1913.] NATURAL SCIENCES OF PHILADELPHIA. 267 



(ectal) edge as a blunt cylindrical process one-half to one-third as 

 wide as the proximal part of the appendage; the abrupt contraction 

 from the proximal part to the distal process is made by a right-angled 

 "shoulder." 



I have not been able to detect any differences either in these 

 appendages or in the genitalia of the second abdominal segment of 

 the males from the four different localities. 



Young d^ . — Differs from the adult cf in the absence of pruinosity, 

 in the paler hue of the yellow areas generally, in having pale yellow 

 where the adult has luteous; metallic violet on the head paler, 

 bases of the mandibles and a spot between each one and the adjacent 

 eye yellow, metallic violet or metallic brown instead of metallic green 

 on the thorax, an indistinct narrow yellowish stripe on each side of 

 the mid-dorsal thoracic carina, a bright yellow line on the humeral 

 suture, coxse and trochanters pale yellow, pterostigma paler brown 

 with a pale luteous line just within each bounding vein, dorsum of 

 abdominal segments 1 and 2 metallic blue, of 3-7 dark brown, darker 

 at the hind end of each where it is continued ventrad as in the adult, 

 most of the ventral surfaces of 7-10 pale j-ellow, except at the hind 

 ends of 7 and 8 which are blackish, proximal half of the inferior 

 appendages yellowish ventrally. 



9 . Differs from the adult cf as follows : Dark color on the nasus, 

 rhinarium and labrum shining black instead of metallic violet. Sides 

 of the first two (confluent with the transverse yellow band below), 

 bases of the mandibles and an oblique band running from each eye 

 upward (dorsad) and inward (mesad) on to the anterior surface of 

 the frons to a variable distance (not correlated with amount of 

 pruinosity on body), bright yellow. A narrow stripe on the humeral 

 suture, a wider stripe on the first lateral suture and on the mete- 

 pisternum bordering the second suture, yellowish. Pruinosity on 

 the thorax in slight quantity on the sterna and metapleuron, or on 

 the sterna only. Coxae and trochanters yellow. Pterostigma as 

 described for the young male, pruinose on the under surface. No 

 pruinosity (or but a trace of it) on the dorsal side of abdominal 

 segment 9, but present in slight traces on the sides inferiorly of 1-8 

 and in somewhat greater amount on the sternites of 1-8. Hind 

 margin of 10 with a narrow mid-dorsal notch about one-fourth as 

 deep as the length of the segment, from which runs a low median 

 carina to the anterior end of the segment; ventral surface of this 

 segment pale brown. Abdominal appendages about twice as long 

 as segment 10, not as long as segment 9, straight, slender, tapering 

 to an acute apex, black. 



