APPENDIX. 317 



This species resembles the bifasciatus, nob.,* of which 

 the only specimen I have seen is a female. On compar- 

 ing the two species, it will be observed that the above de- 

 scribed insect is larger, and of a somewhat more slender 

 form ; the surface of the head and thorax is much more 

 smooth ; the rufous band instead of being on the fourth 

 segment, as in that species, is on the fifth, &c. 



2. T. verticalis. 9 Head pale yellow ; vertex and an- 

 tennas black ; tergum yellowish, spotted with black, tip 

 black. 



Inhabits North-west Territory. 



Mandibles piceous at tip ; antennse rather long ; vertex 

 with a somewhat lobated, large black spot, extending by a 

 process down between the antennse, and connected with 

 another large spot on the occiput ; neck, a black line each 

 side ; thorax black, about four oblique, short lines in the 

 centre, and dilated line before each wing, yellow ; wings 

 hyaline, stigmata and nervures fuscous, costal edge dull 

 yellowish ; scutel yellow ; metathorax black, a triangle at 

 base, two dots and behind, yellow ; pleura black, a yellow 

 spot near the anterior wings and another over the posterior 

 feet;yee^ yellow, slightly varied with pale testaceous ; poste- 

 rior thighs black on the terminal half, their tibiae black at tip ; 

 tergum yellow, with a testaceous tinge, second, third, and 

 fourth segments two-spotted on each : those of the anterior 

 one nearly confluent ; fifth immaculate, terminal ones black; 

 venter pale yellowish, black at tip. 



Length of the body three-twentieths of an inch. 



3. T. rufipes. $ Black ; mouth yellow ; feet rufous. 

 Inhabits North-west Territory. 



Antennae moderate ; hypostoma emarginate with a re- 



♦Western Quarterly Reporter, vol. 2. p. 72, 

 Vol. II. 41 



