388 PROCEEDINGS OF THE NATIONAL MUtiEUM. vol.37. 



with a yellow streak (the only North American Macromia in which 

 segment 1 is not laterally concolorous). Costa distinctly yellow to 

 the wing tip. Femora pale basally. 



Of this species I have seen only Hagen's 6 types, 3 of each sex, 

 kindly loaned me by Mr. Henshaw. It is possible that the color of 

 these specimens may be very different from the colors in life. How- 

 ever, no other basis for description than these specimens is before me. 



Hale. — General color pale reddish brown, darkest on abdominal 

 segments 3-6. Face very light yellow, nearly white, frons in front 

 and anteclypeiis slightly darker; lips and rear of eyes, excepting the 

 dorsal third, the same pale color; a very narrow brown streak in 

 sulcus of frons; the lateral pale areas extensive and extending to 

 postclypeus; vesicle pale (a character it shares only with magnifica). 



Abdominal spots large, not separated dorsally on 3-8, otherwise 

 similar to 2>«ci^<"«, but less distinct (i.e., less sharply defined) and the 

 merest trifle more separated b}^ dark color from the base of each seg- 

 ment; beneath 7-10 are largely pale colored, especially basally; dorsal 

 spot on 3 broadly connected posteriorly with the inferior pale longi- 

 tudinal area, leaving only a basal ring and a posterior projection from 

 this on either side dark colored; spots on 7 and 8 encircling the 

 segments basally. 



Wings hyaline; stigma yellowish brown. 



Abdominal appendages distinctly diiTerent from those of other 

 species ; seen from above the superiors are straighter and much wider 

 beyond the median external tooth than in any other species; in 

 facifica, for example, they taper continually from the tooth to the 

 apex, while in annulata they widen from the tooth to before the apex, 

 which is broadh^ rounded; seen in profile the same is true, and instead 

 of the upper and lower edges converging slightly there is a distinct 

 subapical inferior dilatation; there is an indistinct, pale, dorsal basal 

 area; the inferior appendage is slightly but distinctly shorter than 

 the superiors. 



Female. — Similar to the male, but the dorsal spots on 4 are dis- 

 tinctly and on 5 and 6 indistinctly connected just anterior to the 

 transverse carina with extensive but indefinite and suffused inferior 

 lateral longitudiiud stripes; there are faint traces of dorsal basal spots 

 on 9 and 10. 



"Wings hyaline, the faintest trace of basal brown in the costal 

 spaces. Three females show all triangles and subtriangles free. 



Vulvar lamina apparently much as in pacifica, not distinct, but 

 there seems to be a slight projection posteriorly on either side of the 

 trough. Abdominal appendages similar to illinoiensis. 



Material examined. — Pecos River, June 26, July 13, August 4, and 

 1 female without date, 3 males, 3 females. Captain Pope (M. C. Z., all 

 bearing Hagen's red and Mdiite card type labels). Total, 3 males, 3 

 females. 



