184 



spotted with black. Head blackish ; vertex with au elevated longitudinal 

 line, which extends down over the frgnt, where it is grooved, but this groove- 

 does not reach the acute ridge which divides the vertex from the front. 

 Thorax (pronotum) flattened, somewhat granulated and whitish, laterally pro- 

 jecting a little over the origin of the elytra; a slightly elevated,' longitudinal, 

 central line, and two oblique, abbreviated, elevated lines near the bead. A 

 velvet-black spot each side over the tip of the elytra. Pleura, elytra, and 

 pectus black-brown. 



Length to tbe tip of the wings, half au inch. 



Near Philadelphia, Pennsylvania (Say). 



T. arenosa, Burm. 



Vertex broad at the front border, somewhat truncated ; margins sharp, 

 broader through the middle, though not so prominent as at the eyes. 



Fuscous, sometimes variegated with paler. Head elongate; eyes promi- 

 nent, and placed at the apex of the front. 



Length, 3.7 to 5 lines. South Carolina (Burmeister). 



T. dorsalis, Harr. 



Rusty-black, with ocher-yellow spots on the sides and legs, and a large, 

 rusty-red spot on the top of the thorax. Wings extending beyond the apex 

 of the thorax. 



Length, half an inch. Massachusetts (Harris) ; New York (Fitch). 



T. quadri?naculata, Harr. 



Ash-colored, with dark-gray above, variegated with black ; four velvet- 

 black spots on the top of the thorax. Wings projecting beyond the extremity 

 of the thorax. 



Length, 0.4 to 0.5 inch. Massachusetts (Harris). 



T. hilineata, Harr. 



Ash-colored ; thorax paler, with a narrow, angular, whitish line on each 

 side, extending from the head beyond the middle, the angular portion includ- 

 ing a long, blackish patch on each side. Wings in the male rather shorter 

 than the thorax (pronotum) ; in the female longer. 



Length, 0.35 to 0.45 inch. Massachusetts (Harris). 



T. sordida, Harr. 



Yellowish ash-colored ; thorax with minuf-e, elevated, black points. 

 Wings in both sexes rather longer than the thorax (pronotum). 



