ART. 2 KEVISION OF TRIEHABDA NORTH OF MEXICO BLAKE 17 



Distrihution.—Msissachnsetts-, New York (Lake Placid); West 

 Virginia; Michigan; Minnesota; North Dakota; South Dakota; 

 Missouri; Montana; Washington; " Fort McLeod, British America." 



Food plant. — Unknown. 



Remarks. — This species has been confused with virgata and con- 

 vergens in collections. It is smaller, more slender, and with finer 

 olytral punctation then virgata. In fact, some specimens, probably 

 because of the fine punctation, have been labeled canadensis., but it is 

 quite distinct from canadensis in its smaller size and heavier mark- 

 ings and sparser elytral pubescence. It usually differs also from 

 both virgata and canadensis in having a wide black band across the 

 base of the head, curving broadly down over the front. It is more 

 closely related to convergens, but is not so small or with so long 

 pubescence, and lacks metallic luster in its dark markings. The pale 

 vittae are usually wider than in convergens and extend to the apex. 

 The western specimens from the Kocky Mountain region have a 

 darker ventral surface than the eastern ones, which are almost en- 

 tirely pale beneath. The aedeagus in horeaUs is not so heavy or so 

 long as in virgata, and the tip is more acutely narrowed in contrast 

 to the broader, blunter tip of virgata. 



TRIRHABDA BOREAUS INDIGOPTERA, new variety 



Description. — Larger (G mm. to 8 mm, long, 2.5 mm. to 3.5 mm. 

 wide) ; vittae usually deep blue or purplish, rarely green. Body 

 beneath mostly pale. 



Type. — Collected at Brookings, S. Dak. (Knab collection). U. S. 

 N. M. No. 43018 (with 14 paratypes). 



Distrihution. — Illinois, Minnesota, North and South Dakota, 

 Kansas. 



Remarks. — The elytral vittae are so deep blue or purplish that 

 unless they are examined closely or compared with specimens having 

 black vittae, the bluish hue is not readily seen. This variety is about 

 the same size as virgata, with which it has been confused in collec- 

 tions, although it is slightly more slender and has finer elytral 

 punctation. 



6. TRIRHABDA NEOSCOTIAE, new species 



Plate 1, Figure 6 



Description. — Small, subparailel, not shining, pale, with wide 

 black occipital plaga, rather large pronotal spots, and very dark 

 blue or bluish green (appearing nearly black) wide lateral and 

 sutural vittae; ventral surface mostly dark. Head alutaceous with 

 obsolete coarse pmnctures, finely and sparsely pubescent; a wide 

 black occipital plaga extending across base of head and curving 

 down front, but not attaining margin of eyes. Antennae with 

 54290—31 3 



