AUSTRALIAN THYNNIDEOUS INSECTS. 
107 
and one on each side. The abdomen is black and shining, the first 
segment with a large iri'egular yellow spot nearly divided in two 
by a black clavate line; each of the three following segments has 
two round yellow spots on the back and an oblong one on each side, 
as have also the fifth and sixth segments ; but in them they much 
diminish in size ; the five anterior segments on the under side are 
varied with yellow spots, which become gradually smaller beyond 
the 2nd joint. The legs are castaneous red, the coxre alone black, 
the posterior coxse with a yellow spot in front. The anal append¬ 
age terminates in an acute point, without any lateral spines. 
The female is dark chesnut red on the head and thorax, which 
are slightly and widely punctured and pilose, the punctures being 
larger and closer near the insertion of the antennm. The clypeus 
is irregular with a central point (fig. 4 Z»), the mandibles are pitchy 
and entire, the antennm pitchy, the legs chesnut red, the abdomen 
pitchy red, with five yellow fascise interrupted down the middle 
and at each side ; the intermediate segments on each side beneath 
have a small yellow spot. The first segment has a slight trans¬ 
verse carinated line near the extremity, the second segment with 
one near the base and another near the extremity, the inter¬ 
mediate space transversely multi-striolated; each of the following 
segments has a transverse carinated line nearly across the middle. 
The terminal segment of the abdomen is thick, truncate, with longi¬ 
tudinal striae, and a notch on each side beneath (fig. 4 e, 4/.) 
Figure 3 a, labnim ; 3 5, clypeus and mandible ; 3 c, maxilla; 3 d, labium ; 3 e and 3 
extremity of the abdomen, 3 mouth of another specimen with the trophiporrected; 
3 A, the labium as seen within the mouth j 3 i, the same seen beneath. 
Fig. 4 a, the labrum of the female; 4 the front of the head, with the trophi and mandibles 
seen from beneath ; 4 c, the maxillaj; 4 d, labium ; 4 ^, 4 /, terminal segment of abdo¬ 
men ; 4 middle segment of the abdomen, seen laterally, to show the position of the 
spiracle. 
THYNNUS (AGRIOMYIA) DEPRESSUS. /Fes/iv. 
(Plate 74- fig. 5 fig, 6 
^ T. niger nitidus punctatus griseo pilosus abdomine depresso oblongo-ovato, segmentis 2, 3, 
et 4to utrinque lunula tenui albida, pedibus anticis rufis, posticis 4 piceo-rufis femoribus 
uigricaotibus. 
Long. corp. lin. 7. Expans. alar. lin« 12, 
5 Capitc thoraco ct basi segmeuti Imi abdominis punctatissimis nigris; abdomine nitido 
punctato hujus segmento 2do et dimidio basali 3tii rufis, Antennis piceo-rufis, basi 
nigris pedibusque rufis. 
Long. corp. lin. d j*. 
Habitat, King George’s Sound, In Mus. Brit. 
The male is black, with gray hairs; head and thorax punctured 
