The only constant morphological difference between this species and 

 the following is that C. colymbinus possesses at least 4 long setae on 

 abdominal sternites III-VII, while C. immer (see below) possesses 2 long 

 setae on abdominal sternites III-VII. 



Kellogg (1896) reported this species from California, and Thompson 

 (1940) reports examining this species from a Diver collected in North 

 American waters. 



Craspedonirmus immer Emerson, 1955a 



Craspedonirmus immer Emerson, 1955a. Ann. Mag. Nat. Hist., (12), 



8: 720. 



ti 



Type host: Gavia immer (Brunnich) — Common Loon. 



Peters (1936) reports this species from New Hampshire; Whitehead 

 (1954) from Quebec and Emerson (1955a) described this species from a holo- 

 type male and an allotype female collected at Boston, Massachusetts, 2 

 females from California, 1 male and 1 female from Washington, D. C. , 2 

 females and 1 male from Pennsylvania, all in the British Museum. He 

 also reports 23 females and 2 males from Isles of Shoals, New Hampshire, 

 in the USNM. 



Specimens Host Locality Date Collector 



3? (paratypes) Gavia immer Isles of Shoals, NH VI-1-1934 L.R.Nelson 



(MCZ) 



CRASPEDORRHYNCHUS 



Craspedorrhynchus Keler, 1938. Arb. Morph. Tax. Ent. Berlin-Dahlem, 5: 



239. 



Type species: Dooophorus platystomus Burmeister, 1838. 

 Falooeaus Clay and Meinertzhagen, 1938. Entomologist, 71: 275. 



Type species: Philopterus aquilinus (Denny, 1842). 



Head large with hyaline margin arising at the level of the clypeal 

 suture. Dorsal anterior plate large and distinct; clypeal suture pro- 

 longed inward on the dorsal surface of each side and passing down the 

 median line of the head as a narrow suture to the level of the antennal 

 fossae. Antennal bands of the head terminating in a point some distance 

 beyond the anterior margin of the dorsal anterior plate. Trabeculae 

 large. Antennae filiform and similar in the 2 sexes. Abdomen short and 

 rounded with tergal plates I-VII widely separated medially in both males 

 and females. Posterior margin of terminal abdominal segment rounded in 

 males, emarginate in females. 



Members of this genus are parasitic on birds of the order 

 Falconiformes excluding the family Falconidae. 



91 



