October 1S95.] 



PSrCHB. 



28'J 



the body is also more compressed and 

 the hind tibiae are usually heavily iiifus- 

 cated. This section is worthy of sub- 

 generic distinction. In the others the 

 disk of the prozona is more or less 

 elevated on its posterior portion, rising 

 broadly upon the carina, rendering it 

 less compressed in that part ; the lat- 

 eral carinae are usually more distinct; 

 the body is less compressed, and the 

 hind tibiae red, sometimes annulate 

 with pale next base. The species 

 showing this structure are referable to 

 a " high" and a >' low" series, though 

 they are closely lelated and it is proba- 

 ble that connecting forms will be found". 

 In the "high" forms {coUare series) 

 the carina is well or highly developed, 

 much compressed, and the hind margin 

 of the pronotum shows a tendency to 

 be strongly acute-angled with excavated 



sides. In the "low "forms {aeq?iale 

 series) the carina is low or carinate and 

 the hind margin is more nearly or quite 

 rectangular with straight sides. This 

 series is represented in New England 

 by saxatile. The form described here 

 as humile has the carina so little devel- 

 oped as to leave some doubt regarding 

 its proper position in the hoUi or the 

 aeqitale series. 



Whether the genus should be ex- 

 tended to include additional species re- 

 mains to be learned by study of the 

 forms most closely allied ; whether it 

 is an entirely natural group as it stands 

 is perhaps a little questionable. As 

 here treated it follows closely the char- 

 acterization given by Scudder when 

 established ; and by Saussure, who 

 places it as a subgenus under Dissos- 

 teira (Prod. Oed., 134-135). 



Fig. I, la, lb, S. crepitans. $. Fif. 2. 2a, 2b, S. boUi^ 9- fif. 3, .T. aeqiiale. ? ; 3a, rS ■ Fig. 4, .S", saxatile, 9 ; 4S. 

 <f Fif. 5. 5a, 5. cristatnitt, 9- Fir. 6, 6?, .S". collare, 9- 



