AUSTRALIAN THYNNIDEOUS INSECTS. 109 
the head is black, with the clypeus convex, its extremity emar- 
ginate-triincate, yellow, which colour does not quite extend upwards 
to the insertion of the anteniife; it also forms a short branch on 
each side, which does not, however, quite reach the eyes, Down 
the middle runs a dark mark, which is dilated in the middle into 
an oval ring, and on each side is a dark spot. The mandibles are 
yellow, with the tips black; the antennee and thorax are black and 
without spots, as is also the abdomen; the latter has also the inter¬ 
mediate segments constricted across near the base and apex, and 
margined with slender luteous hairs ; it terminates in a flattened 
point, which is slightly emarginate on each side near the extremity, 
and accompanied on each side near the base by a short spur. The 
wings are smoky yellowish, and the legs pitchy red. The female is 
black, with the exception of the head, antennse, and legs, which are 
fulvous red. The abdomen is very large and gibbose; the first 
segment has a transverse carinated line near its extremity, the 
second segment has a carinated line across near the base, and 
another near the extremity, the intervening space with about three 
elevated finer carinated lines; the third segment has a transverse 
impressed line, at a short distance from the base, the intervening 
space being excessively minutely and closely punctured, and with 
another impressed line, which runs close to the apical margin in 
the middle, but at the sides obliquely extends into the disc of the 
segment. The fourth segment has a similar line near the apex, 
but none at the base. 
Fig. 1 fl, represents the clypeus and mandibles of the male; 1 b, the maxilla; 1 e, the labium ; 
1 df the labrum ; 1 e, the extremity of the body. 
Fig. 2, the front of the head of the female; 2 the maxilla, with the very minute palpus 6 * 
2 c, the labium, with the very minute labial palpus c*; 2d and 2 e, the dejiexed 
entire striolated extremity of the body. 
THYNNUS (AGRIOMYIA) ODYNEROIDES, Westw. 
(Plate 75, fig. 3, $ fig. 4. $ ) 
$ Niger flavo-varius pronoto carina antica flava metathoraee immaculate ; pedibus fulvo* 
rubs, alls limpidis stigmate rufo. Long corp. lin. 7. Expans. alar. lin. 12. 
^ fulvo-rufescens thorace, abdominis basi fasciaque lata mediana nigris. Long. corp. lin. 4, 
This species is closely allied to Agriomyia maculata. Gu^r., but 
differs in several respects. The head and thorax are black, and 
very closely and finely punctured; the clypeus is narrowly produced 
and truncated ; it is yellow, with a black transverse mark, and 
