1892] MARYLAND ACADEMY OF SCIENCES. 163 



cent, the posterior edge of the segments red, but with 

 the two apical segments more broadly banded with red, 

 the genital sheath red, short, subacnminate, tooth of the 

 apical segment of female short and acute, posterior 

 border of the last segment of the male deeply emar- 

 ginate. 



Length to end of abdomen 25-26; width of base of 

 pronotum 9-10; expanse of wing-covers YO-75 millims. 



This is the brightest colored species of the genus thus 

 far discovered in North America, which attains its richest 

 coloring in the neighborhood of Reno, Nevada. Speci- 

 mens of both sexes from this locality, captured June 21, 

 were kindly sent to me by Mr. Hillman. A much less 

 adorned variety occurs in other parts of Nevada, some 

 of which were obtained for me by Baron Von Osten- 

 sacken, who also collected two specimens in the vicinity 

 of Webber Lake, on July 23 and 27. 

 7. T. Blaisdellii. New sp. 



Black, polished, sericeous pubescent, long, narrow, 

 parallel-sided. Head black, pubescent, having longer 

 hairs on the side of the face and clypeus ; vertex deeply 

 excavated, especially on each side, the supra-antennal 

 tablets broadly margined with yellow, the outer edge of 

 cheeks yellow; sutures of the surface deep, the one on 

 base of head short, broad, yellow ; front long, prominent, 

 convex, with the transverse ribs and longitudinal sulcus 

 sharply defined, the clypeus with a sharp longitudinal 

 carina ; rostrum reaching upon the middle coxae, the 

 basal joint yellow; antennae short, black. Pronotum 

 deeply sutured, bordered narrowly with yellow, with the 

 humeral angles strongly produced, coarsely wrinkled, 

 broadly bordered with yellow continuously with the 

 posterior margin; middle line wide, polished, yellow, 

 the posterior margin abruptly reflexed, broadly yellow ; 

 the lateral margin a little expanded, with the edge 

 crenulated; pleural margins thick, reflexed, yellow; 



