ART. 30 NEW PARASITIC MITES EWING 7 



MACROLAELAPS PERUVIANUS, new species 

 Plate 2, Figures 5, 6 



A large, robust species ; body sparsely clothed with short, spine- 

 like setae. Chelicerae large and powerful ; brush of setae near base 

 of movable chela present; fixed chela equal to movable one, curved, 

 with three teeth and a straight, noninflated seta; movable chela 

 strongly curved, with two teeth. Sternal plate about as broad as 

 long, anterior and lateral angles acuminate, posterior margin broadly 

 notched, pores conspicuous, sternal setae very long, curved, sub- 

 equal. Endopodal plates distinct, much longer than broad; endo- 

 podal setae equal and similar to sternal setae. Genitoventral plate 

 longer than broad, only slightly inflated posteriorly, setae on same 

 equal and similar to sternal setae. Anal plate small for the size 

 of the mite, broadly rounded in front; anal opening central, much 

 longer than broad; paired anal setae much smaller than the unpaired 

 one and situated on the level of the center of anal opening. Legs 

 stout; femur and patella of first pair each with a seta-bearing dorsal 

 protuberance; second pair of legs considerably stouter than the 

 others; all coxae spine-bearing. Length of female, 1.9 mm; width, 

 1.25 mm. 



Type host.—'' Wild rat." 



Type locality. — Lima, Peru. 



Type s7«VZ€S.— U.S.N.M. no. 1072. 



Remarhs. — Described from eight females taken as follows: Two 

 from type host at type locality, by Dr. C. R. Eskey (no. 22) ; three 

 by the same collector from " mice and rat ", Peru, 1931 ; three by same 

 collector from " wild rats ", Peru, 1930. A very distinctive species. 



HEMILAELAPS, new genus 



Body stout, but oval in shape, not subcircular, not thickly beset 

 with short setae, and not sculptured dorsally. Chelicerae without 

 brushes of setae, fixed arm without recurved, fanglike setae. Sternal 

 plate of female broad and with three pairs of setae; genitoventral 

 plate longer than broad, not reaching anal plate, anterior margin 

 indefinite, and bearing a single pair of setae; anal plate subtrian- 

 gular, about as broad as long, with two paired and one unpaired 

 setae. Legs stout ; none calcarate ; second and third coxae each with 

 a stout, short, curved, sausage-shaped spine. 



Type species. — Hemilaelaps americanus, new species. 



Remarks.— This genus is rather closely related to Neolaelaps Hirst, 

 from which it differs in having a normal instead of a greatly en- 

 larged peritreme, and in having only a single pair of setae on the 

 genitoventral plate instead of three pairs. 



