XXXIV. CERCERIS. Zoo 
the second obtuse, and placed half-way within, and the third 
more acute, and nearer the base. THorax ovate; the collar 
transverse, as also the scutellum; the metathorax obtusely 
truncated, having a triangular enclosure at its base; the su- 
perior wings with one marginal cell oblong, rounded at its apex, 
and three submarginal cells, the first very long, the second tri- 
angular and petiolated, receiving the first recurrent nervure in 
its centre, the third distant from the apex of the wing, receiving 
near its commencement the second recurrent nervure ; the legs 
moderately long, very stout, and spinose; the anterior tarsi 
ciliated on the exterior. The aspomen oblong, the first seg- 
ment narrowed into half the width of the rest, the base and 
margins of all crenate; the apical segment with a pair of 
carinze, concave between on each side, the surface between 
the inner ones plane, and either truncated or furcate at its 
extremity. 
Type, C. Arenaria. Lin. 
+414 The derivation of the name is uncertain. The genus 
was established by Latreille in his ‘ Histoire,’ where he 
separated them from the Philanthus of Fabricius. Jurine, 
from mistaking the type of the latter author, applied the 
name of Philanthus to these insects. Their synonymy 
appears very much confused. 
Sp. 1. arenaArRiA. Lin. 
niger, abdominis fascius quatuor (g quinque) flavis, primo seg- 
mento duobus punctis flavis, tibus ferrugineis. 
length 44—72 lines. 
V. d. Lind. Pt. 2.109. 3. 
Sphex arenaria. Lin. F. 8. 1660; S. N. 1. 946. 31. 9 ; Villers, 3. 
235. 38. 
Crabro arenarius. Fab. Mant. 1. 297. 20; Schr. F. B. 2. 335, 2184; 
Oliy. Ency. Méth. 6.516. 22. 9. 
Philanthus letus. Panz. F. G. 63. 11. 
Cerceris aurita? Fab. E. S. Supp. 268.1; Piez. 301. 2.9; Latr. Hist. 
Nat. 13. 315.1; Spin. 1. 96.1. 9 ; Latr. Nouv. Dict. ed. 2. 512. 
