210 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



Genus HAEMOGAMASUS Berlese 



Haemogamasus Berlese, Acari, Myriopoda et Scorpiones liucusque in Italia 

 reperta : Mesostigmata, fasc. 52, Nos. 2 and 10, 1889. — Ewing, Proc. Biol. 

 Soc. Washington, Vol. 38, p. 137, 1925 ; Proc. U. S. Nat. Mus., vol. 82, art. 80, 

 p. 2, 1933.— ViTzTHUM, Trenhia, vol. 8, p. 53, 1926; Zool. Jalirb. (Abt. Syst.), 

 vol. 60, pp. 393-405, 1931. (Genotype: Haemogamasus hirsutus Berlese, 

 1889.) 



Sternal shield with accessory setae ; legs without spurs ; male with- 

 out a separate anal shield ; ventral shield of nymph without accessory 

 setae. 



KEY TO FEMALES OF GENUS HAEMOGAMASUS ! 



1. All setae smooth ; chelae toothless 2 



With some barbed setae, chelae with teeth 3 



2. At least 2 pairs of accessory setae on anterior margin of sternal shield; 



anterior pair of sternal pores on level of anterior pair of usual sternal 



setae hirsutus Berlese (p. 210) 



No accessory setae on anterior margin of sternal shield ; anterior pair of 

 sternal pores distinctly posterior to anterior pair of usual sternal setae 



harperi, new species (p. 223) 



3. Movable chela with 1 tooth ; usual sternal setae no larger than accessory 



setae avisug'us Vitzthum (p. 222) 



Movable chela with 2 teeth ; usual sternal setae distinctly larger than 

 accessory setae 4 



4. No accessory setae on anterior fourth of sternal shield. 



mandschuricus Vitzhum (p. 218) 

 At least 1 pair of accessory setae on anterior margin of sternal shield 5 



5. All usual sternal setae barbed ; 2 pairs of accessory setae on anterior mar- 



gin of sternal shield liberiensis Hirst (p. 221) 



Only anterior pair of usual sternal setae barbed; 1 pair of accessory 

 setae on anterior margin of sternal shield alaskensis Ewing (p. 213) 



HAEMOGAMASUS HIRSUTUS Berlese 



Figure 42 

 Haemogamasus hirsutus Berlese, Acari, Myriopoda et Scorpiones hucusque in 

 Italia reperta : Mesostigmata, fasc. 52, No. 2, pp. 117-118, table 125, 1889.— 

 OuDEMANS, Arch. Naturg., vol. 79, Abt. A, Heft 8, pp. 138-146, figs. 82-97, 

 table 2 ; figs. 1-10, table 8 ; figs. 6-11, 1913.— Hirst, Journ. Zool. Res., vol. 1, 

 p. 59, 1916.— Ewing, Proc. Biol. Soc. Washington, vol. 38, p. 138, 1925.— 

 ViTZTHUM, Zool. Jahrb., vol. 60, p. 396, 1931. 



Female. — Dorsal shield decidedly pointed posteriorly in available 

 specimens. In addition to the two usual apical setae at least five 

 smaller setae on apical margin. Shield densely covered with setae, 

 which are 9/* to 15fi apart ; large and small setae interspersed on shield ; 

 smaller setae more numerous and about 45/x in length; larger setae 

 about 90/A in length ; all setae smooth. Shield surface granulated in 

 appearance but not sculptured. Setae of unprotected integument of 

 dorsal surface larger than those on shield, longest at posterior body 

 margin, all smooth. Lacinae of tritosternum faintly barbed. Pre- 

 sternal area sculptured but with only faint indications of spines. 



