KEY TO THE MALES 225 



New Genera 



Supplements numerous, 8-21 



Length of spic. 2 ce anal body width; proximae hooked; supps. 21, flat; -m-. Trogolaimus 75 

 Length of spicula 1-1 i times as great as the anal body diameter 



No. of protrusile(?) tub. supps. 8; ace. | as long as spic., bends away; -m' . Antomicron 17 

 No. of faint, non-tubular supps. 16; ace. parallel, J as long as spicula ;-a\-.Gammanema 74 

 Structure of supplements simple 

 Proximal ends of the spicula not cephalated 

 Width of spicula not uniform 



No. of supplements one, flat, faint; accessories, simple, faint; =m(?) Neurella 25 



No. of supplements 17, low, papilloid ; spinneret (?); term, slightly swollen. .(Anticyclus) 111 

 Width of spicula more or less uniform 



No. of supplements two, obscure; accessories stout; term, convex-conoid, acute. .Nudora 113 

 No. of supplements 15-20; terminus not acute 



Length of the spicula twice as great as the anal body diameter; 'm Anaxonchium 99 



Length of the spicula as great as the anal body diameter; -m- Halanonchus 51 



Proximal ends of the spicula cephalated 



Cephalated by constriction, about 1J as long as anal body diameter; supplements 6-40 

 Width of spicula rather uniform; accessories 2, apophysate; -m; term, blunt. Margcnema 27 

 Width of spicula not uniform 

 Accessory with apophysis; -m-; tail fine, cylindroid; term, blunt; no spin. (Anticyathus) 24 



Accessories without apophysis, two; terminus convex-conoid, acute Bolbolaimus 100 



Cephalated by expansion or contraction 

 The cephalatiqn is by expansion 



Width not unif.; supps. 5-6; -m-; accessory with apophysis; spinneret armed . Halinema 52 

 Width of spicula uniform or apparently so 



No. of supplements 3; spicula 15 times as long as anal body diameter; -m Rhynchonema 43 

 No. of supplements 25-65; spicula 1 or 1J times as long as anal body diameter 

 Apophysis to the accessory present; -m-; spinneret armed, 3-lobed .... Synvdcnlium 65 



Apophysis to the accessory none; -m; spinneret unarmed; anus raised Mesodorus 105 



The cephalation is by contraction; width of the spicula not uniform 

 No. of the supplements 1-3 



Spicula lj times as long as the anal body diam; supps. mere innervations Ypsilon 96 



Spicula twice as long as the anal body diam; single elevated supp; -m- Thoonchus 91 



No. of the supplements 4 or' more; spicula tapering both ways 



Spicula long as anal body diam; accessory apophysate; -m-; no spinneret.. Anticyathus 24 

 Spicula twice as long as anal body diameter; accessory not apophysate 

 Anus 98; width 1.6%; -m-; single elevated supp; 2 dozen innervations. . . .Thodncfius 91 

 Anus 92; width 3.8%; -m; series of ventral supps.; nar. spinneret-tube. .Micromicron 104 

 Supp. organs 0; spinneret pres. (exc. Crystallonema, Triplonchium, lotalaimus, Cephalobium) 

 Inner ends of the spicula not cephalated, or not obviously so 

 Width of spicula not uniform; spicula 1-li times as long as anal body diameter 

 Form of spic. subarcuate; spin, midway on tail, ventral; 'm-; term, rounded . ..Trissonchulus 78 

 Form of spicula arcuate 



Apophysis to accessory extends backward; spicula 1-1 J long as anal body diameter 

 Spinneret none; term, unarmed; -m; spic. strongly arcuate; no caudal setae. Crystallonema 67 

 Spinneret present; term, faintly armed; -m-; minute, inconspic. caudal setae . Linhomoella 35 

 Appphysis to accessory none 



Wings to the cuticle present, also in anal region; spicula strongly arcuate Xennella 6 



Wings to the cuticle none 



Accessory inconspicuous; spinneret (?); terminus j as wide as base of tail; -m. .Trilepta 92 

 Accessories parallel, then bent away ; spin, armed; term. J wide as base; -m. . . . (Stilbonema) 19 

 Width of the spicula more or less uniform 



Length of spicula 2-3 times as great as anal body diameter; ace. with backward apophysis 

 Form of spic. straight thr. middle, arc. dist.; 3 ce long as anal body diam.; -m-.Mesonchium 76 

 Form of spicula arcuate throughout, about twice as long as anal body diam. ; -m . Cyartonema 18 

 Length of the spicula 1-J-1J times as great as the anal body diameter 



Accessories massive; supps. 2, obscure; term, convex-conoid; spin, large, acute (Nudora) 113 



Accessories obscure; no suppelments; terminus blunt 



Form of spic. very strongly arcuate; rudiment, bursa pres.; no spinneret ;-m Triplonchium 8 

 Form of spic. not strongly arcuate, rather stout, blunt; no bursa; spinneret?. Rhabdocoma 32 

 Inner ends of spicula cephalated; spinneret present, except in lotalaimus and Cephalobium 

 Proximal ends of the spicula cephalated by constriction, width not uniform 

 Length of the spicula twice or nearly twice or great as anal body diameter 

 Apophysis to ace. tapering; tail not striated; spinneret swan's-head form, unarmed . Nemella 10 

 Apophysis to ace. none; tail striated; spin, elongated-conoid, armed; -m. .Ptycholaimellus 116 

 Length of the spicula 1J times as great as anal body diameter 



Form of spicula straightish; 'm; term, blunt, nearly J as wide as base; no spin.. lotalaimus 15 

 Form of spicula arcuate 



Spinneret none; -m; terminus acute, unarmed; width of the body 3% Cephalobium 54 



Spinneret present 



Spinneret tub.; anus 90; width of body more than 3%; term, unarmed; -m. .Monhystrium 69 

 Spinneret simple; width of body less than 1% 



Termjnus swollen ; accessories 2 ; anus 95% ; caudal setae faint, anal only ; -m-? . Schistodera 

 Terminus not swol.; ace. 1, more massive dist.; anus 97.5; setae not anal only Laxonema 20 

 Proximal ends of the spicula cephalated by contraction or expansion 

 Ends of the spicula cephalated by contraction (for alternative see top next page) 

 Width of the spicula uniform ; spicula about as long as anal body diameter 

 Anus 98; -m ; cephalum short, faint; anal annules strongly modified ventrally. .Stilbonema 1 



Anus 94; -m-; cephalum elongated, contraction distinct Cinctonema 22 



Width of the spicula not uniform 



Length of the spicula twice the anal body diameter; -m-; terminus rounded. . (Thoonchus) 9 

 Length of the spicula equaling anal body diameter 



Cuticle = | radius; annules \ anal body width, elements not tile-shaped. Achnonema 117 

 Cuticle less than } radius; annules } anal body width, elements tile-shaped Ceramonema 48 



