212 long's second expedition. 



% Cheeks entirely yellow ; a yellow spot on the pleura above 

 the anterior feet, connected with the thoracic line ; tergum yel- 

 lowish-rufous, dusky at tip and black at base ; venter yellowish- 

 white, dusky at tip. [317] 



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

 only specimen I have seen is a female. On comparing the two 

 species, it will be observed that the above described 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 antennae 

 black ; tergum yellowish, spotted with black, tip black. 



Inhabits North-west Territory. 



Mandibles piceous at tip , antennae rather long ; vertex with a 

 somewhat [lobated, large black spot, extending by a process down 

 between the antennae, 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 ; feet yellow, slightly varied with pale testaceous ; posterior 

 thighs black on the terminal half, their tibia? 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. — 9 Black; mouth yellow; feet rufous. 

 Inhabits North-west Territory. 



Antennae moderate ; hypostoma emarginate with a regularly 

 [318] curved line, yellow; labrum nearly orbicular, and with the 

 mandibles pale yellow, the latter piceous at tip ; stethidium and ab- 

 domen black, immaculate; wings with fuscous nervures, stigmata 



* Western Quarterly Reporter, vol. 2, p. 72.— [Ante, p. 162.] 



