on 
420 Mr^iovvland E. Turner 
truncate at the apex. Tarsal ungues with two teeth near the 
base. 
Black; the fifth and sixth abdominal segments and the base and 
apex of the fourth bright chestnut brown. Wings fulvo-hyaline, 
broadly fusco-hyaline at the apex, nervures fuscous. Length 23 mm. 
Hah. Queensland, Cairns. 
This species closely resembles Zaspilothynnus excavatus, 
Turn., in size and colour. It is closely allied to Sphex 
confrater, Kohl., from New Britain, but the shape of the 
clypeus is different. As far as I know no Thynnus of 
similar colouring occurs in New Britain, nor is the plan 
of colouring one that is at all prevalent among Queensland 
Hymenoptera. The present species must be a rarity as 
I have never seen another specimen. Z. eoxavatus is a 
fairly commcn insect in the tropical scrubs of the Cairns 
district, and also occurs at Cooktown. ' 
Key to the Australian Species of 
THE Genus Cerceris. 
? ? 
A. Clypeus with a prominent lamina 
projecting from near the base. 
a. The lamina arched, much longer than 
broad. Orange, me.sonotum and 
fourth abdominal segment black . G. aurantiaca, Sm. 
b. The lamina short. Black with yellow 
marks on front and thorax, second, 
fourth and fifth segments of abdo¬ 
men with narrow yellow apical 
bands. C. opposita, Sm. 
B. Clypeus without a lamina. 
a. Triangular space at the base of the 
medium segment smooth and shin¬ 
ing. 
a^. Clypeus with a small tubercle on 
each side near the middle, de¬ 
pressed from the middle to the 
apex. 
a-^ Reddish orange; vertex, nieso- 
thorax, third and fourth abdo¬ 
minal segments black . . . C. victrix, Turn, 
b’*. Black ; three apical segments of 
abdomen more or less cas- 
taneous 
G. perkinsi, Turn, 
