MAY 19, 1923 COBB: AMENDATION OF HOPLOLAIMUS 211 
ZOOLOGY.—An amendation of Hoplolaimus Daday, 1905, nec 
auctores. N. A. Cons, U. S. Department of Agriculture. 
In 1905, Daday proposed the new genus Hoplolaimus on the basis 
of a single female nema from soil in Paraguay; the characterization was 
necessarily imperfect. Daday could give only the location of the vulva 
and state his belief that the unseen female organs were double.* The 
mouth parts were such that so experienced an observer as Daday 
readily concluded he had found a new tylenchoid genus. Hence, 
Hoplolaimus. 
Hoplolaimus was so imperfectly characterized that numerous subse- 
quent authors have referred to it a variety of species that seem certain 
not to belong to it, in the light of recent discoveries now to be described. 
Hoplolaimus Daday 1905 amend. 
Coarsely annuled typical tylenchidae with a prominently set off, lobed 
lip-region composed of several annules, and an onchium with more 
or less lobed basal bulbs. -f-and-m. Males with 
lobed bursa encompassing the tail. Type species 
H. coronatus n. sp. 
H. coronatusn. sp. 2-4 22% /3 3.3 2.4 
The transparent colorless layers of the naked cuticle = 
are traversed by plain, transverse striae, all alike, 
about three microns apart and easy of resolution, which 
are not further resolvable, and which are altered | : 
materially on the lateral fields by the presence of *13007 1 
three longitudinal wings, occupying a space, measured fre. 1. In the left lateral 
midway on the nema, one-third as great as the width chord, (usually) of the male 
Hoplolaimus at lat. 86, and in 
of the body. The optical expression of these wings theright lateral chord of the 
: . : female at lat. 32, there is an 
consists of four parallel lines, of which the two outer interesting unpaired spheroi- 
ae . . dal amphid-li , one- 
are rather distinctly crenate, while the two inner, $3 pee ote bode, 
occupying a little less than a third of the wing space, haying counsetions fore /ane 
connect with refractive cuticular alterations of the the wingregion in the formof 
striae, which thus give rise to a rather distinct more 2, depressed _near-circle, | 8 
or less quadrangular network on the lateral fields. 
On the neck the wings become reduced to two. The cuticle, about two and 
one-half microns thick, is striated internally as well as externally. As usual, 
the annules close to the lip region are somewhat narrower than those farther 
back. From somewhat behind the anus the final striae on the tail of the 
female make a gradually smaller angle with the lateral line and finally encircle 
the terminus in the lateral plane. Very slightly oblique longitudinal striae, 
due to the attachment of the musculature, are visible in most regions of the 
body. There are no dermal appendages and no series of pores has been 
seen in the cuticle, but there is an unpaired lateral organ on both the female 
and male. (See Fig. 1.) The cylindroid neck becomes convex-conoid at the 
rounded head, which is continuous and presents a central mouth opening only 
very slightly depressed. The lip region however is a flat, bluntish cone, about 
twenty microns broad by eight microns high; it is set apart by a very distinct 
