AMERICAN ODONATA. 211 



1 9, Niles, Michigan; June 21, 1894- ; Healy, collector. James 

 Tough. 



1 S , Illinois. C. C. Adams. 



1 ^ , 2 9 , Rock Island, Illinois ; Walsh. M. C. Z. 



1 % , 1 9 , Rock Island, Illinois, " types " of fluvialis ; last seven 

 abdominal segments of 9 gone. U. S. Nat. Mus. 



This species is also reported from Quebec, Canada. 



5. Gompliiis plagiatus Selys. Syn. Gomph., p. 38 (or 57). 1854. 



Ab. %. 44-46; 9 43-44. H. w. % 34-36; 9 36-37. 



Antecub. f. w. 13-14; h. w. 10-11. 



Postcub. f. w. 9-11 ; h. w. 9-11. 

 Face in adults brown, greenish below, no very distinct markings; labrum 

 largely green; frons above bluish green, brown at base; in young specimens 

 the face is yellow; eyes in life grass-green above, below yellowish green. 

 Mesothoracic half-collar scarcely or not interrupted ; edge of mid-dorsal thoracic 

 carina yellow; dorsal stripes normally isolated (in a male, Sandusky, Ohio, 

 July 9, 18S9, R. C. Osburn, collector, in my collection), the dorsal pale stripes 

 widen below, and are continuous with the mesothoracic half-collar, and nar- 

 rowly continuous above with the antehumeral pale areas; second lateral stripe 

 interrupted near its upper end. In other respects, this unusual specimen 

 is normal in coloration. In a few other specimens the dorsal stripes approach 

 very nearly or are continuous, perhaps on only one side, with the half-collar. It 

 may be noticed that in the case of amnicola, where the dorsal stripes are not 

 entirely isolated above, they are continuous with the mid-dorsal area; the San- 

 dusky specimen of ^/rtf/iatws, on the other hand, has the dorsal stripes continuous 

 with the antehumeral s^tripes); antehumeral pale stripes as wide as dorsal stripes, 

 sometimes narrowed a little above; lateral stripes complete (note exception above 

 in case of the Sandusky specimen), only in tenerals is the first one ever appar- 

 ently incomplete. Abdomen brown or yellowish, a maculose longitudinal mid- 

 dorsal stripe. Femora brown, darker apically ; tibite and tarsi black : femora pale 

 in tenerals. 



-jj . — Accessory genitalia brownish, usually pale; second hamule similar to 

 notatus in shape and direction, but not so slender; 7-9 slightly dilated, about as 

 in the two preceding species ; 8-10 largely reddish yellow in color, the extreme 

 edges of 8 and 9 black ; appendages reddish brown, yellow in tenerals. 



J .—Abdominal colors usually indistinct; 8-10 reddish yellow, not so red as in 

 the male, 9 usually the brightest; 8 and 9 very little dilated; vulvar lamina 

 about one-eighth to one-ninth as long as the sternum of 9. 



Material Examined. 



1 I , Manainu.skin, N. J.; September 3, 1900; Daecke, collector. 

 Acad. Nat. Sci. Phi la. 



1 S , 1 9 , vicinity of Philadelphia, Pa. ; Philip Nell, collector. 

 Dr. P. P. Calvert. 



1 9 , Fairmount Park, Pa. Dr. P. P. Calvert. 



TRANS. AM. ENT. SOC, XXVII. MAY, 1901. 



