NEW MALLOPHAGA. 167 



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 

 Fiilica atra, Gallinula c/iloropus, Crex porzana, Podiceps 

 auritus, Podiceps cristatus; Denny found his scopulacorne 

 on jRallus aqaaticns, 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 Me.nopon 

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

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

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

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

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

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

 ensis[= Menopon titan(1)~\ (after Grosse). Fig. 9, Labium of Nirmus sp. 

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

 titan] (after Grosse). Fig. 11, Antenna of 5 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., $ . Fig. 3, D. graviceps Kell., $ . Fig. 4, D. acutipectus Kell., $ . 

 Fig. 5, D . quadraticeps Kell., V- Fig. 6, D. montereyi Kell., S . Fig. 7, 

 D. occidenlalis Kell., $ . Fig. 8, D. kansensis Kell., ? . Fig. 9, D. alri- 

 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 prazstans Kell., $ . Fig. 2, N. prmstans 

 Kell., ventral aspect abdomen of 6 . Fig. 3, N. hebes Kell., $ . Fig. 4, N. 

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

 Kell., S . Fig. 7, N. bozphilus Kell., $ . 



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

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

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

 N. lineolatus N., $ . Fig. 8, N. lineolatus N., ventral aspect abdomen of 6 . 

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



