224 KEY TO THE MALES 



TJRSA PRESEN: spcua two, equa; ta more or ess arcuate-cono; no sp 

 Accessories pres.; no suppl.; spicula li long as anal body width, straightish; -m 

 Accessories none; spicula 2 CC as long as anal body diameter, cephalated by con 

 Supplements 0; spicula L-form; -m; post, half of tail cylindroid; terminus rou 



New Genera 

 BTJRSA PRESENT: spicula two, equal; tail more or less arcuate-conoid; no spinneret 



-m. . Aphele.nchulus 81 



nstriction 



Supplements 0; spicula L-form; -m; post, half of tail cylindroid; terminus rounded. lotonchium 82 

 Supplements 2()2,1 ;2, clav.-digit., apic.; ?'m; spicula obsc., straight; terminus blunt. Myolaimus 60 

 BURSA NONE 



Spiculum one, straight, uncephalated, 'm; spinneret none; tail acute 



Accessories pres.; 1;()1;1, simple (postanals, single); spicula 2 ee anal body width. .Cephalobellus 23 

 Accessories none; supplements present, papilloid; found in insects 



Supplements 2();2; spiculum one-fourth as long as anal body diameter; tail conoid. Blattophila 55 

 Supplements simple; spiculum twice as long as anal body diameter 



Anus 90; 1(),1;1; small access. (?); tail hemispheroid, then conoid; terminus conical. Protrellus 38 

 Anus 80; accessories (?) ; tail conical, its terminus pointed ...................... Cephalobellus 23 



Spicula two, equal, more or less arcuate (exc. Cophonchus, Synonchium, lotalaimus, Ironella, Bol- 



binium, Myctolaimus?) 



The spicula jointed, long, not distinctly cephalated, of uniform width; spinneret present 

 Supplements none; -m-; terminus clavate; spinneret armed; accessories apophysate ---- Xinema 47 



Supplements 25, vent., preanal, simple, rather faint; -m: tail conoid; aces, not &pophys..Rhips 118 

 The spicula not jointed; tail conoid or subconoid (cylindroid posteriorly in Amicyathus, Anti- 

 cyclus, Cophonchus, Cyartonema, Gonionchus, Daptonema, Halanonchus, Ironella, Anaxon- 

 chium, Monhystrium, Schistodera, Pepsonema, Myctolaimus, Rhabdocoma, Bolbella, Thoonchus, 

 Trilepta, Mesonchium, Cytolaimium, Tripyliu'm, Zygonemella, Synodontium and (?) Xennella) 

 Accessories to the spicula none, or very faint 

 Supplements present; spinneret absent, except in Synonchium 



Supps. dorylaimoid; spic. cephalated by expans., width unif.; -m-; term, rounded . Beryllium 84 

 Supps. all ventral; spicula about H-2 ce as long as anal body diameter, uncephalated 

 Position of supps. not preanal only; 4 preanal, simple; 1 postanal, not simple; =m? . Colpurella 39 

 Position of supplements preanal only; supplements simple 



No. of supps. 4; spicula not of uniform width; ? = m; tail rather irreg. conoid .Colpurella 39 

 No. of supps. 2; spicula straight, width rather unif.; tail conoid-hemispherical Synonchium 73 

 Supplements none or exceedingly faint 



Spicula slightly cephalated by expansion, unif.; tail conoid, then cylindroid; -m-. Zygonemella 26 

 Spicula not cephalated 



Width of the spicula not uniform; spinneret absent (?) 



Spicula straight; about \ as long as anal body diam.; tail short, bluntly conoid. Bolbinium 16 

 Spicula arcuate; -m ; tail conoid, then cylindroid, its term, rounded, J as wide as base . Trilepta 92 

 Width of the spicula more or less uniform; spinneret present, except in Triplonchium 

 Spicula straight; tail conoid-hemispherical; term, broad; spinneret a pore. . (Synonchium) 73 

 Spicula arcuate 

 Spinneret absent 

 Spicula very strongly arcuate; bursa (?) ; terminus broad, rounded; -m ---- (Triplonchium) 80 



Spicula not very strongly arcuate; no bursa; terminus not broad ............ (Rhabdocoma) 32 



Spinneret present; spicula not strongly arcuate; no bursa 



Anus 85; tail conoid, then cylindroid; width over 5%; spic. only slightly arcu.. Zygonemella 26 

 Anus 97; term, broad, rounded; width about 1%; -m; single questionable supp. . Nemanema 2 

 Accessories to the spicula present 



Supplementary organs present near the anus (for alternative see middle opposite page) 

 The supplements not all ventral; spicula 1J-1| as long as anal body diameter 

 Position, preanal; not simp.; 2 rows 38 ea.; non-unif. spic. uncephalated; -m ...... Polysigma 106 



Position, not preanal only; no spinneret (except in Catanema and (?) Cytolaimium) 

 Form of supplements simple; -m-; spicula uncephalated, width rather uniform 

 Supplements papilloid, 5 preanal, 4 postanal in pairs .......................... Isolaimium 41 



Supplements discoid, 11 pre-,5 postanal pairs; spic. 1J long as anal body diam.. Cytolaimium 31 

 Form of the supplements not simple 



Spicula not cephalated ; 16 pairs of supplements; terminus barely swollen ; -m- . Cytolaimium 31 

 Spicula cephalated 



Cephalated by constriction, straight?, width not uniform; 9 pairs papillae; ' m. Myctolaimus 61 

 Cephalated by expansion: width of spicula rather uniform 



Arrangement of papilloid supps. 1,1,1,1,1.1,1(1),2,1,1;3,; 'm; term, hooked . CJiambrsi(lln 64 

 Arrangement of tub. supps. postanal, submed., about 7 prs.;-m; term, straight Catanema 56 

 The supplements all ventral; spinneret present (exc. Anticyathus, (?) Anticyclus, Neurella) 

 Position, preanal 17, postanal few, simple; spicula uncephalated, tapering (?); -m-.Anticych>s 111 

 Position of supplements preanal only 



Structure of supplements not simple (for alternative see page 225) 

 Proximal ends of the spicula not cephalated 



Width not uniform, length 1? anal body diam.; 37 " campanulate " supps.; -m. Alaimonema 107 

 Width of the spicula more or less uniform 



No. of supplements 1; spicula 2| times as long as anal body diam. .straight; =m (Ironella) 63 

 No. of supplements 4 or more; terminus more or less blunt 



Apophysis present; spicula 3 ce as long as anal body width; supps. 12; 'm. . Aponchium 79 

 Apophysis none; spicula long as anal body diam. ; ace. prom. ; supps. 4 ; -m . Acanthonchus 101 

 Proximal ends of the spicula cephalated 



Spicula cephalated by constriction, twice as long as anal body diameter 



Supplements 2, not simple; spicula rather uniform, their cephalation faint; -m- . Bolbella 90 

 Supplements 6, mammiform; width of spicula not uniform; -m(?) .......... Xanthodora 98 



Spicula cephalated by expansion or contraction; width of spicula rather uniform 

 Cephalated by contraction, strongly arcuate, as long as anal body diam. ; -m . (Stilbonema) 19 

 Cephalated by expansion 



Supplement one, tubular; spicula nearly straight; tail conoid, then cylindroid 

 Length of spicula 5-6 anal body diameters; -m-; spinneret bluntly conoid. . .Cophonchvs 108 

 Length of spicula 2j anal body diameters; =m; supplement bent toward anus. .Ironella 63 



