438 cobb: new nematode genera 



proximal third a little wider and uniform. Flemming to glycerine. The meas- 

 urements in parentheses are taken at the base of the spear. 



Habitat; distribution. Roots of Mango, Bangalore, India. The genus Iota 

 is widespread in acid soils, swamps, bogs, etc., and doubtless contains many 

 species, a number of which are known to the writer from various parts of the 

 United States, Europe, Australia and Oceanica. The males, in some species at 

 least, at the final moult, become much longer and slenderer, and lose the oral 

 spear. Many species onlj^ about 0.5 mm. long; relatively very wide and inflex- 

 ible, with coarse retrorse annules. 



5. Tylenchorhynchus cylindricus, n.g., n.sp. 



Wings indicated by two longi- 



/-_ .9 . ii.6/._. .17.8 ...-57- 94..3.... .7 mm. tudinal lines. Head with 



'^— .9 3.2 ~ 3.J 3.1 3.1 • ^ • •. , J , ■^■ 



minute six-ribbed, chitmous, 



C^ :| ^2'^'' = ^lii '^.5 ^Ili ^* "™* yellowish framework with in- 

 distinct posterior equatorial 

 band. Spear minute, barely knobbed at base- Median bulb prolate, half as 

 wide as the neck with an obscure elongated valve; cardiac swelling pyriform, 

 three-fourths as wide as the neck. Excretory pore — uncertain. Hot sublimate to 

 balsam. 



Habitat; distribution. A single species from the soil of reclaimed coastal 

 swamp lands. Southern California. 



6. Archionchus perplexans, n.g., n.sp. 



Papillae marginal, spreading. 



r-=,, 4.2 13.2/^ 25. 'bV 94.8 .5 ^. Amphids transverse, half as long 



" ' ' 43 ' as the head is wide. Pharynx 



^=■0 1^1 — •''b's = ^ai? — ^TTs ^a!i - '^ '°°' twice as deep as head is wide; 



surrounded by distinct, massive, 

 muscular sac, set off from the oesophagus by a constriction. Spear tooth- 

 like at the end of large, tubular apophysis, which is prominently expanded at its 

 base. Tooth and apophysis thrust forward together. Oesophagus^ tubular, one- 

 fourth as wide as the neck, widening gradually in the posterior third to half as 

 wide as the neck. . Oesophageal tube not passing through the tooth. Intestine 

 joining the middle of the posterior surface of the oesophageal swelling. Supple- 

 mentary organs two, one in front of the other, mammiform, opposite the posterior 

 half of the spicula. Spicula one and one-half times as long as the anal body diam- 

 eter, tapering slightly, rather blunt; proximal ends cephalated by constriction. 

 Flemming to glycerine. Resembles Chaolaimus, Cobb. 



Habitat; distribution. This species from the roots of pasture plants, Arling- 

 ton; citrus roots, Valencia, Spain. A widespread genus. 



7. Nemonchus galeatus, n.g., n.sp. 



Lips connate, amphids unknown. 



C;=. 5L.3....7.5/_ 11,6. ...r§4.-.. 9.5.9 5^,5 „jn. Spear relatively massive, four 

 .8 1. 1.3 1.5 1.. , ii i_ J • 



go tunes as long as the head is 



(;=- \'l {'"^--^^'X "2.2 ^iil 1-3 mm. wide; anterior portion about 



one-sixth as wide as the head, 

 somewhat more distinctly chitinized than posterior two-fifths which is twice 



