Ewing — New North American Acarina. 55 
beak and possessing a long digit at its distal end on the inner dorsal 
aspect, from which springs a stout, pectinate bristle slightly longer than 
the digit itself; third segment short, as broad as long and with a promi- 
nate, stout, pectinate bristle on its outer margin, about twice as long as 
the segment itself; distal segment ending in a large, simple claw about 
twice as long as the segment itself, and with a single bristle on its inner 
margin; papilla small and bearing two slightly curved serrulae, the 
outer of which is slightly the longer, and two somewhat longer and more 
strongly curved, simple bristles. The outer serrula is about three- 
fourths as long as the claw of the distal segment. 
' Abdomen short; possessing four rows of scales similar to those of the 
cephalothorax; three scales in each of the two inner rows and four in 
each of the outer rows. 
The anterior pair of legs is very much elongated, being longer than 
' the body of the mite and about twice as long as the second pair. Tar- 
sus of leg I about two-thirds as long as the tibia, swollen distally and 
terminated by two long bristles both of which are longer than the seg- 
ment itself, the inner being slightly the longer. The tarsus of leg I 
bears no scales, all the other segments of leg I bear one or more large 
scales similar to those of the body. Tibia of leg I one and a half times 
as long as the genual. Claws of the last three pairs of legs moderate, 
situated on stout pedicels. 
Length, 0.32 mm.; breadth, 0.22 mm. 
Under a log. Collected by the writer at Urbana, III. 
RHYNCHOLOPHIDAE. 
Last segment of palpus transformed into a thumb, penultimate seg- 
ment ending in a claw; mouth parts often retractile. Cephalothorax and 
abdomen on the same plane with frequently no division between the 
two; dorsal surface of cephalothorax with a long median groove which 
usually ends in a tubercle at its ator ine end. Eyes sessile, sometimes 
six pairs present. 
This family is rich in species, most of which are found 
Im grass or upon the leaves of trees. 
RHYNCHOLOPHUS Dugés. 
Mouth parts not retractile; palpi of five segments; no eyes situated 
on the anterior margin of the cephalothorax. 
Nine well-characterized species. 
KEY TO SPECIES. 
1. Body elongated and strongly constricted at the insertion of the hind 
group of legs; setae of the body in the form of tridents 
R. tridentifer. 
Body shorter, if constricted at the insertion of the posterior group of 
legs, but slightly so; setae of body not forked YM 
