algal 
Aulacostethus simulans Uhler, Bul. U. S. Geol. and Geogr, Surv., Vol. 1, No. 
5, sec. ser., p. 272. 1876. 
The only Illinois specimen in our collection is a female taken at Cob- 
den May 9, 1918, by the writer. The species has been recorded by Van 
Duzee from N. Y., Md., N. J., N. C., Ga., Tex., and Cal. In the Bolter 
Collection there are specimens from Arizona. ~ 
I can not detect the central ridge on hind tibia in this species even 
at base, and in this respect it very closely resembles specimens from 
Florida in the Bolter Collection labeled Symphylus, and recorded in the 
next paragraph. I have figured the dorsal aspect of head (PI. XVII, Fig. 
16), osteolar opening (Fig 21), anterior outline of ventral lateral portion 
of prothorax (Fig. 19) and genital segments (Fig. 24) of Stethaulax 
marmoratus and this Symphylus species (figures cited in next paragraph ) 
to illustrate the distinctions between them. These Florida specimens 
undoubtedly represent a species not included in our North American list. 
.38. SympHy.us Dall. - 
This genus is now included for the first time among the Nearctic 
genera by reason of several examples of a species in the Bolter Collection 
labeled Symphylus, from Indian River and Point Orange, Florida. [ (Pl. 
XVII, Fig. 17, 20, 22, 23; cf. with figures cited in previous paragraph.) ] 
4. AcANTHOLOMA Stal . 
ACANTHOLOMA DENTICULATA Stal 
Acantholoma denticulata Stal, Enum. Hemip., Pt. 1, p. 17. 1870. 
Four specimens in Bolter Collection and one in Natural History 
Survey collection, all labeled “N. Ill.”; one specimen, Dubois (S. IIl.), 
August 8, 1917 (J. R. Malloch); Kan. (Kirkaldy); Ind. Il., Kan. 
@VaDs): 
‘ 
Subfamily GRAPHOSOMATINAE 
Key TO GENERA 
Side margin of pronotum at anterior angle bearing a tooth. 
‘ 
PUM PREITE HLS RTSUN Gh LUC HUE LTA G Soiuis (cre clegnianalical pier wre ate ape eeel as tanw isis ain nena bic! ooh Amaurochrous. 
ARSUicate metasternial earings (COW) ee siemisie cisisicas's os sissy «sae ws Weda Schout. 
Side margin of pronotum at anterior angle bearing a subquadrate lobe, the 
apical margin denticulate (Va., Tex., Vancouver)............ Oncozygia Stal. 
AmAurRocHROUS Stal (Popors Lap: ) 
Smaller species, male 444-6 mm., female 6-7 mm. 
Anterior pronotal tooth narrow, apical angle about 45°, sides of pronotum 
with slight sinus near middle, otherwise nearly straight from anterior 
tooth to apex of posterior tooth, which has an apical angle of about 60°.... 
PUR ee eer ere Neate deh of acted Ferey tel crave, sete bie sue catak ens: s*eCEjaheip che ai'aieieic'e.¥ c/abete parvulus. 
Anterior pronotal tooth broader, apical angle 60°-90°, sides of pronotum 
markedly sinuate, nearly transverse behind the sinus, suddenly rounded into 
an obtuse lobe on the posterior tooth, so that its apical angle is about a 
ANS RU FemecULE es LEMS nD eee cc etctehne eae clin usa ae: eda telainy vt'c)-oie\ ators saat cain: Sipt damehsWene Nah oh wire cinctipes. 
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