20 
MUTILLJ5 OP NEW HOLLAND, 
induced to add a figure of it, and of Diamma cserulsea, to my 
representations of Australian ilutillse. 
As the genus Psamatha has been described at some length in the 
work above referred to, it will bo necessary only that I should 
notice some peculiarities omitted bj'^ Mr. Shuckard; these relate 
especially to the structure of the mouth. The clypeus (plate 54, 
fig. 5 a) is carinated down the middle, being produced in a trans¬ 
verse lobe over the labrum, of which the anterior ciliated margin 
is almost hidden. The mandibles are much curved, and terminate 
in three acute teeth, the apical one being the largest. In the male 
3Iu(m(S the mandibles are simply bifid ; the same is also the case 
with the majority of the T/iynni. The Chilian Telephoromyia Gu6r. 
and the Kangaroo Island Taclnjpterus drier, however, the man¬ 
dibles bidentato within. The maxillm (fig. 5 V) in Psamatha do not 
materially differ from the general form of these organs amongst the 
fossorial species, with 6-jointed maxillary palpi; the labium (fig. 5 c) 
in my specimen is considerably exserted and emarginate at the tip, 
arising from a very narrow carinated mentum, slender in front, and 
with 4-jointed labial palpi. The ungues in all the feet are bifid, 
(fig. 5 d), in w'hich respect the insect agrees with the Thynni, and 
differs from the Mutillm. The eyes are but very slightly emargi¬ 
nate on the inside, wdiereas they'” have a deep notch in the male 
Mutillm. The veins of the wings extend quite to the apical margin 
as in the Thynni, whereas in the Mutillse they stop at some distance 
from the margin. And lastly, the w-ant of colour in these organs, 
as in this insect, occurs in the Thynni more ordinarily than in the 
Mutillm. The extremity of the abdomen (fig. 5 e) is incorrectly 
described by Mr. Shuckard, as it has only one valve on each side 
projecting beyond it (in my specimen being coloured whitish) 
forming the quadrant of a circle, and externally fringed; the 
apical ventral plate is truncate at its extremity, and not produced 
into a spine as in many Thynni, nor bidentate as in the male 
Mutillae. 
Species I .—Psamaiha chalyhea, Shuckard. (Plate 64, fig. 5.) Clialybea nitida griseo- 
pubescens, margine postico prothoracis albido, abdomine atro utrinque maculis quatuor 
albidis, pedibus rufis basi ingris, tarsis piceis. Long. corj). lin. 6 — 65 . Expans. alar. lin. 
llh 
Habitat in Terra Van Biemenii. Mus. Soc. Ent. Lond. Saunders, Shuckard, et Westw. 
I am indebted to AV. AV. Saunders, Esq., for this interesting 
species. 
