438 ARKIV FÖR ZOOLOGI. BAND 1. 



gellura. The median segment narrower than by the female. 

 The postscutellum with a low conical protnberance. The 

 wings as by the male of S. oehropns Stål. 

 Length 30 mm. Exp. 60 mm. 



In account of the coloration, the shape of the month-parts 

 and thorax 1 count these males for the present to this 

 speeies. 



S. nigricans Tullgr. n. sp. (Pl. 22, %. 3 a, b). 



Male. — Black; the clypens, labrum, mandibulse except 

 the apices, a stripe along the inner margin of the eyes and the 

 scapi are dark brown. The legs except the coxee are dark 

 red- bro wn. The clypeus and the face below the antennse with 

 a short brownish pubescence. The vertex, the pronotum and 

 the dorsal side of the median segment with black hairs. The 

 sides and the venter of the thorax probably with a bright 

 short brownish pubescence. The legs with a very short 

 grayish one. 



Clypeus very broad with the upper margin arcuate a 

 little emarginated at the sides, straightly truncated below. 

 The labrum a little emarginated in the middle. The interval 

 between the eyes on the vertex as long as the second + a fourth 

 of the third joint the nagellum. The eyes nearly reaching 

 the base of the mandibulse. The interval between the poste- 

 rior ocelli not so long as the distance from the eyes. 



The pronotum very broad with the hind-margin slightly 

 arcuate. The postscutellum with a conical protuberance in 

 the middle. The median segment very little longer than 

 broad, above with fine transverse wrinkles. On the ventral 

 space of the last abdominal segment but one there is on each 

 side a large acute keel pointing backwards. The space be- 

 tween these keels is smooth. The hypopygium rounded behind, 

 not incised in the middle. 



The wings are dark fuscous with a bluish effulgence(?). 

 The third cubital cell reaches a little över the radial one 

 and the second transverse cubital nervure touches the radial 

 nervure in the middle of the part that forms the anterior 

 margin of the 2d and 3d cubital cell. 



The longest tibial spur on the posterior pair of legs 

 much shorter than the half of the metatarsi. The claws 



