Mr. A. E. Eaton on some British Neuroptera. 395 



LVIII. — On some British Neuroptera. 

 By A. E. Eaton, of Trin. Coll. Cambridge. 



In the collection of Neuroptera in the Zoological Museum of 

 the Cambridge University there are some British insects which 

 deserve mention on account either of individual peculiarities or 

 of their being unrecorded hitherto as natives of this country. 



Tribe PLANIPENNES. 



Family Hemerobiidae. 

 Genus Chrysopa, Leach. 



C vittata, Wesmael. 



A specimen of this insect has the third cubital cell of the 

 fore wing normal on the right side ; but on the left the partition 

 vein receives two transverse nervures, the additional one being 

 near the apex of the cell. 



C. phyllochroma, Wesm. 



Another example of the above arrangement of nervures is met 

 with in both fore wings of an insect of this species. 



Family Panorpidae. 

 Genus Panorpa, L. 



The structure of the last three segments of the body, espe- 

 cially of the last one, presents peculiarities which serve to distin- 

 guish the males of the several species of this genus. 



At first sight the terminal segment seems to be merely an 

 oval or pyriform forcipate mass with two appendices beneath ; 

 but upon a close examination it is found to be far more com- 

 plicated. The segment proper is comparatively small, and is 

 mitriform, the horns of the mitre being respectively dorsal and 

 ventral. The dorsal horn carries near its end two minute ap- 

 pendices superiores (app. sup.) ; the ventral horn, in a like man- 

 ner, supports two long appendices inferiores (app. inf.). The 

 sides and base of the mitral cleft bear the enormous two-jointed 

 appendices intermedise (app. interm.), which, together with the 

 seventh and eighth segments, constitute the well-known forceps. 

 Their basal joints are convex without and concave within, and 

 enclose a considerable hollow space, in which lie the penis and 

 its sheaths. 



In the absence of other structures, the number of the denti- 

 culations on the lower edge of the tarsal claws is of use in de- 

 termining the species of female specimens. 



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