8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 82 



HEMILAELAPS AMERICANUS, new species 



Plate 3, Figure 1 



General appearance similar to that of a species of Liponyssus, 

 the dorsal plate not covering the body, \vhi(;h in turn is almost bare 

 of setae. Chelicerae of the type of the genus Laelaps; movable 

 chela slightly curved, with three teeth; fixed chela almost straight, 

 with two teeth. Sternal plate broader than long, anterior margin 

 indefinite, posterior margin outwardly rounded; sternal setae short, 

 curved, subequal, and arranged in two diverging lines. Endopodal 

 plates indefinite; endopodal setae similar to sternal setae. Genito- 

 ventral plate about twice as long as broad, broadly rounded behind. 

 Anal plate large, subtriangular. Legs stout; second pair not en- 

 larged ; femur I with spinelike setae above ; coxae I and II each with 

 a short, stout, sausage-shaped spine. Length of female, 0.64 mm; 

 width, 0.33 mm. 



Type host. — Drymarchon corals inelanums. 



Type locality. — Brownsville, Tex. 



Type {holotype) slide.— \J.S.'^.'M. no. 1073. 



Remarks. — Described from a female specimen taken from the type 

 host, a snake — the indigo racer — collected at the type locality by 

 Grace Wiley, April 12, 1930 (Bishopp no. 13900). This species, the 

 type of its genus, combines the characters of the genera Laelaps and 

 Liponyss-us. 



HEMILAELAPS DISTINCTUS. new species 



Plate 3, Figure 2 



Bod}^ stout; ventral plates poorly sclerotized, integument practi- 

 cally devoid of setae. Chelicerae moderate in size ; movable chela with 

 two teeth exclusive of terminal hook ; fixed chela almost straight, with 

 a single tooth and a small noninflated seta, ending in a clawlike hook. 

 Sternal plate about as broad as long, front margin strongly convex, 

 posterior margin concave, anterior angles acuminate; sternal setae 

 very small, arranged in two divergent rows. Genitoventral plate 

 about twice as long as broad, but slightly inflated posteriorly, with 

 two pairs of setae. Anal plate large, subtriangular, anus small, situ- 

 ated slightly in front of center; anal setae small, subequal. Legs 

 short; femora I and II each somewhat inflated and bearing above a 

 few spinelike setae ; all coxae large, those of first and second pairs of 

 legs each bearing a short stout spine. Length of female, 0.6 mm; 

 width, 0.31 mm. 



Type host. — Elaphe ohsoleta. 



Type locality. — Kentucky, 



Type slide.— U.^.'^.M. no. 1074. 



