( civ ) 



mark is either squarish with the posterior side curved and 

 rather shorter than the others, or else so much shorter and 

 so sharply curved that the mark becomes an isosceles triangle 

 with base directed forwards and with a rounded apex. The 

 squarest mark is seen in Meroglossa ? nigrifrons, although 

 here, too, the posterior side is strongly curved. Yellow 

 markings are also seen on the face, the chief resemblances 

 in this respect being between Euryglossa quadrimaculata and 

 Meroglossa ? nigrifrons, and betweeen Palaeorhiza nuhilosa, 

 Prosopis sp., and, less closely, Prosopis rotundiceps. Para- 

 colletes humerosus is a far-outlying member of this combina- 

 tion, being without the characteristic median mark, but 

 possessing on the mesonotum, in front of and within the 

 attachment of the forewings, a conspicuous elongated yellow 

 mark resembling in form the pair on the face of Prosopis sp., 

 and P. nuhilosa. 



Combination III bears a very characteristic Australian 

 pattern to which my attention was called some years ago by 

 Dr. R. C. L. Perkins (Proc. Ent. Soc, 1912, p. c). It is 

 probable that a very large number of species, including 

 members of other Aculeate groups, will be found to belong 

 to it. In the meantime Mr. Kelly's captures on Feb. 20 

 include six bees (without P. humerosus), so much alike that, 

 on a superficial inspection, they appear to belong to a single 

 species. The dominant species were Euryglossa quadri- 

 maculata (50 $) and Palaeorhiza nuhilosa (15 ?). Of the 

 remaining five species three were represented each by a single 

 example, the fourth by three, the fifth by six. 



Dr. R. C. L. Perkins has kindly supplied the following notes 

 on the species in Combination III. 



Paracolletes humerosus. The yellow markings are formed 

 by what I call " squamosity." Whether this consists of 

 modified hairs or excretion through the punctures I am not 

 quite sure. I do not think this belongs to the colour group : 

 it is too dissimilar, especially as other Paracolletes do un- 

 doubtedly belong to it. 



Euryglossa A-tnaculata. Although the " tubercles " are 

 black and do not enter into the colour-scheme at all, the 

 yellow lateral spots, being restricted to the down-curved 



