NEW MALI.Ol'HAGA. 09 



Nirmus. 

 Nirmus fusco-marginatus Denny. (Plate V, fig. 0). 



Mouograph. Auoplur. Brit., 1S4'_', \>. l.'W, pi. x, tig. 1. 



N'trmun fusco-marijinatus D., Giebel, lusecta Epizoa, 1874, p. 178; 

 Piaget, Lea reJiculiues, 1880, p. 202, pi. xvi, tig. 6. 



Many specimens of a Nirmus which may be referred 

 to us a variety of this species of Denny, from an Amer- 

 ican Eared Grebe, Colyiabii>^ aujr'icull'is culifoni'icuH; also 

 two specimens (rather smaller) from two Pigeon Guil- 

 lemots, Cej)j>Jtii!< coluinba, and a single specimen from 

 the American Herring Gull, Luras argentatus smiUiiion- 

 ianas (all the birds from the Bav of Monterey, Cali- 

 fornia). Denny's types were taken from Pudiccps 

 aiLrltus (Ireland), and Piaget's specimens from Fodlcepn 

 crlsiatus. It seems to me that the Xirmus podicipis of 

 Denny (Monograph. Anoplur. Brit. p. 142, pi. x, fig. U) 

 and the Lipeurus runcinatus Nitzsch (Giebel, Insecta 

 Epizoa, p. 2oS) are both referable to fuscu-iiiar<jiiialaf<. 

 The antennal characters seem to be the same. As Pia- 

 get notes, the differing in the antennie of male and 

 female makes it ditficult to refer the species to Xii')/iuis. 

 It is a form showing a transition to LijteuriLS. Our 

 specimens are one-fourth hirger than the types of the 

 species and differ in some minor particulars. 



Var. americanus Kellogg ami Chapman. (Plate V, 

 fig. \)). l'\Miiale, body, length 2.02 mm., width .81 

 mm.; head, length .56 mm., width .44 mm. Dilfers 

 from the species type in having a spine in the posterior 

 angles of the prothorax, and a hair on each lateral half 

 of the posterior margin; the metathorax has six hairs 

 and a spine on each lateral half of the posterior mar- 

 gin. The species is easily recognizable by its long 

 slender body, short, narrow, pointed head, and the 

 black, lateral, triangular, abdominal blotclie.>^ with brown 

 inward-projecting processes. 



