12 M. A. Carrikcr 



Head, length .58 mm., width .^ mm. 



This variety of fiiscus is recognized at a glance liy the absence 

 of clear pustules and fewer hairs on the transverse abdominal 

 bands, there bemg but four on each segment, while fitscus has 

 eight on segments one to five, and six on segments six and seven. 



With the exception of the smaller size, there are no other 

 appreciable differences. 



Six females collected on Accipitcr bicolor, at Juan Vinas, Costa 

 Rica, March, 1902. 



Nirmus curvilineatus Kell. and Kuw. 



Kellogg and Kuwana, Mallophaga from Birds of the 

 Galapagos .Islands. Proc. Wash. Acad, of Sci., 

 vol. IV, p. 470, pi. XXIX, fig. 4. 



This species, described from specimens collected on Nesopelia 

 galapagoensis and Oceanitcs gracilis in the Galapagos Islands, 

 was taken in large numbers from several individuals of Butea 

 borealis costaricensis, on the volcano Irazu, April, 1902, 



The taking of this species on a Buico complicates still more the 

 already confusing state of its distribution. It seems to me jthat 

 the present host is more typical of the three, and it leaves room 

 for the query as to whether Mr. Kellogg's specimens might not 

 have straggled from Butea galapagoensis. My specimens agree 

 perfectly with Mr. Kellogg's description and plate in every detail. 



Nirmcss atopus Kell. 



Kellogg, New .Mallophaga III, p. 18, pi. II, fig. 4. 



Numerous males and females collected on Piaya cayana mehleri^ 

 one male and female on Myiarchiis laxvrencci nigricapilliis, and 

 one male and female on Stelgidopteryx ruficollis tiropygialis, at 

 Juan Vinas, Costa Rica, March, 1902. I am inclined to think 

 that the specimens taken from the last two hosts were stragglers, 

 although there is no direct proof but, since it was described by 

 Mr. Kellogg from a Piaya and I took it in such large numbers on 

 a different variety of the same host species, it is probably confined 

 to the Cuculidae. 



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