Head deeply emarginate laterally; abdomen stout 



(on Apodiformes) Tvoahiloeoetes Paine and Mann, 1913 



Head not constricted on the lateral margins; 

 body more or less slender (on Passeriformes , 

 occasionally on hummingbirds) Ricinus DeGeer , 1778 



RICINUS 



Ricinus DeGeer, 1778. Mem. Hist. Ins., 7: 69. 



Type species: Ricinus fringillae DeGeer, 1778. 

 (By subsequent designation by Neumann, 1906, Bull. Soc. Zool. Fr . , 

 20: 56). 

 Nirmus Herman, 1804. Mem. Apterolog: 12 (nn for Ricinus DeGeer, 1778). 

 Physostomum Nitzsch, 1818. Germar's Mag. Ent . , 3: 302. 

 Type species: Ricinus nitidissimwn Nitzsch, 1818. 

 (A synonym of Ricinus fringillae DeGeer, 1778). 



Large species 2.5 to 5 millimeters in length, body elongate. Head 

 broadly conical, straight or slightly concave on lateral margins, without 

 ocular emarginations , forehead broad and usually truncate or flatly con- 

 vex in front. Temporal regions angulate. Underside of forehead with 

 2 small motile muscular lobes projecting caudad slightly beyond lateral 

 margins. Palpi prominent; antennae always concealed and very short. 

 Thorax longer than head, meso- and metathorax completely fused, 

 posterior width of metathorax equal to anterior width of 1st abdominal 

 segment. Legs robust with little coloration and few hairs. First 

 tarsal segment with a small double lobe, 2nd rather short. Abdomen 

 elongate-elliptical, 9th segment broad and rounded. General coloration 

 pale brown to yellowish with lateral "bands" on abdomen. 



Ricinus angulatus (Kellogg, 1896) 



Physostomum angulation Kellogg, 1896. Proc. Calif. Acad. Sci., 6: 



515, pi. 70, fig. 5. 

 Type host: Tyrannus tyrannus (Linnaeus) — Eastern Kingbird. 



Kellogg described this species from 2 females taken in Lawrence, 

 Kansas. Carriker (1957) selected the lectotype and states that the 

 material from the other hosts will prove to be different. 



The species is distinguished by the greatly produced occipital 

 angles extending nearly to the middle of the prothorax. 



Ricinus arcuatus (Kellogg and Mann, 1912a) 



Physostomum fasciatus arcuatus Kellogg and Mann, 1912a. Ent. News, 



23: 65. 

 Type host: Tyrannus vooiferans Swainson — Cassin's Kingbird. 



This species is recognized by 2 setae directly anterior to the eye, 

 the posterior angles of the head with 2 setae and the sides of the 

 prothorax with 3 long setae. 



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