1904.] 



175 



Cladius, but divides Leptocercus intci Hemichroa and Cnmponiscus (= 

 Leptocercus, Knw.), and erects three of Thomnon's Nemafus groups 

 into genera, viz., Dineiira, Croesus, and Emira (== Crypiocampu.s, Knw.), 

 while leaving the rest to form a genns Nemntus, which is nearly (if 

 not quit(i) as long and as ])olyiiiorphic as the Nematus of Thomson. 



Genera according 



to Thomson. 



Ilyni. Scand., vol. i. 



Species as numbered in 

 ThoniSon'.s work. 



Genera acttording 

 to Konow. 



sp. 1 Cladius. 



Cladius ^ spp. 2-5 Trithiocampus. 



spp. 6-7 Priophorus. 



Leptocercus 



Nematus 



( spp. 1-3 Hemichroa. 



( sp. 4 Leptocercus. 



' spp. 1, 3, 4 Dineura. 



spp. lf'0-102 Cryptocampus. 



spp. ni-99 (also 7, 9, 10) Pontania. 



spp. 69-89 Pteronus. 



spp. 53-64 Amauronematus. 



spp. 5, 6 Crcbsus. 



spp. 48-52 (also 19) Holcocnemc. 



spp. 65-68 Nematus. 



spp. 39-47 (also 8, 30) Pachynematus. 



spp. 17, 20-25, 31-57 (except 35) Lygaeonematus. 



spp. 11-16, 18,26-29,35 Prist iphora. 



I sp. 38 Micronematus. 



It will often be found that when once we have succeeded in 

 malting out for certain to which of Konow 's genera a specimen is to 

 be referred, tlie difficulty of arriving at its specific name is practically 

 at an end. And I hope that the Synoptic Table given in my 4th paper 

 will suffice to carry collectors, who will take the trouble to work 

 through it point by point, thus far at least towards the determination 

 of a large proportion of their unidentified Nematides. But I must 

 own that some of the characters, until one becomes familiar with 

 them, require time and patience in their investigation, even under the 

 most favourable circumstances, /. e., even when the specimen is in fair 

 condition, and not so mounted (on card or otherwise) that it is im- 

 possible to see the characters at all. I may say here that lo determine 

 even the genus of many Nematids one ought to be able to see quite 

 distinctly (1) the outline of the clypeus and labrum, (2) one claw at 

 least [all round], (3) the sculpture of the head, scutdliim* and 



• A pin thrust Ihrouyh the scuteltum of a Neuiatid or Dolerid may make its ai)ecilic determi- 

 nation absolutely impossible. 



