ART. 30 NEW PARASITIC MITES EWIXG 5 



Remarks. — Described from a female specimen taken from type 

 host, a wood rat, collected at the type locality by J. S. Sanford, 

 March 21, 1929. This species is very distinctive in having a sternal 

 plate so reduced that it bears only two of the six sternal setae. 



EUHAEMOGAMASUS OREGONENSIS, new species 

 Plate 2, Figure 1 



Body almost twice as long as broad. The two chelae of each 

 chelicera of equal length; movable one curved and with two teetli, 

 both being on the outer margin; fixed chela almost straight, with 

 two teeth and an inflated seta near the tip. Epistome conspicuous, 

 with fringe of slender, pointed, and sometimes branched processes. 

 Sternal plate broader than long, both anterior and posterior margins 

 strongly concave and lateral angles produced into conspicuous proc- 

 esses. Genitoventral plate swollen and broadly rounded posteriorly, 

 bearing about 20 setae, the front marginal pair of which are much 

 larger than the others. Anal plate broadly rounded in front and 

 produced posteriorly into an angulate process; anus large, situated 

 centrally; anterior pair of anal setae situated opposite center of 

 anus. Second pair of legs slightly enlarged, third pair the longest 

 and slenderer than the others. Length of female, 0.98 mm ; width, 

 0.63 mm. 



Type host. — Phenaconiys alhipes. 



Type locality. — Netarts, Oreg. 



Type s7/f/e.— U.S.N.M. no. 1070. 



Remarks. — Described from two females taken from type host, a 

 forest tree mouse, collected at Netarts, Oreg., by Kosaline R. Walker, 

 December 6, 1930 (Bishopp no. 14989). This species is characterized 

 particularly by the produced lateral angles of the sternal plate. 



CYCLOLAELAPS, new genus 



Body almost circular and not thickly beset with setae; dorsal 

 plate not sculptured, or but slightly so. Chelicerae Avithout brush 

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

 of female broader than long, with two pairs of pores and three 

 pairs of stout setae; genitoventral plate never reaching anal plate, 

 provided with a single pair of setae; anal plate broad, rounded in 

 front, pointed behind, and bearing three setae; metapodal plates 

 very small, oval. Legs short, stout ; coxae II and III each provided 

 with a prominent spine or spur. 



Type species.— Cy do! aelaps circularise new species. 



Remarks.— T\ns genus is related to Heterolaelaps Hirst. It dif- 

 fers from Heterolaelaps in having but a single pair of setae on the 

 genitoventral plate instead of five pairs. The type species only is 

 included. 



