NEMATUS COLLINUS. 167 



the true salicis, he re-named the insect. Thomson, however, considers 

 that De Geer's species was the true Linnean salicis, so that on this 

 view the salicis of most of the authors required another name. This, 

 however, seems to me to be a very doubtful point, and I have conse- 

 quently adopted Hartig's name as one about which there can be no 

 doubt, while also the adoption of this designation will cause the least 

 confusion. 



80. NEMATUS COLLINUS. 

 PL IV, fig. 5, ? ; PL XXIV, fig. 7, Saw. 



Nematus collinus, Cam., Trans. Ent. Soc., 1882, 534. 



Luteous, the head (mouth excepted), antennae, the breast, metapleurae 

 more or less, three longitudinal marks on mesonotum, scutellum, meta- 

 notum in centre, apex of posterior tibiae and tarsi, black ; apex of cly- 

 peus, labruin, coxae, trochanters, tibiae, and the greater part of four 

 anterior metatarsi, white. Wings hyaline, costa testaceous at base, apex 

 fuscous, stigma black ; third cubital cellule much longer than broad, 

 and much wider at apex than at base, recurrent nervures in hinder wing 

 received close to each other. Antennae shorter than thorax and abdo- 

 men, stout, tapering at apex, the third joint shorter than fourth. 

 Clypeus slightly and broadly incised. Spurs more than one-third of 

 the length of metatarsus, and a little longer than cerci. Apex of 

 sheath black. 



Length 3- 3f lines. 



Similar to N. melanocephalus, but smaller, antennse 

 if anything longer, the mesonotum not entirely black, 

 third cubital cellule much longer, and narrower at the 

 base compared to width at apex, spurs a little longer 

 and sharper at apex, and the recurrent nervures in 

 hinder wings received closer to each other, clypeus 

 almost transverse, &c. It has a superficial resemblance 

 to N. ribesii, but that species is readily separated from 

 it by the pale antennse and yellowish scutellum and 

 metanotum. The black marks on lateral lobes of 

 metanotum are sometimes united to scutellum, which 

 may be entirely black, or its apex may be luteous, and 

 the metanotum entirely black or only the space around 

 the cenchri. The amount of black on breast and sides 

 also varies. 



Rare. On birch in June. Craig Dhu, Kingussie, 

 Cladich, Loch Awe. 



