On Parasitic Hymenoptera from Spitsbergen. 31 



yellowish patches on the dorsum. On segments 4-8 the 

 yellow area on e;ich side takes on the form of a well- 

 defined yellow maikiiig, reaching from tiie base to about the 

 middle of the segment, except on 4, where it is about tiiree- 

 quarters as long as the segment : on 5-7 the marking is 

 (leeply bifid, and the lower branch becomes progressively 

 shorter : on 4 and 8 the branches of the marking are com- 

 pletely separated at the base : on 9 the yellow marking is 

 reduced to a mere basal dot. Segment 10 is wholly black. 

 Ventral surface of segments 1 and 2 mostly yellow ; a broad 

 mid-ventral black band on 2; 3-8 yellow in the basal half 

 (or thereabouts) and black in the apical half (or there- 

 abouts); 9 and 10 black. 



Anal appendages blackish brown, about as long as seg- 

 ment 9 ; conical ; straight, except at the tips, which are 

 pointed and divergent. 



Vulvar lamina not at all prominent ; the posterior margin 

 straight in ventral view and slightly arched when seen from 

 behind. 



IV. — Results of the Oxford University Expedition to 

 Spitshergenj 1^21. — No. 25. Hymenoptera Parasitica-. 

 Ichneumonoidea . By James WateesTON, B.D., D.Sc. 



The thirteen specimens of parasitic Hymenoptera taken by 

 the Expedition are referable to three genera, whose study 

 presents very considerable difficulties. Moreover, the descrip- 

 tions of Holmgren — to whom mainly our knowledge of these 

 insects from Spitsbeigen is due — are insufficient for critical 

 work. Tlianks, however, to the kindness of Dr. A. lionian, 

 Stockholm, who has access to Holmgren^s types, three of the 

 })ossibly four species represented in the collection have been 

 determined. I desire to thank Dr. Eoman heartily for the 

 trouble he has taken. As Dr. Roman is at present engaged 

 in revising the Hymenoptera of Spitsbergen^ it is unnecessary 

 to offer now any descriptive or comparative notes on the 

 species recorded below. 



All the specimens were taken by Mr. C. S. Elton (whose 

 collecting was done at the head of Klaas Billen Bay, " Bruce 

 City '^), mostly from various flowers growing on a raised 

 shingly beach at from 0-60 feet. 



All of the thiee named species were originally described 

 from Spitsbergen, and J\Jr. Elton''s captures were apparently 



