AUSTRALIAN THYNNIDEOUS INSECTS. 103 
Thynnus Shuckardi, and flavilabris, from New Holland. 
Thynnoides nigripes, from Swan River. 
He likewise adds the descriptions of two new Australian genera. 
Catocheilus, Guér., allied to Thynnus and Agriomyia, but having a membranaceous con- 
cealed labrum, and the terminal joint of the maxillary palpi very minute, and the 
maxill much ciliated within. C. Klugii, Guér., ¢ 9. (Swan River.) 
Lophocheilus, Guér.—Allied to Thynnoides, but having the labrum truncated and villose 
in front, slightly prominent and emarginate, the maxille slightly hairy, short; lower lip 
short, with the paraglossee folded back. 3 Species: L. villosus, L. distinctus, and L. ? 
collaris,—all from New Holland. 
Such, with the addition of the genera— 
Psamatha Shuckard, mentioned above, 
Oncorhinus, Shk., in Gray’s Australia Append., Vol. ii., founded upon a fine species from 
Swan River, and 
Amblysoma, Westw. in Guér. Mag. de Zool., founded upon a Brazilian species, and the 
figure of Anodotyra tricolor, W. published in the same work, constitute the whole of 
the generic groups hitherto proposed in the sub-family. 
Dr. Klug, rejecting all these generic names, in his Mono- 
graph on the genus, recently published in the ‘ Transactions of the 
Berlin Academy,” and uniting the whole under the generic name of 
Thynnus, has divided the Australian species into three sections, 
A. Th. dentatus, &c. 
B. (Agriomyia, Guér.) 
C. (Rhagigaster, Thynnoides, and Anthobosca, Guér.) ; 
describing two new Australian species of the section B. (T. varie- 
gatus and pulchellus), and also two new species of the section C. 
(T. obseurus, and labiatus, K1.) 
At present it is premature to decide upon the propriety of the 
rejecting of all these generic groups, although I cannot but think 
that some of them rest upon characters which will be found to be 
of too trivial an importance, especially when the general and 
greatly variable habit of the species is considered ; the apparent 
differences in the formations of the divisions of the lower lip is 
certainly not to be depended upon in our dried specimens, since in 
some individuals of a species they are retracted,in others porrected.* 
The dissections which I now, however, offer to the student, 
in connection with those in the 54th plate, enables us to estimate 
the value of one of M. Guerin’s genera, namely Ruacicasrer, whilst 
at the same time it will serve to show that the females of the 
Myzine, when discovered, will almost certainly be apterous; the 
* Compare pl. 74, fig. 3d. « 
