NO. ii04l. THE INSECT FAMILY DELPHACIDAE— CRAWFORD. 633 



IDIOSYSTATUS ACUTIUSCULUS (Spinola?) Berg. 



Idiosystatus acutiusculus Berg '84: 134. 

 Locality. — ^Rio Santa Cruz, Patagonia. 



Genus IDIOSEMUS Berg. 



Idiosemus Berg 'S4- 140. 



Berg's description is as follows: 



Body elongate, attenuate at both ends; vertex produced triangularly in front of 

 eyes; vertex plane, twice as wide at base as length, acuminate, margins sharply 

 carina te; median percurrent to base undivided; posterior margin sinuate; frong 

 lanceolate, convex; median carina reduced, apex truncate, margins elevated sharply; 

 clypeus tricarinate. Antennse medium in length, terete, II four times as long as I. 

 Eyes deeply emarginate beneath. Scutellura 4-carinate. Elytra oblong, apex 

 scarcely rounded, venation as in Bergia. Legs short; hind tibiae trispinose; tarsi 

 much shorter than tibia?. 



Type of genus. — Idiosemus xipMas Bei'g. 



IDIOSEMUS XIPHIAS Berg. 

 Idiosemus xtphias Bbrg '84: 140. 

 Locality. — ^Uruguay and Patagonia, on Baccharis cordifolia. 

 This genus, Berg says, resembles Tropidocephala, but differs in the 

 scutellum and hind tibiae, and the absence of the median frontal 

 carina. The genus seems to be quite distinct, but I have not placed 

 it in the synopsis of genera because the form of the calcar is not 

 given. All three of these last-named genera probably belong in the 

 fii-st group of genera with the spiniform or cultrate calcar. 



UNCERTAIN SPECIES. 



DELPHAX PRODUCTA Walker. 



Delphax produda Walker '50: 353. 

 Locality. — Jamaica. 



DELPHAX LUTEIVITTA Walker. 



Delphax luteivitta Walker '50: 354. 

 Locality. — United States. 



DELPHAX UNICOLOR Walker. 



Delphax unicolor Walker '50: 354. 

 Locality. — Hudson Bay. 



DELPHAX HEMIPTERA Germar. 



Delphax Jiemiptera Germar, Stett. Ent. Zeit., vol. 19, p. 192. — Ashmead '10: 131. 

 Locality. — Sitka, Alaska. 



DELPHAX SENILIS Scudder. 

 Delphax senilis Scudder, Tert. Ins. N. America, vol. 2, p. 295. 

 Locality. — White River, Colorado (?), or Utah (fossil). 



