169 
Pronotum with distinct transverse impression near middle; small black 
species. 
Sides of pronotum and head entire—Fla., Tex., Ariz., Cal., Vancouver 
CVD eae errnteleys ars topes talsreva cine cemayeles wie sie eiale s(atvisiavarere eieists Camirus Stal. 
Sides of pronotum and head denticulate.................. 4. Acantholoma. 
Osteolar opening nearer to side margin than to hind coxa, without canal. 
Costal border of elytra exposed beyond middle of seutellum. 
Connexivum distinctly exposed in part (N. Y., Md., D. C., Fla., Tex., Ariz., 
PERO CA TIEN tredraretsiaestis wicca anime clave ae RAT hatumielciaiee chacviveleus taal Tetyra Fabr. 
Connexivum very nearly or quite covered by scutellum (Cal.?, Mex. to 
PAE AEN) LER cree oneal carter chalccet es Peuvin armale a iauscsYatiele tye icrsseceinis\a as Pachycoris Burm. 
Costal border of elytra covered by scutellum except basally (S. C., Ga., Fla., 
BIDE CAD PRATT ai \let eat aty or Meena lel leatepereieb aes Tait ala dat sver supa cleo suriasl oe {6.0% Chelysoma Berger. 
|. Homarmus Dall. 
In our series I have been unable to verify satisfactorily the minute 
structural specific differences given by Van Duzee, and my previously 
published key * depends too much on the form of the color-pattern. 
[| The shape of the anterior platelike extension of prothorax on venter 
is very characteristic, and as it is useful in separating the southwestern 
species proteus from the other three | have figured it (Pl. XVII, Fig. 
12-15) for all four species. ] 
Key To SPECIES 
NYMPHS 
Pronotal lateral margin minutely serrulate, almost entire; an impunctate white 
callus in front of the terminal pore of each scent-gland. 
Lateral plates black on inner half, pale outwardly; callus large and conspicu- 
OUS; Har ASPArsey a WLASSYMUSECK > yale sy alslals nccieicleisicle a.ersitis ese e's\nle\< aenifrons. 
Lateral plates with black line on inner margin, and black dot in outer half; 
callus reduced, not very conspicuous in the general lighter brown of the 
dark areas; hair dense and fairly straight; little or no brassy luster....... 
albailds Jena a Peoo te GOI bie cides Ato Serr Etc CAC OR HOLA eheTe “LOOT Ch CRO. Rte REE PNET ER parvulus. 
Pronotal lateral margin rather coarsely acutely denticulate; no white callus; 
‘hair dense, curled; lateral plates with a black line on inner margin and a 
black spot occupying half or a third of the outer margin [Tex., Mex.]. .proteus. 
IMAGINES 
Head above bronzy black, sparsely short pubescent, without yellowish border; 
costal border more or less barred with black; pattern obscure, more or less 
MNTOUH EG er OTEet Ete Oe EIN IN ce tercrate eyaictal efainew relates: « lc) siele let: stats! <%e)ehs'slafere o aslare a aenifrons. 
Head above black or bronzy black, with yellowish margin or submarginal line; 
costal border pale; general color pale yellowish, with pattern more or less 
distinct. 
* Bul. Ill. State Lab. Nat. Hist., Vol. 7, p. 264. 
