NEW MALLOPHAGA. 1 67 



ference in size amounting to but one-tenth of a millimeter 

 in total length in the female and half that in the male, 

 was taken on Fulica atra. Nitzsch found the species on 

 Fulica atra, Gallinula chloropus, Crex porzana, Podiceps 

 auritus, Podiceps cristatus; Denny found his scopulacorne 

 on Raltns aquatic/is, Podiceps minor and Gallinula chlo- 

 ropus. The species is easily recognized by the peculiar 

 trilobed process, function unknown, on the under side 

 of the hind-head (see fig. 4, pi. xv). 



EXPLANATION OF PLATES. 



PLATE II. — Fig. 1, Alimentary canal and salivary glands of Menopon 

 mesoleucum (after Nitzsch). Fig. 2, Alimentary canal of Docophorus fusi- 

 collis (after Nitzsch). Fig. 3, Nervous system of Lipeurus baculus{1) (after 

 Nitzsch). Fig. 4, Female genitalia of Menopon mesoleucum (after Nitzsch). 

 Fig. 5, Male genitalia of Menopon pallidum (after Nitzsch). Fig. 6, Respi- 

 ratory system of Menopon titan (original). Fig. 7, Head, under side, of 

 Lcemobothrium sp. (after Grosse). Fig. 8, Labium of Tetraopthalmus chil- 

 ensis^ Menopon litan( ?)] (after Grosse). Fig. 9, Labium of Nirmus sp. 

 (after Grosse). Fig. 10, Antenna of Tetraopthalmus chilensis [=Menopon 

 titan](aiter Grosse). Fig. 11, Antenna of ? Lipeurus. Fig. 12, Antenna 

 of 6 Lipeurus. Fig. 13, Leg of S Tetraopthalmus chilensis [== Menopon 

 titan]. 



PLATE III.— Fig. 1, Docophorus calvus Kell., ? . Fig. 2, D. fuliginosus 

 Kell., 3 . Fig. 3, D. graviceps Kell., S . Fig. 4, D. aculipectus Kell., $ . 

 Fig. 5, D. quadraticeps Kell., 9- Fig. 6, D. montereyi Kell., 8 . Fig. 7, 

 D. occidenlalis Kell., $ . Fig. 8, D. kansensis Kell., $ . Fig. 9, D. atri- 

 color Kell., $ . 



PLATE IV. — Fig. 1, Docophorus icterodes N.,?. Fig. 2, D. pertusus 

 N., $ Fig. 3, D. pertusus N., juv. Fig. 4, D. lari Denny, ? . Fig. 5, D. 

 insolitus Kell., ? . Fig. 6, D. melanocephalus Burm., 5 . 



PLATE V. — Fig. 1, Nirmus prcestans Kell., S . Fig. 2, N. prasstans 

 Kell., ventral aspect abdomen of S . Fig. 3, N. hebes Kell., $ . Fig. 4, N. 

 farallonii Kell., ?. Fig. 5, N. orarius Kell., $(?). Fig. 6, N. giganticola 

 Kell., $ . Fig. 7, N. bcephilus Kell., ? . 



PLATE VI.— Fig. 1, Nirmus punctatus N., ? . Fig. 2, N. punctatus N., 

 juv. Fig. 3, N. felix Giebel, $ . Fig. 4, N. felix Giebel, ventral aspect 

 abdomen of $ . Fig. 5, N. signatus P., 8 . Fig. 6, N. pileus N., ? . Fig. 7, 

 N. lineolatus N., $ . Fig. 8, N. lineolatus N., ventral aspect abdomen of $ . 

 Fig. 9, N. lineolatus N., juv. 



