494? Cynipidcous Parasite upon the Rose Louse. 



the female parasites similarly employed; but have not yet 

 traced the developement of the insects to the perfect state. 



As it cannot be doubted that diversity of habits necessarily 

 implies diversity of structure (the reverse of the proposition 

 being equally tenable), I carefully examined this fly, which 

 proves to be a nondescript ; and, independent of the necessary 

 variation in internal organisation, its antennas, wings, &c, 

 differ from those of the type of the genus Cynips : and hence, 

 in conjunction with its habits, I form it into a distinct genus 

 or subgenus, under the name of 



Allo'tria * Westw. Thorax ovatus ; scutello elevato, basi transverse 

 depresso ; abdomen thorace minus, late ovatum ; antennae P. corpore 

 longiores, filiformes, 13-articulatae ; alas magnae, cellula costali 1, basali 



* Allotria, estranged; from its habits being at variance with those of the 

 rest of the family. The following sketch of the family Cynfpidae may not 

 be deemed useless : — 



Antennae <? 15- Q 13-articulatae IbaYia - 1. 



n u , K ("magnas, areola submarginali parva trigona di- 



»J£ \l? ai^-S stincta - - - Cy"Ws . 2. 



articulate Ala £ obsoIeta , _ . . . V. G. Steph - 3. 



i, at nervo, versus alaa basin extenso, 

 jrato - - FiG^ra 



f breves fsensira incrassataa - Eucoi'la 



9 13- <$ 14- 15- f triangularis, at nervo, versus alaa basin extenso, 



fere obliterato - - Figi^tes 



Areola 2da I S™ | apice -J 

 submarginalis J 5'""; J crassiores C artic. Suit, maximis - Kleido'toma 6. 

 AUieim ^ v llongsfili.rpedunculatum - Ana'charis 7. 



| formes. < 

 (.Abdomen C. subsessile • - Allo'tria 8. 



1. Ibalia (Lafr.) Sagaris Pz. ; 1 species, i?anchus cultellator Fab. — 

 2. Cynips Lin. ; between thirty and forty British species. Cynips quercus 

 folii Lin., &c. The nerves enclosing the small submarginal cell are of 

 equal thickness. — 3. G. N. Steph. Cat. Cynips aptera Fab. Coquebert. — 

 4. Figites Latr. Antennae of the males long, filiform, and 14-jointed ; of the 

 females shorter, and gradually thickened to the tips ; the scutellum large, 

 with two basal excavations, and obtuse at the tip. Fig. scutellaris Rossi, 

 Latr.y&c. — 5. Eucoila Westw. Antennae of the males 15-jointed; scutellum 

 with three excavations; the basal joint of the abdomen is very short, and 

 clothed with white pile at the tip. Jurine has confounded this and the pre- 

 ceding under the name of Figites : several species, including Eucoila cras- 

 sinerva Westw. Nigra nitida ; antennis piceis ; pedibus anoque castaneis ; 

 femoribus obscurioribus ; nervis alarum crassissimis fuscis. Long. 1| — 

 2 lin. ; Ensham. — 6. Kleidotoma Westw. Scutellum at the base with a 

 broad excavation ; with the apex tubercular and 1-excavated : several spe- 

 cies, including Kl. psiloides Westw. Nigra nitida ; antennis fusco-nigris ; 

 pedibus castaneis ; femoribus piceis ; nervis tenuibus. Long, § lin. ; Ens- 

 ham. — 7. Anacharis Dolman. Antennae in the males 14-jointed; scu- 

 tellum with two rudimental excavations. Divisible into two sections. 

 a, Abdominal peduncle one third of the length of the abdomen. Sp. 1. An. 

 eucharoides Dalm. £ P . b, Peduncle not more than one fifth of the 

 length of the abdomen. Sp. 2. An. rufipes Westw. Nigra; antennis con- 

 coloribus ; subtus in P. pallidioribus; pedibus testaceis ; tarsis fuscis ; alis 

 pallidis; nervis fuscis. g P. • Long, li lin. Sp. 3. An. fumipennis Westw. 

 Nigra; antennis piceis; alis fumeis ; nervis nigris ; pedibus fulvo-piceis ; 

 tarsis obscuris. Long. 1 lin. — 8. Allotria Westw., described above. I do 

 not know the Cynips ediogaster of Panzer, which Mr. Haliday has formed 

 into the genus Onychia. 



