Wr,.: 195 



lungius, parum nitidnm, segmento l'"" cceteris omnino simlli ; gegmentis 

 omnibus post ice exalhido suhtiliter marginatce. Fedes postici incrassati. 



This species, liaviug no transverse impressions ontlie anterior ab- 

 dominal segments, no areolet of the wings, and the metathorax dis- 

 tinctly areated, is to be referred to Holmgren's Sect. II, A, a, a. It 

 can only be confounded with B.pecforaforius, Gr., but diKers in having 

 the pleur® black, the metathorax areated, &c. The name perouaf us is 

 meant to express the booted appearance of the hind legs. Bred by 

 Mr. Cameron from the larvae of JVemafus cadderensis ; see p. 127 of 

 this volume. 



Among the insects sent to me by this acute and indefatigable 

 investigator of the economy of saw-flies, it is worthy of remark that 

 two specimens of Eumesius crassicornis, Gr. ((j^ ?), occur, a rarity 

 unnoticed here, I believe, since the time of Curtis. 



An external parasite on the larva? of Ncmatus viminalis, L., which 

 Mr. Cameron sends for identification, is Ichneutes reunitor, Nees, var. 

 hrevis, Wesm. The specimens before me are only one-third of the 

 size of the typical reunitor, with darker legs and palpi, the metathorax 

 with one elongate sub-triangular area, the radial nerve straight, and 

 the smooth space on the pleurae rather larger. Notwithstanding these 

 differences, "Wesmael was of opinion that his hreois was not specifically 

 distinct from the reunitor of Nees (see Nouv. Mem. Ac. Brux., 1838, 

 p. 15G). I suspect that this opinion is erroneous, but further obser- 

 vations alone can settle the question. Mr. Cameron informs me that 

 he has reared the typical reunitor from the larva) of Cladius p>adi, L. 

 It is noteworthy, as to the distribution of these parasites, that speci- 

 mens of the var. hrevis, Wesm., were brought from AVide Bay, Spitz- 

 bergen, by the Rev. A. E. Eaton. 



Lastiugham, Picktriiif^: 



December Iblh, 1875. 



.NOTES ON SOME BRITISn DOLIcnOPODTD.E, WITH DESC'RirilONS 

 OE XKW SrECIES. 



BY U. II. V Kit HALL. 



fcoulinued from jinge 118.) 



PonrilYROI'H SIMPLEX, sp. n. 



<J ?. JI'jUcus, nitidu.i, facie aJbidd; al ulisflavido-alhidi.s, alhido-cilittti;; ; 

 pedihus flavldis, coxis nigris, feworihus anieriorihus aut vigris (<J), aut 

 obscuris C^) apice flavidis, posticis apicc nigris {S) aut obscuris C^), iibiis 

 modicc sedgeris ; alts cinereo-hgalinis. Long. 2 liii. 



