THE CANADIAN ENTOMOLOGIST. 



301 



SOME NEW WESTERN THAMNOTETTIX (HOMOPTERA). 



BV E. D. BALL, EXP. STATION, LOGAN, UTAH, 

 (Continued from p. 268.) 



Thamnotettix vespertina, n. sp. 



Resembling vastula, slightly stouter. Smaller, narrower and darker 

 than atridorsum. Green, with a faint smoky tip to elytra. Length, 5 mm. 



Vertex slightly obtusely angulate, not quite twice wider than long, 

 almost as long as the pronotum Disc slightly convex, anterior margin 

 broadly rounding to the front. Front as wide as long, distincdy narrowing 

 below. Elytra broad and moderately short, appressed posteriorly. 



Colour : Vertex straw-colour, with traces of smoky at the apex and 

 on the reflex portion of front. Face and below deep smoky, with irregu- 

 lar areas on clypeus, and gense paler and short arc on the front light. 

 The genital segments in both sexes straw-coloured. Pronotum and elytra 

 green, the apical cells of the latter slightly smoky. 



Genitalia : Female segment two-thirds as long as its basal width, 

 almost semicircularly rounding from the base to the slightly roundingly 

 emarginate, smoky and elevated apex. Male valve very large, obtusely 

 triangular, plates together, half wider than long, slightly roundingly, 

 narrowing to the broad blunt, almost truncate apices, which scarcely equal 

 in length the extraordinarily broad pygofers. 



Described from two females and two males from Beaumont, California, 

 collected by the author. The dark face and narrower head, as well as 

 the distinct genitalia, will separate this species from atridorsum, while its 

 blunt head will separate it from the preceding species. 



Thamnotettix visalia, n. sp. 



Resembling vastula, somewhat larger and with a slightly shorter 

 vertex. Green, with a trace of smoky on the apical cells. Length, 

 5.5 mm. 



Vertex right angled, half wider than long, disc slightly convex, acutely 

 angled with front, the margins bluntly rounding. Front slightly wider than 

 in vastula, distinctly longer than wide. Elytra moderately long. 



Colour : Vertex straw-yellow, face and below pale yellow. Pronotum, 

 except the anterior margin, green. Scutellum greenish-yellow. Elytra 

 green, becoming subhyaline beyond the middle and slightly smoky at the 

 apex. 



Genitalia : Female segment as long as its basal width, scarcely 

 narrowed posteriorly, the median fourth of posterior margin almost 



September, 1910 



