448 ARKIV FÖR ZOOLOGI. BAND 1. 



is furnished with three forwards directed very slender and 

 pointed horns equal in length. Two are situated on the base 

 of the niandibulse. The third one is in the superior margin 

 of the clypeus, is in some degree directed npwards but 

 slightly curved downwards. The female has no horns, bnt 

 clypeus has a strong conical protuberance in the middle. The 

 developed horns are a little shorter than the niandibulse. These 

 are perfectly straight as by S. cornuta. 



The interval between the two posterior ocelli a little 

 shorter than the distance from the eyes. The longest inter- 

 val between the eyes on the vertex very little longer than 

 the length of the joints 2 + 3 of the flagellum by the male. 

 By the female it is as long as the joints 2 + 3 + 4 of the 

 flagellum. By both sexes of S. cornuta this interval is 

 as long as the joints 1 + 24-3 and the half 4 of the fla- 

 gellum and the interval between the posterior ocelli nearly 

 thrice shorter than the distance from the eyes. The face is 

 by S. trispinosa niuch narrower than by S. cornuta. 



The metathorax is bidentate and the postcutellum with 

 two mammillary protuberances. By this species all margins 

 on the median segment are much more pointed than by S. 

 cornuta. 



In the nervature of the wings there are no diflerences 

 from the preceding species. 



Length (f 25 mm.; $ 26 mm. 



Exp. o 71 49,5 mm.; $ 50,5 mm. 



S. rufopicta Tullgr. n. sp. (Pl. 24, fig. 10 a, b.) 



This species is very nearly related to S. cornuta, but 

 diifers principally by the bidentate postscutellum and by the 

 shape of the clypeus. 



Only a single female from Kitta ( 25 /3 1891). 



Female. — Black with the foliowing parts ferrugineous- 

 red: the legs, the head except the front and the vertex, the 

 thorax except the mesonotum, which for the most part is 

 black, the best part of the first abdominal segment and two 

 very indistinct spöts on the ventral side of the second one. 



The mandibuléB are straight. The clypeus is ovate, in 

 the superior margin a little sinuated, at the apex slightly 

 emarginated; upwards projecting between the antenns as a 



