XXV. PASSALGCUS. 189 
longicorn beetles ; he consequently has the priority, and my 
original name must necessarily be changed ; it may there- 
fore stand as Passalecus, which has nearly the same sig- 
nification, viz. racoudos, a stake or paling, and dixos, a house, 
from their burrowing in palings, &c. Mr. Curtis included 
two of these insects in his genus Diodontus, and the obser- 
vations under that genus and under Pemphredon may be 
referred to, in explanation of my reasons for having still 
further subdivided them. 
Sp.1. rnsienis. .V. d. Lind. 
ater, mandibulis palpisque flavis, corniculo inter antennas obso- 
leto 9 ; porrecto é. 
length 23—3 lines. 
Pemphredon insignis. YV.d. Lind. pt. 2.79.3. 9 only. 
Diodontus insignis. Curtis's Brit. Ent. folio 497. 
Head black, thickly punctured; an impressed longitudinal 
line extending from the anterior stemma to the middle of the 
face; the clypeus transverse, convex, marginate in front, and 
obsoletely tridentate; the labrum triangular; antenne black, 
with the scape beneath cream-coloured ; the mandibles cream- 
coloured, with their apex ferruginous and tridentate; the palpi 
yellow, except the outside of their basal joints. 
Thorax black, delicately punctured, shining; the epaulets of 
the tegulz consute, a longitudinal scratch on each side parallel 
with the middle of the epaulet, and a longitudinal deep impres- 
sion on each side within the scratches, extending from the base 
of the dorsolum to its disk, where it gradually becomes obso- 
lete ; the scutellum delicately punctured; the metathorax very 
rugose and obtusely truncate at its extremity; the tubercles 
white ; the tegulz testaceous, with their margins black; the 
wings iridescent, the stigma large, the nervures piceous; the 
legs black, with the articulations of the femora, their apex, and 
entire tibiz and tarsi, ferruginous. 
