XIV. TACHYTES. 89 
ginal cell, and receiving both the recurrent nervures—the third 
lunulate ; the legs moderate, all spinose; the tarsi longer 
than the tibize, the anterior pair ciliated, the bifid claw having 
a large pulvillus within its fork. Aspomen ovato-lanceolate, 
subsessile, about the length of the thorax, with the superior 
surface depressed, and the apex acuminate in the 2, but fur- 
cate in the ¢ ; the podex in the ¢ with the disk flat, and the 
lateral margins reflexed, separated from the hypopygium by 
a horizontal incision, whence a cylindrical tube is exserted. 
Type, T. pompiliformis. 
4+} These insects were separated from Larra, under the 
name of Tachytes, by Panzer, in his ‘ Revision,” in 1806 ; 
Illiger did the same in his edition of the “‘ Fauna Etrusca,” 
in 1807, but called them “ Lyrops ;” Panzer’s name conse- 
quently has the precedence. I fully agree with Latreille in 
considering that there was scarcely occasion to disunite them, 
for they are closely linked by exotic species: the name is 
derived from the rapidity of their motions—rtay drys, quick- 
ness. 
Sp. 1. pomprtirormis. Panz. 
niger, abdominis basi rufo. 
length 23—4$ lines. 
V..d. Lind. Obs. pt. 2. p. 22. 5. 
Larra pompiliformis. Panz. 89.13 ; Spin. 2. 173. 
dimidiata. Panz, 106. 13. 
Black, finely punctured: head with a longitudinal impression 
extending from the base of the antenne to near the occiput; 
the interior margin of the eyes and the clypeus covered with 
an aurichalceous pubescence; the apex of the mandibles rufo- 
piceous. 
Thorax having the metathorax delicately granulated upon its 
superior surface, the truncation transversely striate, with a deep 
fossulet at the centre of its base; the tegule testaceous ; the 
