161 
wanting, the third stomach being sessile on the rectum without any inter- 
vening tract. This was the case in the Asopinae, represented by Apatet- 
icus and Perillus; in the rhopaline coreids (Serinetha, Corizus, and Har- 
mostes), also in Stachyocnemis of the Alydinae; in the male of Dys- 
dercus; in the Lygaeinae (Nysius, Lygaeus, and Oncopeltus), Cyminae 
(Ischnorrhynchus), and Geocorinae (Geocoris); in all Tingitidae and 
Aradidae (Corythucha, Piesma, and Aradus) ; and in representatives of 
many other heteropterous families examined. 
The Wing Venation 
The chitinized corium and differentiated membrane of the fore wing, 
as well as the wing folds in both wings, have greatly obscured the 
venation in the Heteroptera, and retarded its use in systematic work. 
Comstock and Needham, in the “Wings of Insects,’ Chapter III,* have 
figured the tracheation of the fore and hind wings of a pentatomid 
nymph, and the venation of a coreid fore wing. The pentatomid was not 
reared to the adult stage; but this is hardly essential, as the venation is 
very similar throughout the family. 
In the fore wing of Menecles insertus (Pl. XVI, Fig. 1) the vena- 
tion is unusually distinct for one of the Pentatomini. The folds or fur- 
rows are indicated by two fine impressed lines. One of these is nearest 
the costal margin, and does not reach the membrane. The veins are 
indicated by smooth, raised, pale lines. The one in front of the anterior 
furrow represents subcosta and radius united. At the end of the furrow, 
the radial sector branches abruptly off toward the center of the wing 
and curves toward the apex. In Menecles and the other Pentatomini.its 
basal part is not traceable. The posterior furrow, between corium and 
clavus, is bordered in front by media and behind by cubitus. The veins 
of the membrane are not shown in the drawings. They seem to be 
derived mostly from media and the radial sector. 
In the fore wing of Tessaratoma (Pl. XVI, Fig. 2) the venation is 
traceable throughout, and is evidently more primitive than in Menecles. 
It may appropriately be compared with the coreid venation, as in Anasa 
(Fig. 3). In Anasa the veins may be traced by transmitted light, but in 
many coreids (Alydus, Harmostes, etc.), they are marked by distinct 
raised lines. The principal difference between the two is in the remark- 
able length of the radiomedial cross-vein in the pentatomid. There is a 
suggestion of this cross-vein in the tracheal branching of media in Com- 
stock and Needham’s Figure 21 (Joc. cit.). 
The cydnine fore wing is quite like that of the pentatomids in vena- 
tion of the corium. The veins of the membrane, which are nearly longi- 
tudinal in the Pentatomidae, here appear to radiate from its inner angle. 
The line between corium and membrane is squarely transverse. 
In Scutellerinae and Thyreocorinae the fore wings show a remark- 
able modification related to the enlargement of the scutellum. The tri- 
angular area of the corium between the two furrows is invaded by 
* Am. Nat., Vol. 32, p. 250. 
