NO. 2107. DRA00NFLIE8, WASHINGTON AND OREGON— KENNEDY. 321 



genus and from Muttkowski's * Catalogue of the Odonata of North 

 America because of its uncertainty, Cabot having called it magnijica 

 because he had a female magnijica from the same locality. 



While I have neither reared this species nor collected it while in 

 the act of emerging, I feel sure that the single nymph and the 14 

 skins taken are Tnagnijica for the following reasons: (1) I took 12 

 males and 2 females of Macromia magnijica on this stream in the same 

 mile-long stretch in which the nymph and skins were collected; (2) 

 no other species of Macromia was taken on the creek and none other 

 has been taken in the State of Washington (I have a female mxignijica 

 from Lake Washington, Seattle, and Dr. E. M. Walker writes that 

 magnijica has recently been taken in southern British Columbia) ; and 

 (3) the nymph and skins were very evidently conspecific, as all agreed 

 m the described pecuharities. 



I wish here to thank Doctor Walker for the material of Macromia 

 illinoiensis Walsh used in the following comparative description. 

 This description is based on the single nymph deposited in the United 

 States National Museum, but it apphes equally well, except in color, 

 to the 14 nymphal skins. 



Nympli. — Length, 31 mm.; length of abdomen, 20, width, 11.5; 

 width of head, 8; length of hind femur, 13.5 (in skins, 14); length 

 of antenna, 5. 



Head broader than long, with short appressed hairs on the anterior 

 horn, on the bases of the antennae,- and on the sides below and behind 

 the eyes. Horn acute, densely hairy, and more erect than in illinoi- 

 ensis (fig. 152, magnijica; fig. 157 , illinoiensis) . Eyes very prominent 

 (see fig. 151), but hardly more so than in illinoiensis. Antennae (fig. 



153, magnijica; fig. 158, illinoiensis) with first three joints enlarged, 

 second and third joints hairy, fourth joint the longest, fifth the short- 

 est. The whole length of the antenna shghtly greater than that of 

 illinoiensis. On each hind angle of the head a prominent superior 

 tubercle, which is more sharply defined than in illinoiensis (fig. 152, 

 magnijica; fig. 157, illinoiensis). Sides of mentum straighter, and 

 posterior angles less rounded than in illinoiensis (fig. 148, magnijica; 

 fig. 154, illinoiensis). Usually two setae at base of each lateral lobe 

 on the inner face in illinoiensis and but one in Tnagnijica. In magnijica 

 the mental setae are usually four in a short row on either side, fol- 

 lowed at its imier end by a single detached seta, between which and 

 the median line are from one to four shorter irregularly placed setae. 

 In illinoiensis each main row of mental setae usually contains five, 

 with a single detached seta at its inner end, and other short irregularly 

 placed setae between it and the median line (fig. 148, Tnagnijica; ^g. 



154, illinoiensis). 



• Muttkowski, Richard A. Catalogue of the Odonata of North America. Bull. Pub. Mus. Milwaukee, 

 vol. 1, art. 1, pp. 207, May, 1910, issued June 27, 1910 . 



81022°— Proc.N.M.vol.49— 15 21 



