Vol. xxi] 



ENTOMOLOGICAL NEWS 



461 



Menopon pallidum Nitzsch. 

 Specimen from the domestic chicken (Canal Zone, Panama). 



Menopon incertum Kellogg. 



Specimen from a "fly catcher" (Canal Zone, Panama). 

 Kellogg has recorded the species from several passerine birds 

 from California and from twenty different bird species, mostly 

 passerine, from the Galapagos Islands. 



Menopon jenningsi n. sp. (Fig. I.) 



Specimens, male and females, from a guinea pig, Cavia 

 cobaya, (Canal Zone, Panama). This is the third Menopon 

 species to be recorded from a mammal. Menopon is a two- 

 clawed genus and ought to be found only on birds. As a 

 matter of fact all but three of its more than two hundred 

 species are limited to birds. The other two besides this pres- 

 ent new one recorded from mammals are Piaget's e.vtrancuin 



and longitarsus. Of these two the 

 first was described by its discover- 

 er from the guinea pig and the 

 second from Halmaturus gigau- 

 teus, a large kangaroo. Curiously 

 our new species, also from the 

 guinea pig, does not at all resemble 

 Piaget's extraneum from the same 

 host, which is indeed quite of 

 the usual bird-infesting Menopon 

 type. But our species does show 

 points of resemblance with the odd, 

 aberrant species longitarsus from 

 the kangaroo. Both longitarsus and 

 our species have a curious superfi- 



Fig. l. Menopon jenningsi n. sp. cial HkenCSS tO Species of the typi- 



cal guinea pig-infesting, one-clawed Mallophaga of the genus 

 G \ropus. There seems to be an actual modification of these 

 Menopon species of aberrant host habits toward the Gyro pus 

 species typical of the same hosts. Yet one of the mammal- 

 infesting Menopon species is not at all modified in this way. 

 Is its adoption of a mammal host a more recent matter, per- 

 haps? 



