THE CANADIAN ENTOMOLOGIST. Ill 



each antenna, tegulae, a spot on the posterior angles of the pronotum, spot 

 on the propleurae,a broad line on the mesopleurae, mesopectus, spot above 

 the posterior coxae (sometimes two), sides of the basal plates, legs 

 beneath from the coxae to the tarsi except the hind tibiae and tarsi (the 

 middle tarsi are also sometimes black), yellow. Abdomen yellowish- 

 ferruginous except the basal dorsal segments (sometimes the abdomen is 

 almost entirely black). Wings dusky hyaline ; venation dark brown. 



Habitat. — Twenty-one males, Ute Creek, Costilla Co., Colorado, alt. 

 about 9,000 ft., July, 1907 (H. S. Smith, L. Bruner and R. W. Dawson) ; 

 2 males, Sierra Blanca, Costilla Co., Colorado, alt., 10,000 to 11,500 ft., 

 July (L. Bruner) ; 4 males, Florissant, Colorado, July, at flowers of 

 Heracleum lanatum and on /uncus, sp. (S. A. Rohwer) ; one male from 

 the top of Las Vegas Range, New Mexico, approx. 11,000 ft., Tune 2S 

 (Cockerell). 



This species is near variegatus, Norton, but distinguished at once by 

 the longer apical antennal joint (the apical joint of variegatus is distinctly 

 shorter than the preceding) and by the black tibiae, as well as many other 

 differences. 



Tenthredo Titus i, n. sp. 



Male: Length, 11.5 mm. Clypeus squarely emarginate ; labrum 

 rounded at the apex ; antennal joints somewhat produced at the apex 

 beneath, the third joint longer than the fourth ; head shining, with a few 

 fine widely-scattered punctures ; meso- and metanotum closely punctured 

 with well-defined punctures ; postscutellum with a medial carina, which 

 extends on the posterior part of the scutellum ; tarsal claws deeply cleft ; 

 inner spur of the anterior tibiae with a spur about one-third of its length 

 from the apex ; tran. rad. received near the tran. cub.; tran. med. received 

 in the basal third of the cell. Colour black, yellow and rufous ; head 

 black, except the clypeus, labrum, mandibles (the apices piceous), lower 

 half of the cheeks, palpi, a spot above each antenna, a spot between the 

 antennae, a spot on the upper inner orbits, which are yellow ; thorax black 

 above, except a spot behind the postscutellum and a transverse spot before 

 the basal plates, which are rufous ; posterior angles of the pronotum, 

 lateral angles of the pronotum, tegulae, mesepimera, except a transverse 

 black band below the tegulae, a vertical line below the posterior wings ; 

 spot above the posterior coxte, sides of the basal plates, and a narrow 

 apical margin of the same yellow; legs : four anterior coxte, four anterior 



