TACHYUSA. 179 



latter about as lung as broad; abdomen linear. L. 1| 1. 

 llather common. T. uvida, Er. 



b. Thorax with a deep central furrow. 



Black, rather dull, somewhat fiat, with very fine gray 

 pubescence; legs pitcliy. Thorax about as long as broad, 

 narrowed toward base ; abdomen closely punctured. L. 1 

 — Ij 1. Eather common. T. sulcata, Kies. 



Ocyusa, 



A. Antennae and legs pitch-brown, l)ase of former, knees 

 and tarsi yellow-brown. 



Black, shiny. Thorax scarcely broader than long, some- 

 what convex, tolerably closely, moderately finely punctured, 

 posterior angles prominent, almost right angles ; elytra 

 moderately closely, rather strongly punctured in transverse 

 wrinkles ; abdomen very finely, not very closely punctured. 

 L. 1\ 1. Common. 0. matira, Er. 



2>. Antennae and legs unicolorous red-l)rown. 



Similar to 0. maura but narrower, thorax rather longer, 

 more distinctly narrowed l^ehind, posterior angles less 

 sharp ; punctuation rather closer. L. 1^ 1. Not common. 



0. 2yici7ia, Aub. 



Ojcifjmffa. 



A., Elytra not shorter than thorax. 

 a. Abdomen gradually narrowed. 



I, Thorax black or black-brown, margins often lighter. 



1. Length 2| lines. 



Pitch-black ; extreme side margin of thorax red-brown ; 

 elytra yellow-brown, with a triangular black spot round 

 scutellum, outer apical angle often blackish ; abdomen 

 with hinder margins of segments and apex red-brown ; an- 

 tennae pitch-black, their base and the legs yellow-brown. 

 Penultimate joints of antennae distinctly longer than 

 broad ; thorax slightly convex, a little shorter than elytra. 

 Scarce. 0. sj^ectahilis, Miirk. 



2. Length 1— If lines. 



A A, Elytra with a triangular darker spot round 

 scutellum. 



N 2 



