1905. ] HEMIPTERA OF THE SUBFAMILY HALYIN&, 147 
more or less ‘‘elongated body.” Berg* has described two new 
genera from the southern parts of South America, Proczelicus 
and Lobepomrs, which he says are allied to the genera Amawrochrous 
Stal and Oncocoris Mayr; but judging from the descriptions it 
seems very doubtful whether they belong here, the more so as 
Amaurochrous does not appertain to the Halyineatall. Distant > 
has also described an African genus, Crolliws, which he places 
near Platycoris, but as nothing is said in the description as to the 
presence or absence of the strigose ventral patches, its position is 
uncertain, It is said to have the “rostrum about reaching the 
anterior cox”; if this be correct, it scarcely belongs to the 
Halyine. Besides the seven genera referred to this group by Stal, 
there is one described genus which appertains to the same group, 
viz. Commius Stil. Stal overlooked the striolated ventral patches 
of this genus and therefore incorrectly placed it among the 
Pentatomine s. str., near Chaleocoris Dall. For this division of 
the Halyine I propose the name Platycoraria; all its genera, 
except Mecidea, are Australian, two of them (Oncocoris and 
Caridophthalmus) extending to the Austro-Malayan region (New 
Britain, New Guinea, Timor, Flores, Ceram). 
As Stal= calls the strigose ventral patches of the Tetyraria 
“ macule stridulatoric,” but only speaks of “ vitic strigose” in the 
Platycoraria, it is evident that he did not recognise their true nature 
in the latter division. A close examination of the ventral patches 
of the Platycoraria shows, however, that they are perfectly 
homologous to the strigose areas of the Tetyraria. As described 
by Handlirsch, the stridulatory organs of the Tetyraria are made 
up of two different parts—(1) the passive element, consisting of the 
strigose ventral patches ; and (2) the active element, consisting of 
a series of minute wart-shaped tubercles, bearing a subapical 
tooth or bristle and placed on the inner side of the tibie, The 
ventral patches are straight and situate on each side of the 
median line of the fourth and fifth segments, sometimes extending 
to the third or sixth segment; they converge behind and the 
striz are arranged longitudinally, beimg nearly parallel to the 
axis of the body. When the insect bends the tibia against the 
femur and again stretches it, the spinous tubercles of the tibia 
pass across the strigose surface of the venter, thus enabling the 
insect, by rapidly repeating these movements, to produce an 
audible sound. In the Platycoraria both the active and the 
passive parts of the stridulatory organ show the same structure 
as in the Tetyraria, but the ventral patches are usually comma- 
shaped, a little elevated and placed near the base of the venter, 
beginning with a rather broad base at the anterior margin of the 
second segment and proceeding, gradually tapering and curved 
inwardly, to the posterior margin of the third (rarely second) 
segment, where they end not far from the median line, The 
* An. Soc. Cient. Arg. xxxii. pp. 234 & 236 (1891). 
+ Aun. & Mag. Nat. Hist. (7) vii. p. 21 (1901). 
~ Enum. Hem. iii. p. 3 (1873). 
Os 
