden 

 of Rotterdam). The species is easily recognized by its 

 short broad outline and its markings. The female figured 

 by me measured as follows : body, length 2.1 mm., width 

 .63 mm.; head, length .5 mm., width .63 mm. 



