HYMENOPTERA. — UROCERIDE. 115 

upper lip is minute and elongated; the mandibles short, but very 
strong and horny; the lower parts of the mouth vary considerably in 
their form. In Urocerus they are very anomalous and minute; the 
maxillz are two elongated setose lobes, united by membrane at the 
base, with very short exarticulate (biarticulate ? Curtis, and in Klug’s 
Monogr. sectioni. tab. 8. fig. 18. from S. gigas) palpi (fig.72. 10. 
from S. juvencus g ). ‘The lower lip in this genus is attached upon 
the membrane connecting the base of the maxilla (fig. 72.11.) ; the 
mentum is transverse, and broadest in front; the labium is produced 
between the palpi, which are short and 3-jointed in S. juvencus, whilst 
they are 2- or 4-jointed in other species, according to Klug, who, 
however, as Latreille justly observes, did not understand the peculiar 
construction of these organs, judging, at least, from the figures given 
in his Monogr. Siricum. Latreille, indeed, states that he regards the 
maxillary palpi as 2-jointed and the labial as 3-jointed in all the spe- 
cies. (Gen. Cr., &c., tom. iil, p. 240. note.) The anterior tibiz are 
furnished with a single spur at the tip ( fig. 72. 12.), and the males 
have the hind legs flattened. The prothorax is elongated beneath 
into ashort neck, the collar being broad and elevated; the mesothorax 
is large, and the metathorax composed of two distinct dorgal parts, 
the anterior of which is furnished with two cenchri, and the posterior 

joints being closely soldered together; in U. juveneus g they are 18- and in the 
Q 19-jointed. I possess males of the latter species in whichs they are 19-jointed, 
and others in which they are only 17-jointed. Liatreille places U. gigas in the 
section with 25-jointed antenna, and U. juvencus in that with 21- to 23-jointed 
antenne, (See further hereon, Kirby, Mon. dp. Angl., yol.i. p. 219.) 
IZ 
