TENTHRKDINID.E. NEMATUS. 27 



C. Anterior wings with the 2nd areolet small, receiving 1 recurrent nervure ; 



the 3rd receiving 2. 

 Sp. 9. varipes. Nigra, ore pedibusque albo variis ; alis hyalinis. (Long. corp. 



2 — 2^ lin. ; Exp. Alar. 4^ — 5^ lin.) 

 Pr. varipes. St. Fargeau. — Steph. Catal. 328. No. 3708. 

 Head, thorax, abdomen, and antennse black ; legs black, varied with white ; 

 mouth varied with white ; wings hyaline. 

 Not common : found in June at Hertford. 



Genus XII.— NEMATUS, Leach. 



Antennw 9-jointed, elongate, slender, simple, 2 basal joints short, 3rd longest, 

 remainder gradually diminishing in length to the apex ; head small, trans- 

 verse : mandibles dentate : ocelli 3 : wings ample, anterior with 1 large 

 marginal areolet, and 4 submarginal ones, the 1st small, rounded, the rest 

 in general nearly equal to each other, the 2nd receiving 1 recurrent nervure, 

 the 3rd 2; this last areolet is occasionally minute : body short, subcylindric 

 in the males, broader and depressed in the females : legs simple : tibiw with 

 2 sharp spurs at the apex only. 



It appears to me that this genus may be distinguished from Pristi- 

 phora by the simplicity and nakedness of the antennae, exclusively of 

 the variation in the neuration of the anterior wings, which, although 

 constructed upon the same model as in Pristiphora, differ in possessing 

 a distinct rounded submarginal areolet ; for the variations that occa- 

 sionally take place in some of the first species, by the rudiments alone 

 of a nervure being perceptible,* ought not to militate against the 

 general rule, especially when we find there is a prevalent diversity of 

 habit between the insects of the respective genera, Pristiphora being 

 more closely allied to Cladius than to Nematus. 



Sp. 1. pallipes. Nigra, pedibus tesfaceis, alis hyalinis, vervuris pallidefuscis, 

 stigmate fusco. (Long. corp. 2§ — 3§ lin.; Exp. Alar. 5 — 7 lin.) 



Ne. pallipes. St. Fargeau.— Steph. Catal. 328. No. 3790. 



Head, thorax, abdomen, and antennae black ; legs pale ; wings hyaline, 

 whitish, with pale fuscous nervures ; stigma brown. 

 Not uncommon throughout the metropolitan district in June, 



frequenting willows. 



Sp. 2. bicolor. Niger, ore albo vario, pedibus albo maculatis. (Long. corp. 2| 



— 3 lin.; Exp. Alar. 5 — 5^ lin.) 

 Ne. bicolor. St. Fargeau Man. 62. — Steph. Nomen. 2d edit. Appendix. 



* In my collection are numerous examples in almost every genus of the 

 Terebrantia, of variations in the number of areolets. 



