On some Mallophaga. 33 



In a series tlie liead and thoracic measurements seem fairly 

 constant for both sexes. The length of the male abdomen is slightly 

 variable as the flgures show, but where the abdomen is shorter, 

 füll development has probably not been attained though the genitalia 

 are formed. 



Gen. Wii'iHus Nitzsch (1818). 



^u'HiHS Jtiatieulae Benny (1842). 



N. hiaticulae Denny, Mouogr. Anopl. Brit. , p. 136, tab. 11, fig. 10 

 (1842). 



2 $$. '? Regenpfeifer" {Charadrius hiaticula). 

 Gjanoyri, Aug. 1912. K. Schreiber leg. 



N. hiaticulae D. is possibly a synonym of iV". hicuspis N. from 

 Charadrius duhius but the species of the section "bicuspidati" of 

 this genus require careful discrimination and at present it seems 

 safer to retain Denny's name. 



^ii'niiis ochroirygus Nitzsch (1818). 



N. oehropijgus NiTZSCH, in: Giebel, Ins, Epiz., p. 160, tab. 5, figs. 5 

 and 6 (1874). 



3 ^^, 2 $$. Haeniatopus ostralegus (3 expl.). 



Langesand, Gjanoyri, Strönmaes, 3., 13., 15./8. 1912. K.Schrei- 

 ber leg. 



Nirtnus phaeojyi Benny (1842). 



K phaeopi Denny, Monogr. Anopl. Brit., p. 144, tab. 10, figs. 6, 7 

 (1842). 



<^, 4 $$. Numenius phaeopus. 



Grönhölm b. Strömnses (Strömö), 12./8. 1912. Schreiber leg. 



On various waders e. g. Tringa spp. ; Strepsilas, Limosa ; Macheies 

 and Numenius as regulär hosts and occasionally on Totanus etc. 

 There oceurs a series of Nirmus of the general type holophaeus 

 Nitzsch (described from Machetes). These forms are extremely similar 

 in external facies. Bissection reveals minute diflferences in the male 

 genitalia while there is considerable Variation in size. The colour 

 also varies in intensity. 



A smaller, a medium, and a large size respectively may be 

 recognised in this series. 



Zool. Jahrb. XXXIX. Abt. f. Syst. 3 



