167 
Subfamily SCUTELLERINAE 
The species of this family exhibit a considerable variation in color- 
pattern and ground-color, and care must be exercised to draw the specific 
lines correctly. 
[In examining both nymphs and imagines in our collection I have 
been struck by the fact that the Scutellerinae have the prothorax pro- 
duced anteriorly on each side on venter in the form of a sharp plate which 
assumes different outlines in different species, but in all of them the plate 
of each side is curved caudad just mesad of the outer margin of the fore 
coxa and forms a ridge on each side of the medial line; in the groove thus 
formed the rostrum lies in similar manner as in that on venter of head. 
In none oi the other subfamilies except Acanthosominae is there invari- 
ably such plate-like anterior extension of the prothorax, the only other 
exceptions known to me being Trichopepla and Aelia. I have refrained 
from introducing the character in the subfamily key as I am not suffh- 
ciently familiar with the Pentatomidae to judge as to the importance of 
this character. It is pertinent however to mention that the prothorax in 
most of the Cydnidae has the same characteristic central ridges anteriorly 
as in Scutellerinae. | 
Key ro TRIBES 
NYMPHS 
Mediodorsal plate of anterior scent-gland nearly straight, narrow, slightly 
broader at each end to contain the terminal pore, but not extended back at 
the sides of the scent-gland, the pores of the two glands dissimilar (Eury- 
EENSVIGYHI WS 2 ide DET IAS AR OMeiT cisc Reumne eine Bl) ar a CHR eve ee ope eRe ODONTOTARSINI. 
Mediodorsal plate of anterior scent-gland very narrow in front of the next plate, 
greatly expanded backward on each side of it, so that the terminal pores of, 
the first gland are laterad of those of the second, all being similar in appear- 
ance and similarly prominent (Homaemus)...........-..-..+++05+- TETYRINI. 
IMAGINES 
Menten without Strigulatory areas. .c. uscac cee. tecch sce oe ODONTOTARSINI. 
Venter with median iransverse pair of lustrous finely striated stridulatory 
areas, borne on at least the 4th and 5th ventrals.................. TETYRINI. 
Tribe ODONTOTARSINI 
Key To GENERA * 
Osteole distinct, continued in a narrow canal; connexivum rather broadly 
ERO NE meters alerg aly hctenalcuelcvcrate, Saletan atau so cLaue Vote wveiyl ate vern ar oho te Sib epee fF 1. Eurygaster. 
Osteole indistinct, without evident canal. 
Head gradually narrowed to tip, not truncate anteriorly; body silky-pubescent 
PRMOL OWA Vevce MASE Nev rit ol Pitw Mi cscietie venice a oleate ove ae Sw ae eS ee alate Fokkeria Schout. 
¢ . 
* In this key and in those which follow, numbers before generic names indicate 
genera which are treated in the text. 
