SUBFAMILY II. OEDIPODIN.K. 



287 



of metazona is flat and usually much less rugose than among the 

 members of Tribe I. Our species are all ammophilous or saxi- 

 colous in habitat, dwelling along the sandy beaches of sea or lake, 

 in old fields or along roadsides in extensive sandy areas, or on 

 rocky ledges in densely wooded districts. None of them inhabit 

 the open pasture lands and meadows as do the Arphias, Spharage- 

 inons and other members of the tribe Hippisci. Four genera rep- 

 resent the tribe in the Eastern States. 



Fig. 1 06. a, Wing of male of Hippiscus apiculatus; b, same of Circotettix verrucu- 

 latus; c, pronotum of Trimerotropis inaritima. (After Morse.) 



KEY TO EASTERN GENERA OP TRIMEROTROPI. 



a. Pronotum strongly constricted, its median carina subcristate, cut by 

 the principal sulcus at or near the middle, the metazona but 

 slightly longer than prozona; disk of vertex between the eyes as 

 broad or broader than long; antennas strongly flattened basally, 

 those of male as long as or longer than hind femora; lower hind 

 angle of lateral lobes not broadly rounded; smaller, females not 

 over 25 mm. in length. 



1). Basal third of prozona not scutellate: occiput without tubercles; 

 foveolse small, shallow, subcircular; hind tibiae dull greenish- 

 white with a dusky ring at basal third, the knee and apex 

 fuscous. I. PSLNIDIA, p. 288 



6&. Basal third of prozona between the notches scutellate, i. e., form- 

 ing an ellipitical plate or disk with raised edges; occiput with 

 a number of small tubercles; foveolse (in our species) large, 

 distir.ct, triangular; hind tibias pale blue with a whitish ring 

 near base. II. MESTOBREGMA, p. 290 



aa. Pronotum much less constricted at middle, its median carina low, 

 cut by the principal sulcus in front of middle, the metazona dis- 

 tinctly longer than prozona; disk of vertex between the eyes longer 

 than broad; antennae filiform, always shorter than hind femora; 

 lower hind angle of lateral lobes broadly rounded; larger, the fe- 

 male 27 or more mm. in length. 



c. Hind tibiae not fuscous near base and tip; general color light 

 brown or buff, or pale gray; radiate veins of anal field of wings 

 not enlarged. III. TRIMKROTROPIS, p. 292 



cc. Hind tibiae fuscous toward base and at tip; general color dark 

 gray or black; radiate veins of anal field of wings distinctly 

 swollen. IV. CIRCOTETTIX, p. 299. 



