XXXIII. MIMESA. 229 
and quadrate; the legs short. The ABDOMEN ellipsoid, pe- 
tiolated, the apex in the ¢ armed with an upcurved spine. 
Type, P. equestris. F. 
+4+ Although these insects exactly agree with the pre- 
ceding in habit, yet from the neuration of the wings being 
different, I necessarily separate them as a new genus. 
The name is derived from piuyois, imitation, in allusion to 
their resemblance to their recent congeners. 
Sp. 1. kEquestris. Fab. 
ater, abdominis segmento primo secundoque rufo, petiolo tere- 
tiusculo supra rugoso. 
length 34—43 lines. 
Psen equestris. V.d. Lind. pt. 2.107. 4; Latr. Nouv. Dict. ed. 2. 28. 
193 ; Curt. Brit. Ent. vol. i. pl. 25. 
Trypoxylon equestre. Fab. Piez. 182. 6. 
Psen rufa. Panz. 96. 17. 
Head black, pubescent, punctured; the face covered with 
silvery down; the antenne black,—yellow, piceous, or fulvous 
beneath, and at their apex; the mandibles piceous at their 
apex; the anterior margin of the clypeus slightly reflexed. 
Thorax black, punctured, having two longitudinal impressions 
at the base of the dorsolum, which extend to the disc; the 
metathorax rugose, with a triangular enclosure at its base, the 
base of which is longitudinally striate; the tegule testaceous ; 
the wings hyaline, iridescent, the nervures black ; the legs black, 
with the apex of the tarsi ferruginous, the anterior tarsi cili- 
ated on the outside, and the intermediate and posterior tibiz 
spinose. 
The abdomen having its petiole wider at its extremity than at 
its base, plane above, or irregularly concave and rugose, some- 
what shorter than the remainder of the segment, black, the re- 
mainder of the first segment and the entire second red, the 
rest black, the hypopygium slightly produced, and the podex 
covered with fuscous pubescence ?. 
