456 ENTOMOLOGICAL NEWS. [May, 



pale bluish. Prothorax black, blue as follows ; a transverse stripe cov_ 

 ering the anterior half of the first lobe, a cuneiform spot on either side 

 and the sides of the middle lobe, and narrowly on the posterior border, 

 which is entire, flattened above. Thorax with the following black : a 

 mid-dorsal stripe, a humeral stripe, wider below, and a line on the upper 

 third or fourth of the second suture. Abdomen with the following black : 

 base of i ; an orbicular apical spot and a very narrow apical ring on 2 ; 

 the dorsal spot and apical ring on each of 3-7 connected ; dorsum of 3 

 with the apical half or third ; 4 with the apical half or three-fifths, nar- 

 rowed anteriorly ; 5 with the apical three-fifths or two-thirds, narrowed 

 anteriorly, but wider than the corresponding part of 4 ; 6 with the apical 

 two-thirds or three-fourths, but little narrowed anteriorly ; 7 entirely, ex- 

 cepting a blue basal ring, the black of uniform width ; 10 entirely. Legs 

 pale bluish, femora with a black line on the dorsal surface, tibiae with 

 a black line on the anterior surface. Pterostigma black ; 3 antenodal 

 cells. Superior appendages in profile about as long as 10, bifid, the lower 

 branch short, extending posteriorly scarcely one-third the length of the 

 appendage, its apex directed ventrally, internally and slightly anteriorly ; 

 the upper branch is cylindrical, little curved till in the apical third, which 

 turns inward and downward ; between the two branches on the inner sur- 

 face is a pale tubercle which extends posteriorly beyond the lower branch. 

 Inferiors about three-fifths as long as the superiors, directed upward and 

 inward. 



9. Head and thorax similar to the male ; mid-dorsal thoracic carina 

 pale ; posterior border of the prothorax with a low median elevation 

 and a smaller one on either side ; the lateral elevations are black, con- 

 tinuous with the black of the middle lobe, the remainder of the border 

 pale. Abdomen with dorsum of 2-10 black, 10 very narrowly ; sides 

 and basal rings yellow or greenish. 



Sheep Creek, Albany Co., July 23, 1899, 8 <? ^ , 3 9 9. 

 Named for Mi.ss Anna Tribolet. 



Mr. Hine writes me that specimens of this species, from 

 Arizona, are in the Kellicott Collection tinder the name pnc- 

 varum. In a specimen of prtrvarum from Mexico, collected 

 by Mr, and Mrs. Deam (PI. IX, figs. 4, 6), there is no pale 

 tubercle, the appendages are .shorter and less conspicuous, the 

 lower branch of the superiors is wider and longer, with the 

 apex directed posteriorly, and not at all anteriorly, as in amia .• 

 the inferiors are .slenderer and, when compared with the su- 

 periors, relatively longer. Dr. Calvert says that the differ- 

 ences here indicated between pravanivi and anna are shown 

 by a comparison of a type of prtcvarum and .specimens of the 

 Wyoming species which I sent him. Moreover, specimens 



