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PROCEEDINGS OF THE NATIONAL MUSEUM 

 MEASUREMENTS OF TYPE OF EUREUM PACIFICUM 



Structure 



Body 



Ifrons 

 temples, 

 occiput- 

 Pro thorax 



Length 



3.40 



.71 



.533 

 .69 



Width 



1.06 

 1.47 



Structure 



Mesothorax 

 Metathorax 

 Abdomen -- 

 Basal plate. 

 Parameres-. 



Length 



.20 

 .41 

 1.73 

 .76 



Width 



1.30 

 1.67 

 1.78 

 .24 



Genus DENNYUS Neumann 



DENNYUS DISTINCTUS Ferris 



Figure 3, c, d 



Dennyus distindus Ferris, Can. Ent., vol. 48, p. 310, figs. 10a, 15, 1916. (Host: 



Collocalia sp.) 



A single male of what seems to be this rare species was taken on 

 Collocalia inexpectata bartschi, July 29, 1945, by Mr. Baker. 



The only discrepancy found in comparing the specimen with Ferris's 

 description was the length, which he gives as 1.9 mm. for the male, 

 while the Guam male is 2.19 mm., being equal to thelength of Ferris's 

 female. It is possible that a direct comparison with the type of 

 distinctus will show the present specimen to be subspecifically distinct, 

 but until that can be done it seems best to identify it merely as 

 Dennyus distinctus Ferris. 



As far as I am aware there is no published record of the taking of the 

 species since the description of the types. 



Genus ACTORNITHOPHILUS Ferris 



ACTOKNITHOPHILUS MILLERI (Kellogg and Kuwana) 



Figure 4, a, b 



Colpocephalum milleri Kellogg and Kuwana, Proc. Washington Acad. Sci., vol. 

 4, p. 483, pi. 30, fig. 6, 1902. (Host: Anous stolidus.) 



The Guam specimens agree exactly with the description and figure 

 by Kellogg and Kuwana of C. milleri. Seven males and 13 females 

 were taken from two individuals of Anous stolidus, shot on May 21 

 and July 21, 1945, by Mr. Baker. 



Kellogg and Kuwana give Sula leucogaster and Anous stolidus as 

 the hosts of this parasite, but this cannot be accepted as authentic, 

 knowing as we do the inaccuracy of so many of Kellogg's host records. 

 The taking of the species on Guam from only Anous stolidus seems to 

 prove conclusively that the true host of the species is that bird. 



The species is deeply and uniformly pigmented, with the abdomen 

 almost pointed in the female and to a less extent in the male. There 

 is an unusual and striking dimorphism in the shape of the preanten- 

 nary portion of the head. In the female the frons is but slightly 



