OF INSECTS. 
331 
ACANTHOMERA IMMANIS. 
Plate XXXV. Fig. 2. 
This represents one of the most gigantic Dipterous 
insects hitherto discovered, and which appears to he 
the Acanthomera Immanis of Weidemann, (Auss. 
Zweifl. Ins. 2. app. p. 623,) although the description 
of the author is very incomplete, the only specimen 
which he had seen being in a very mutilated state. 
The specimen here figured is nearly two inches long 
and three inches in the expanse of the wings. It 
is a female, which sex differs from the males in 
the simple posterior femora, thus shewing the im- 
propriety of the generic name which is derived from 
the toothed posterior thighs of the males alone, 
(which only were known to Weidemann when he 
established the genus.) The minute silvery dots, 
arranged in curved series on the second, third, and 
fourth abdominal segments, are very peculiar. The 
specimen here figured is in the collection of the 
Entomological Club and was presented by G. S. 
Bowerbank, Esq. It is from Brazil. 
We have now completed our proposed review of 
all the orders of the Ptilota or winged insects. The 
three last orders indicated in the synoptical table, 
(page 200) include such genera as Pulex, Lepisma, 
Pediculus, Ricinus, and a few others of a similar 
nature, the general history of which forms a some- 
what distinct department of the subject, not of very 
general interest, and which it is no part of our 
plan to enter into at present. 
