A. TULLGREN, HYMENOPTERA ACULEATA FROM THE CAMEROONS. 455 



nearly confluent in the middle-line on the back. The ventral 

 side of this segment with a light yellow transverse band at 

 the posterior margin. Tlie dorsal side of the fonrth segment 

 with an indistinct yellowish spöt at each posterior angle and 

 tliat of the 5th and 6th segment with a transverse yellow 

 spöt on each side. The legs are light brown exeept the 

 blackish tarsi. The wings are yellowish. The clypeus 

 yellow. 



In the coloration the specimen agrees a little more with 



B. pictus Kohl than with B. pnsillns Kohl, but the shape 

 of the clypens and the measurements of the joints of the 

 antennse, the cheeks etc, are nearly perfectly agreeing with 

 that of this species. 



Length 21 mm. 

 Exp. 36 mm. 



Geographical Distribution. — West-Africa: Sierra Leone. 



B. occidentalis. Tullgr. n. sp. (Pl. 25, fig. 14.) 



This species is very nearly related to B. dubius Kohl 

 and to two species described by Saussure — B. Guerini Sauss. 

 and ssevus Sanss. — and unfortunately the descriptions of 

 theni are too insufficient for a sure distinction between the two. 

 And to identify with certainty a species described as deficiently 

 as B. ssevus Sanss. in Grandidier, Hist. nat. Madeg., fasc. 20, 

 p. 92 is nearly impossible not having a type-specimen for 

 comparison. B. seevus is nearest related to B. Guerini. To 

 that species the specimens from the Cameroons are very si- 

 milar. But still more it is related to B. dubius, to which 

 species I at first counted it. Mr. Kohl has kindly compared 

 these two and this author thinks it to be a new one. 



Female. — Dark reddish brown; the thorax and the last 

 abdominal segments nearly black; partly clothed with a very 

 short grayish pubescence. The tarsi and tibise black. 



Male. — Similar to the female but with two longitudi- 

 nal straw-coloured bands on the clypeus. 



According to Mr. Kohl that species is smaller and of a 

 darker colour. The distance between the eyes on the vertex 

 is broader than by B. dubius. 



