1 May, 1899.] QUEENSLAND AGRICULTURAL JOURNAL. 891 
(A. Labium or hypostome with 10 rows of teeth:—R. caudatus 
| (Neumn.) 
9 4 B. Uno hypostome with 8 rows of teeth :—R. annulatus and 
: australis. 
| C. Labium or hypostome with 6 rows of teeth:—R. evertsi and 
L decoloratus. 
(This feature separates caudatus from the four remaining species, and 
helps to separate annulatus and australis from evertsi and decoloratus.) 
1. Diagram of the labium of R. annulatus and R. australis. 2. The same of R. decoloratus 
and R. evertsi (original). 
(A. Mandibles with lesser process, bi-cuspid:—R. annulatus. 
| B. Mandibles with lesser process, tri-cuspid (Neum.):—2. evertst. 
3 J C. Mandibles with lesser process, bi-cuspid, and presenting a 
: | rounded projection as well:—2&, decoloratus. 4 
; D. Mandibles with the lesser process, tri-cuspid, and presenting 
L a rounded projection as well:—2. australis. 
(This feature differs in each species; there is a slight similarity between 
annulatus and decoloratus and evertst and australis.) 
3 5 
Diagrams of Mandibles.—1. Of R. annulatus, A the lesser and B the greater process. 2. OF 
4 
R. annulatus, showing that the lesser process is bi-cuspid. 38. R. decoloratus. 
b. Of R, evertsi. (1 and 5 after Neumann; 2, 3, and 4 original.) 
Neumann ; 2, 3, and 4: original.) 
A. Male with the shield extending to thé posterior margin :—Z. 
annulatus, caudatus, decoloratus, australis. ‘ ; 
4.4 8. Male with the shield not extending to the posterior margin 
(Neumn.) :—2&. everts?. ; 
(This appears to be a ready feature for distinguishing * evertsi from 
decoloratus.) : 
A. Maie with a distinct horny “ tail” :—2. caudatus, decoloratus, 
and australis. ‘a: ie 
5.) B. Male with a small caudal protuberance :—R. evertsi. 
C. Male with no indication of a “ tail’ :—2. annulatus. 
(The absence of a tail to the male of annulatus readily separates it from the 
| other species.) 
. . 
4, Of R. australis. 
be, 
