NEW MALLOPHAGA. 539 



subtranslucent; metathorax also with distinct dark sub- 

 translucent lateral bands ; dorsal surface of abdomen 

 without short spiny hairs, and with a few longer weak 

 hairs arranged in complete transverse rows on segments 

 1-3, but decreasing in number on posterior segments : 

 last segment with posterior margin rounded about as in 

 male, but with fringe of closely set, short, weak, finely 

 pointed hairs; ventral surface of abdomen with the lateral 

 groups of short spiny hairs as in male. 



Menopon mesoleucum Nitzch. (Plate lxxiii, fig. 3.) 



Germar's Mag. Entomol., ISIS, vol. iii, p. 300. 

 Ricinus comicis De Geer, Mem. Ins., 1778, vol. vii, pi. 4, fig. 11. 

 Menopon mesoleucum N., Burmeister, Handb. f. Ent., 1835, vol. ii, p. 



439; Giebel, Zeitschr. f. ges. Naturwiss, 1866, vol. xxvii, p. 119; 



ibid, Iusecta Epizoa, 1874, p. 2S1, pi. xiv, figs. 11, 12; Piaget, 



Les Pediculiues, 1SS0, p. 426, pi. xxxiv, p. 7. 



A large variety of this species from the American 

 Crow, Corvus americanus (specimens from Lawrence, 

 Kansas, and Palo Alto, California). Nitzsch's type- 

 specimens were taken from Corvus comix and C. corone. 

 The American specimens are uniformly larger than the 

 type-form (length of mesoleucum, male 1.4 mm., female 

 1.8 mm.; length of var. americanum, male 1.7 mm., 

 female 2.12 mm.), and vary from the descriptions of 

 Giebel and Piaget in various particulars. 



Var. americanum Kellogg. Males, females and young 

 from the American Crow, Corvus americanus (Lawrence, 

 Kansas, and Palo Alto, California). Male. Body, length 

 1.7 mm., width .7 mm.; head, length .34 mm., width 

 .6 mm. Female. Body, length 2.12 mm., width .75 

 mm.; head, length .37 mm., width .69 mm. 



The species may be readily recognized by the marked 

 difference in the sexes, the female having the metathorax 

 produced backward and angulated on the abdomen 



