Sept., 1909.] EwiNG : New American Ortbatoidea. 133 



Family HOPLODERMILM-:. 

 Genu3 PHTHIRACARUS Perty. 



Unguis tridactyle : genital covers coalescing with anal covers. 



Phthiracarus fulvus, new species. (Plate VI, Fig. 34.) 



Light yellowish brown. Integument tliick and uneven. 



Cephalothorax three fifths as long as abdomen and about three fifths as high as 

 long. There are three pairs of prominent bristles situated on the dorsal surface of the 

 cephalothorax, which increase in length from the anterior pair backwards. These 

 bristles when examined under high power are seen to be slightly pectinate. Pseudo- 

 stigma five-lobed, with radiating furrows, situated about two fifths of the length of the 

 cephalothorax from the posterior margin of the same and about the diameter of the 

 organ itself from the ventral margin of the cephalothorax ; pseudostigmatic organ 

 moderately clavate, directed forwards and about as long as the femur of leg I. 



Abdomen pointed posteriorly, about three fifths as high as long. The dorsum 

 bears on each side three longitudinal rows of five stout, slightly curved bristles each 

 and three other similar bristles situated on the antero-ventral aspect. 



Anterior pair of legs slightly longer than the cephalothorax. Ungues stout, 

 about as long as the tarsi from which they extend. 



Length, 0.67 ram.; height, 0.32 mm. 



In moss. Collected by the writer at Mahomet, 111. One specimen. 



This species is near P. americana Ewing, but differs in the color 

 and texture of the integument : in the shape of the pseudostigmatic 

 organs which are more clavate, and in the size of the bristles of abdo- 

 men, etc. 



Genus HOPLODERMA Michael. 



Ungues monodactyle ; genital and anal covers separate. 



1. With a large hood or collar projecting from the anterior margin of abdomen. 



H. cuctiUatiitH sp. nov. 

 Without hood or collar 2. 



2. Hairs on abdomen spatulate //. /uimatuin s^. nov. 



Hairs on abdomen setiform H. illiiioisensis sp. nov. 



Hoploderma cucullatum, new species. (Plate VI, Fig. 35.) 



Body dark grayish green ; legs yellowish brown ; integument of abdomen pitted. 

 Cephalothorax with a median carina extending almost its entire length. Pseu- 

 dostigma not projecting, but low and circular, situated at the extreme posterior part 

 of cephalothorax. 



Abdomen with a large hood at the anterior end which overhangs the posterior 

 part of the cephalothorax ; posterior end of abdomen broadly rounded. The abdo- 

 men bears dorsally on each side near the median plane a longitudinal row of six 

 stout, short, spatulate bristles all inclined backwards. Genital covers longer than the 



