LICE OF POULTRY. THE BEDBUG 



83 



broad; each segment marked laterally by long tongue-shaped spots. 

 The general color is yellowish. The female is 3 to 3.5 mm. in length, a 

 size exceptional in this genus (Fig. 49). 

 About as common as the preceding species. 



3. Lipeurus caponis (L. variabilis). — In all members of this genus the 

 body is elongated and narrow. Head longer than broad and roimded in 

 front. Abdomen long and slender with black margins. Color yellowish 

 white. Female about 2 mm. in length (Fig. 50). 



By its long and slender appearance this species can easily be dis- 

 tinguished from others infesting the chicken. It is not very common. 



4. Lipeurus heterographus. — Head more narrow in front and body 

 much stouter than in preceding species. Abdomen elongated oval^in 



Fig. 49.— Gonio- 

 cotes abdominalis 

 (after Osborn, from 

 Denny, Bui. No. 5, 

 Bureau of Entomol- 

 ogy, V. S. Dept. of 

 Agr.). 



■ Fig. 50. — Lipeu- 

 rus variabilis (after 

 Osborn, from 

 Denny, Bui. No. 5, 

 Bureau of Entomol- 

 ogy, U. S. Dept. of 

 Agr.). 



Fig. 51. — Menopon 

 pallidum (after Os- 

 born, from Denny, 

 Bui. No. 5, Bureau 

 of Entomology, U. 

 S. Dept. of Agr.). 



outline with median spots on each ring. General color pale yellow. 

 Female 2 mm. in length. 



This species has not been often observed in this country. It is said 

 to also occur upon certain, species of pheasants. 



Of the Liotheidae chickens are hosts to two species, Menopum trig- 

 onocephalum and M. biseriatum. 



5. Menopum trigonocephalum {M. pallidum; Menopon pallidum). — 

 Head somewhat triangular, rounded in front and at the temples. Abdo- 

 men of female elongated oval in outline, in male longer and narrower. 

 Legs stout and hairy. Color light yellow. Female about 1.5 mm. in 

 length (Fig. 51). 



This is the most prevalent of all of the hen lice. It is an active runner 

 and passes readily to other species of birds. 



6. Menopum biseriatum {Menopon biseriatum). — Head somewhat 

 crescent-shaped. Legs stout. Abdomen elongate. Has the same gen- 



