An Amendation 



of 

 HOPLOLAIMUS DADAY 1905 nee auctores 



CONTRIBUTIONS TO A SCIENCE OP NEMATOLOGT, XIII 

 BY N. A. COBB 



In 1905 Daday proposed the new genus Hoplolaimus on the basis 

 of a single female nema from soil in Paraguay. 



Hoplolaimus was so imperfectly characterized that numerous 

 subsequent 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. 



iL _ ^ 8 -I 2 -- _ ~ 56- ~_ ! 8 -_i 



H. coronalus n. sp. ?-.* 2 -^~A' ' 3.3 2.4 L 

 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 

 three longitudinal wings, occupying a space, measured 

 midway on "the nema, one-third as great as the width 

 of the body. The optical expression of these wings the right laterai^horci of the 

 consists of four parallel lines, of which the two outer interesting u^pai'red^pheroi- 

 are rather distinctly crenate, while the two inner, f d a u r tTa P s hi S\s th a e n bod^ 

 occupying a little less than a third of the wing space, having connections fore and 

 connect with refractive cuticular alterations of the Se^gSfnffiSLrf 

 striae, which thus give rise to a rather distinct more ni icronr s acr d os8 nea see ir above 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 ithyei 

 female make a gradually smaller angle with the lateral line and finally encircla 

 the terminus in the lateral plane. Very slightly oblique longitudinal striae,! 

 due to the attachment of the musculature, are visiblenin: mast regions of- the 

 body. There are no dermal appendages and: no '.series /of pores-has beea! 

 seen in the cuticle, but there is an unpaired lateral organ a bexfch the female 

 and male. (See Fig. 1.) The cylindroid neck becoihes coaVex-conoid at the 

 rounded head, which is continuous ; ancj presents a central mouth, opening oiily> 

 very slightly depressed. The lip region however is a flat/ blimtisk; cone, about 

 twenty microns broad by eight mieroos Jiighjlit !&>aefc apart ;by a v&ry\distincb 



363 



