OSBORN AND BALL REVIEW N. A. SPECIES OF IDIOCERUS. I 33 



female will separate it from the preceding species, while the immense 

 discs on the short antennae render it a strikingly distinct species what- 

 ever its color. 



In the pale examples the spots on vertex and scutellum are very dis- 

 tinct but in the more heavily irrorate examples they are obscured, 

 while the white markings are very distinct. Thus answering Say's 

 description. 



It is probable that many of the references to this species also 

 included alternahis. 



Idiocerus rufus G. & B. 



Hemiptera of Colorado, p. 80. 



Reddish brown, face yellowish, elytra showing alternate light and 

 dark nervures except in the reddest specimens. Length, 5 mm.; 

 width, 1.5 mm. 



Face light creamy yellowish, scarcely marked, ocelli brown, prono- 

 tum chestnut, a narrow light line and a pale spot either side on the 

 disc, elytra sub-hyaline, the nervures obscured in the redder forms, 

 alternately light marked in the darker ones, pattern of marking simi- 

 lar to monilifera. Ultimate ventral segment rounding, the center 

 slightly excavated, male plate small, the styles broad and stout, an- 

 tennae without discs. 



Found on cottonwood at Ft. Collins, Colorado, by Prof. Gillette, 

 through whom the specimens were received. This species was de- 

 scribed from two extremely rufus specimens. The majority of the 

 specimens received were darker and showed the light maikings on the 

 elytra. The darker forms somewhat resemble moniliferce but all those 

 examined are smaller the face is narrow and lacks the characteristic 

 dark band of that species. 



Idiocerus mexicanus n. sp. 



Cinnamon brown, scutellum of a brighter rufous color. Resembles 

 rufus \y\x\. \'& considerably larger. Length, $ 6 mm.; cf, 5.75 mm.; 

 width, 2 mm. 



Head broad, vertex fairly broad, occiput and front nearly parallel, 

 face rather long, triangular, obtusely pointed below, genae with very 

 straight margins ; front and lor» distinctly tumid. Pronotum, width 

 twice the length, posterior margin scarcely emarginate. Elytral veins 

 distinct but not prominent, not tuberculate. 



[Proc. D. a. N. S., Vol. VII. ] i6 December i, 1898.] 



