The Rev. Wm. KIRBY on a new Order of Insects. — 115 
terminatum*, subtus stylo longiusculo lineari reflexo, 
basi dilatato ; apice, ut videtur, fisso--? ano carnoso. 
Larva in Vespidarum corpore parasitica, lanceolata, plicata, car- 
nosa: capite variabili ? compresso]. 
Pupa linearis carnosa intra abdomen Vespe refocillata ; capite ex- 
serto corneo ; oculorum operculis fenestratis: fenestrulis hexa- 
gonis§. 
Metamorphosis preecedentis. 
Professor Peck considered the two insects from which I have 
formed these genera, merely as species of the same genus ; but, 
not to mention the considerable diminution of the number of 
the hexagonal lenses in the eyes of Xenos and the much greater 
elevation and thickness of the septa which separate them, nor 
the cleft terminal joint of the tarsi in Stylops, or the abdomen 
fleshy in the latter and corneous in the former, besides other dis- 
crepancies of less importance, the very remarkable differences 
observable in the structure of their antenne will, I think, fully 
warrant their separation. The singular fenestrated eye-covers, 
also, which form so very peculiar a character of the pupa of 
Xenos, and which are not to be found in that of Stylops, furnish 
another and very decisive argument for considering these insects 
as belonging to different genera. 
Before I describe the insect I received from America, I shall 
ive the diagnostic characters of Rossi's X. Vesparum, selected 
from those’he has detailed in the work above alluded to, which 
will enable entomologists more easily to compare the two species 
together. I hope I shall stand excused for altering the trivial 
names by which both he and Professor Peck have distinguished 
their insects, since, as both are parasites of Vespe, the pH 
* Tas. IX. fig. 15. a. + Ibid.b. + Tas. VIIL fg. 1.3.4. § fig. 7. aa. fig. 8. a. 
Q2 names 
