NEMATUS THOMSONI. 87 



27. NEMATUS THOMSONI. 

 PL XVIII, fig. 2, Saw. 



Nematus Thomsoni, Cam., Trans. Ent. Soc., 1882, 540. 

 hyperboreus, Cam., Fauna, 32, non Thorns. 



Black. Labrum, anus, tegulae and edge of pronotum, legs, costa 

 and stigma white ; anterior femora largely, posterior nearly all, black. 

 Antennae a little longer than half the body, setaceous, the third and 

 fourth joints equal, the rest shorter. Head a little narrower than the 

 thorax, slightly rounded inwardly behind, black, shining, covered with 

 longish pubescence ; labrum dull white, palpi dark fuscous, front and 

 vertex slightly rugose, sutures and fovea3 not deep, pentagonal area 

 invisible. Thorax shining, smooth, covered with longish scattered 

 greyish pubescence ; the posterior edge of pronotum and tegulse white, 

 cenchri large, white. Abdomen oblong, broad, truncated at apex, black, 

 smooth, shining, very minutely punctured ; anal segment sordid white ; 

 the cerci long, white, pointing towards each other. Sheath black, hairy, 

 slightly exserted. Legs sordid white, the coxae at the base, about one- 

 third of the anterior femora, posterior almost wholly, anterior tarsi at 

 apex, the posterior entirely, and the apex of the posterior tibiae, black ; 

 the spurs are short. Wings hyaline, the costa and stigma white, ner- 

 vures blackish ; the third cubital cellule is double the width of the base 

 at the apex. 



Length 3| lines. 



Easily known by its broad, short, black, shining, 

 longly pilose body, with the anal segment broadly 

 white, villose pleurae, shortish antennae, and dirty white 

 legs with black posterior femora. 



It is closely related to N. villosus, Thorns. (Hym. 

 Scand. i, 127, 53), but that species is larger, the 

 pleurae not alutaceous, the tegulae black, the abdomen 

 black at the apex and the legs yellowish, black at the 

 base. N. hyperboreus, Thorns., differs from it in having 

 the pronotum entirely black, the thorax " supra sub- 

 tilius sed crebrius punctato," &c. 



TV". Thomsoni is very rare in Britain, only two 

 specimens having been hitherto discovered. These 

 were taken by Dr. Sharp in Braemar. 



