( cvi ) 



(" IV. Yell. &f?.," in list). There is great variability in the 

 amount of yellow on other parts. This association includes 

 various different patterns, probably forming large separate 

 combinations, here brought together for the sake of con- 

 venience. Thus the <S Thynnid Agriomyia variegata, of which 

 281 were taken on Feb. 20, is obviously resembled by the bee 

 Eiiryglossa calliopsella (11 $), while Euryglossa flavopicta and 

 E. microxantha differ in the much greater development of 

 yellow on head and thorax and the replacement of black by a 

 brownish shade on the abdomen. In the other male Thynnids 

 belonging to Combination IV there is an almost complete 

 disappearance of yellow from head and thorax, and the ab- 

 dominal bands are very pale yellow, extremely narrow and 

 interrupted, so that the insects at a little distance would appear 

 to fall into the all-black Combination I. 



Combination V. Black with two broad abdominal bands of 

 dark orange ('' V. Or. bd.,^' in list). This, like III, is a very 

 characteristic and highly developed Australian combina- 

 tion. The central models are probably to be found in the 

 Eumenidae (Diploptera), while convergent patterns are seen 

 not only in other Aculeates but also in Diptera (Asilidae) 

 and Coleoptera (Longicorns and Buprestidae). Some of 

 these members of the Combination are represented in Linn. 

 Soc. Journ.-Zool., 1898, vol. xxvi, pi. 41, figs. 5, 5a, 5b, 

 5c (see also pages 587, 588). Of the two members captured 

 on Feb. 20, the bee Hylaeoides concinna was common (4 <S 

 17 ?), while the Fossor Crabro sp. nr. neglectus was represented 

 by a single female. Both species are much darker than 

 the ones figured in Linn. Soc. Journ., the thorax and head, 

 as looked at from above, being almost entirely black, and the 

 orange bands, narrower in the Crabro, of a peculiarly deep 

 shade. 



The following note on Combination V has been kindly 

 contributed by Mr. Rowland E. Turner : — 



Fam. Crabronidae. Crabro (Solenius) tridentatus, Sm., from 

 S.E. Australia has the broad orange band pattern, whereas 

 C. tasmanicus, Sm., from Tasmania, which does not differ 

 appreciably in structure, has narrow yellow bands. The only 

 representatives of the orange pattern in Tasmania appear to 



