ENTOMOLOGY HYMENOPTE11A. 369 



nally illustrated the Australian forms iu this family, as well by figuring new 

 species, and in several instances both sexes, as by the new genera lie has 

 established. The author declines giving an opinion at present whether all 

 the genera introduced by Gueriu ought to stand. Of Thynnus proper he has 

 figured lit/ nl hiatus $ (pi. 74, f. 3, 4), from Van Diemen's Land ; brownii 

 (pi. 76, ]), King George's Sound; picipes (77, 2), do. ; leachiellus 

 (interruptus, 77, 1) ? (S3, 4), New South Wales ; trochanlericus 

 (77, 3), King George's Sound; tuberetdiventris $ (76, 2), do.; shuckardi, 

 Guer. (83, 5), New South Wales ; Klugii (82, 1), Swan River; gra- 

 vidus $ (82, 3), New Holland. 



Under Agriomyia, Guer., he brings Th. depressus $ $ (74, 5, G), from 

 King George's Soimd ; odyneroides 9 (75, 3, 4), melleus (76, 4), do. ; 

 trifidus (77,4), and niarginalis (76, 3), do. Under Thynnoides, Guer., 

 Th. fumipetmis, $ (75, 1, 2), from Port Philip ; obscimts, KL, $ (82, 2); 

 gracilis (S3, 2, 3), Adelaide. Here should be placed also Th. purpu- 

 I'ipouiis (S3, 1), from New Holland, and dimidiatus (76, 5). 



The author refers to genus Aelurus, Kl , the Agriomyia abdominalis of 

 Giu'rin (pi. 77, p. 5), which is identical with Th. fervidus, Er., and unques- 

 tionably ought to constitute a new genus or subgenus, as it is perfectly dis- 

 tinct from the South American genus Aelurus. 



All these various forms agree very closely as regards the female sex, so 

 far as this is known, both in the structure of the body generally, and in the 

 circumstance that the palps are always much abbreviated, and commonly 

 also the number of the joints reduced (according to the author's researches, 

 even so low as three for the jaw, two for the lip-pair), without any constant 

 relation that can be established, in the present state of our knowledge, 

 between these numerical differences in the females of the various species, and 

 the characteristics of their males. Thus Westwood has figured Th. lii/uli- 

 natus $ with three joints and four, in the jaw and lip-palps respectively ; Th. 

 leachiellus and shuckardi, 2, 3 ; Thynnoides obscurus, 2, 3 ; Thynnoidesfumi- 

 pennis, 3, 3, the last joint very small; Agriomyia odyneroides, 2, 4; Tlii/nnus 

 f/racidus, 6, 4 ; these last the normal numbers, only the last joint of the 

 lip-pair is very small, and the last three of the jaw-pair abbreviated. 



Westwood regards Rhagigaster, Guer., as a distinct genus. The males 

 are distinguished from the rest of the Thynni by their cylindric abdomen, in 

 wluch respect they come near Myziue. The females differ from them more 

 notably, they are elongated and smooth, have their upper jaws two-toothed 

 at the point, their palps as well developed as in the other sex, the jaw-pair 

 with six, the lip-pair with four, joints. The species he enumerates are, 1. Eh. 

 unicolor, Guer., ^ 2. ephippiger (Diammct, id. Guer.), which Shuckard con- 

 siders as ^ of the preceding. 3. mandibularis, Westw., ? (pi. 74, f. 

 1, 2), from Port Philip. 4. morio, Westw., < . 5. htemorrhoidalis, Guer., 



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