L/sso/io/a.] 



BRITISH ICHNEUMONS. 



185 



Nearly all our species are found only in the late summer and autumn, 

 though that there are exceptions is proved by my capture o{ L.hellaiordLXxd 

 L. varicoxa in the middle of June. Few appear to be rare and then more 

 on account of the difficulty arising from originally inadequate descriptions 

 than lack in prevalency of the insects. 



I have found the species already recorded from Britain to include all 

 those I have had occasion to examine, though of course the old lists also 

 contained many now considered to belong to distinct genera, with I think 

 but a single exception in the puzzling L. segmcntator-gxow^, which will 

 doubtless yield more species when adequately investigated. It is in this 

 group, more perhaps than any other in the Lissonotides, where the ques- 

 tion of constancy in the terebral length is in need of settlement : I myself 

 am convinced that it varies not the slightest in females of a single species. 



Table of Species. 



(6). I. Radial ner\'ure arcuate above areolet 

 (tigTired) ; thorax profusely flavous- 

 marked. 



Metathoracic spiracles elongate ; ab- 

 domen not contiuently punctate . . 



Metathoracic spiracles circular ; ab- 

 domen confluently punctate. 



Postscutellum flavous ; legs and an- 

 tennae normal 



Postscutellum black ; legs and anten- 

 nae elongate 



Radial nervure not arcuate (figured) ; 

 thorax less flavous-marked. 



Abdomen centrally more or less broad- 

 ly red. 



Vertical orbits immaculate ; terebra 

 usually shorter than body. 



Central segments quadrate or trans- 

 verse ; areolet distinct. 



All the tibiae basally white ; face and 

 cheeks sparse!}' pilose 



All the tibiae uniformly red or infus- 

 cate. 



Face and cheeks densely pubescent 



Face and cheeks sparsely pilose. 



Thorax and scutellum immaculate . . 



Thorax and scutellum each with two 

 white marks . . 



Central segments elongate. 



Areolet petiolate and obsolete ; seg- 

 ments black-marked. 



Terebra shorter ; J face pale-marked ; 

 length 6 mm. 



Terebra longer; J face immaculate; 

 length 3 mm. 



Areolet entire and often sessile ; cen- 

 tral segments immaculate red. 



1. PARALLELA, Grav. 



2. LiXEATA, Grav 



3. INSIGNITA, Grav. 



4. i.ELCOGONA, Grav. 



5. FLETCHERI, Bridg. 



6. viciNA, Holtngr. 



7. QUADRINOTATA. Gr. 



8. LINEARIS, Grav. 



9. OI5SOLETA, Bridg. 



