4 The Cane Grubs of Australia. 
Size medium large; peritremes flattened, very open, decreasing in size caudad, 
very small on last three abdominal segments ; epicranium large, smooth, 
polished, with a very few scattered pin-punctures ; left mandible with five 
acute teeth, the right with four; lobes of thoracic and abdominal segments 
not well defined ; anal orifice consisting of a longitudinal cleft, on either side 
with a raised oval lobe; apex ventrad with an oblique area on either side, 
of dense setae; antenneze 4-jointed, the second and third joints long, the 
fourth very small; latero-cervical shield consisting of an elongate, transverse 
area far above the thoracic peritreme Sc 36 a 56) = INOS BEE 
Body widest at base of apical abdominal segment ; caudal legs longer than eithet 
first or second; thoracic peritreme open along caudal margin; mandibles 
curved, the penicellus present; lacinia and galea not distinctly separated ; 
spiracles closed me ee ahs ne Lis fe aan so =k 
(3) Body short and stout, the head much narrower, not conspicuous, partly retracted ; 
legs small ; antenna 4-jointed es os Sos a as = (i). 
Body not short and stout, the head not much narrower, conspicuous, not retracted ; 
legs not small a6 an % ae es — a ee = (5): 
(4) Venter of abdomen at apex with a naked elliptical central space, without special 
delimiting setz ; size medium .. 5.0 56 -- = Cacachroa decorticata. 
Venter of abdomen at apex with a narrow elliptical path, open caudad, and bounded 
on either side by a row of about fourteen short, stout, black sete; size 
medium-small 5% 66 56 30 ie .. = Cetonid sp. No. 46. 
(5) Antenne apparently only 3-jointed; apex of antennae with numerous long 
seattered seta. 
Size small ; apical abdominal segment ventrad without scattered sete, but with a 
long, oblique row of very clo:e, short, stout sete running almost entire length 
of segment and approaching each other caudad ; anal orifice straight ; epi- 
cranium practically smooth ; left mandible with two small acute inner teeth, 
the right with one, no small tooth near the retinaculum ; seccnd and third 
antennal joints long, the appendix long, half as Jong as joint 3 but not pro- 
jecting beyond apex of the joint 26 re 36 -. =No. 539. 
Anteanez plainly 4-jointed ; apex of antennae without distinct sete ac = (6). 
(6) Anal orifice forming a transverse cleft, somewhat distant from the apex and on the 
dorsum of the abdomen, the abdomen squarely truncate at apex. 
Size small; head smooth; apex of abdomen ventrad smooth, with a tran=ver=e 
line of short fine sete; anal orifice straight; second antennal joint as long 
as other three united ; epicranial sclerite with about two sets on either side 
of meson in centre, the sclerite otherwise naked .. Sie a — NO-o0mn 
Anal orifice not impressed, situated at extreme caudad, the apex pointed = (7). 
(7) Anal orifice forming a straight, or nearly straight, transverse slit, without a channe. 
joining it at meson from venter ; head sometimes punctate or wrinkled ; size 
medium to very large, never small; apex of abdomen ventrad with or without a 
definite formation of sete Bis Ae a Fe) Se 2% = (Cc 
Anal orifice triangular, the apex caudad, with a median channel joining its apex from 
venter ; head always smooth, or practically so; apex of abdomen always with 
a definite formation of sete ; size medium small to very small, never large = (18). 
(8) Head punctate ; apex of abdomen ventrad without a definite naked path bounded 
by a definite row of setw; small tooth near (distad of) retinaculum always 
present ; second lobe of abdominal segments two to six smallest, longest at the 
meson ; prothorax not divided into distinct lobes dorsad .. Ss = (8), 
Head never punctate, rarely transversely wrinkled, usually smooth ; apex of abdomer 
ventrad often with a naked path bounded by a definite row or rows of set ; 
small tooth near (distad of) retinaculum often ab-ent; prothorax dorsad 
divided into two or more distinct lobes ; second lobe of abdominal segments 2 to 
6 shortest, longest at the meson a AO oH Bee Ai = (12). 
(9) Second lobe of anal segment dorsad with most of its surface somewhat raised anT 
bounded by an oval suture ; epicranial sclerite with a row of set near its cephalic 
margin and sete scattered over its surface; second antennal joint with two- 
sete. 
