NEMATUS CRASSUS. 81 



grooved. Stigma blade, costa testaceous, clypeus in- 

 cised, sutures distinct, thorax covered with close longish 

 pubescence, finely punctured on mesonotum and pleurce. 

 Antennae long and filiform. Length from 5 lines. 



The large size of the two species composing this 

 group easily separates them from the other black- 

 bodied species with red legs. 



1 (2) Coxse, trochanters, and spurs black. Crassus. 



2 (1) Coxse, base of trochanters, and spurs red. Caeruleocarpus 



24. NEMATUS CKASSUS. 

 PL XVII, fig. 6, Saw. 



Tenthredo crassa, Fall., Acta Holm., 1808, 106, 41. 



Nematus sulcipes, Hart., Blatt., 186, 6 ; Evers., Bull. Mosc., xx, 

 14,3; Andre, Species, i, 114; Cat., 

 14*, 24. 



crassus, Thorns., Opus., 629, 33 ; Hym. Scand., i, 123 ; 

 Cam., Proc. Nat. Hist. Soc. Glas., 

 ii, 312 ; Fauna, 36, 31 ; Andre, 

 Species, i, 113; Cat., 14,* 22. 



Antennae black, nearly as long as the body, tapering towards the 

 apex, the third joint curved, scarcely longer than the fourth. Head 

 black, shining, slightly punctured, frontal fovese broad, distinct ; 

 antennal rather deep ; clypeus incised ; the apex of labrum and 

 mandibles at the apex reddish; palpi testaceous. Thorax black, 

 shining, punctured, covered with short black pile ; the pleurae are 

 densely pilose and opaque; the scutellum raised, opaque, and punc- 

 tured; the cenchri large, clear white. Abdomen black, shining, a 

 little narrowed at the apex ; sheath of saw hairy and projecting, the 

 cerci are short and black. Legs red; the coxae, trochanters, and 

 apical half of posterior tibiae, with the spurs and the whole of the 

 posterior tarsi, black; the four anterior spurs are reddish. The poste- 

 rior tibiae are thickened at the apex, pilose, and deeply grooved 

 inwardly ; the inner spur is double the length of the outer, and is 

 nearly half the length of the metatarsus. Wings yellowish hyaline, 

 iridescent, costa reddish- testaceous ; the stigma black ; the first trans- 

 verse cubital nervure is absent, and the second recurrent nervure is 

 received considerably in front of second transverse cubital. The 

 tegulae are black. 



The <^ is similarly coloured ; the antennae are longer, and the body 

 is, if anything, more pilose. 



Length 4^ 5 lines. 



This is apparently a northern form in Britain, and 

 has only been met with at Braemar and at Kingussie, 

 where I found it in June on aspens. 



VOL. II. 6 



