Mirch 1895.] 



PSYCHE. 



211- 



species occurring under two or three 

 names, and two or tliree species 

 occurrint;^ under one name. The 

 species referred t<j here as cyi/osura is 

 the one abundant in Massachusetts in 

 June, and presents two forms, as 

 follows: (i) that Unown as cynosura, 

 having the fuscous marking of the hind 

 wings restricted to the Immeiliate base 

 (9), or basal and anal parts {$) of 

 wings; anil (2) what has been called 

 semiaqitea, having the fuscous extend- 

 ing from the anal angle nearly to the 

 nodus, with a slight nodal spot which 

 is sometimes connected to the base; 

 specimens with markings intermediate 

 in character are not uncommon, 

 varying from a mere fuscous bordering 

 of the venules of the anal area up to the 

 form described here. These two forms 

 are doubtless one species, no structural 

 diflerences being perceptible. 



There is another species found in the 

 southern States, having the fuscous of 

 a more reddish hue, and even wider 

 in extent, which presents differences in 

 the abdominal appendages. This is 

 perhaps the ti ue semiaquca. 



Erythromma conditum Hag. 



A series of 3 $,2 $, specimens of tliis 

 species collected by Mr. S. W. Denton, 

 probaljly at Wellesley, Mass., presents an in- 

 teresting case of variation in venation. It 

 is the more worthy of attention for the 

 reason tliat the variation affects a character 

 upon which analytical keys are often based. 



In one female the lower sector of the tri- 

 angle arises distinctly before the basal post- 

 costal nervule, in the fore wings about twice 

 as far as in the hind wings; in the other 

 female it arises at the postcostal nervule on 

 all wings. In two males the sector arises 



just before it on the front wings and at it on 

 the hind wings; in the other male at or al- 

 most imperceptibly before on one hind wing, 

 very slightly before on the other, and dis- 

 tinctly before on the front wings. 



Enallagma traviatuni Selys vs. E. aspersum 

 Hag.' 



ISaiiks (Can. Ent., Mar. 1S94) considers 

 tra-'iatiim as '-hardly more than a variety of 

 tispersi/m." From this opinion I must 

 dissent, regarding it entitled to full specific 

 rank, a niimberof males collected lastsunimer 

 showing marked differences when compared 

 with ofi/^ei'srim. These differences, in ad- 

 dition to the cliaracters indicated in the 

 oiiginal description of Iravici/urn (Syn. d. 

 Agr.), are as follows : 1st, side view, travia- 

 tum: Superior abdominal appendage with 

 the upper branch slender, nearly equal 

 throughout, slightly decurved, the apex 

 equally rounded, not especially decurved. 

 Inferior appendage projecting one-third its 

 length beyond the lower branch of the sup. 

 app., the upper margin nearly straight, the 

 lower margin deeply excavated, the exca- 

 vation dividing the app. into a broad base 

 and a slender tip, the base being about four 

 times as broad and one-half as long as the tip, 

 which is slender, equal, straight, and directed 

 nearly straight backward. Side view, asfer- 

 ^iiiii: Sup. app. with upper branch rather 

 stout, its apex noticeably decurved. Inf. 

 app. projecting about as far as the lower 

 branch of the sup. app., its upper margin 

 concave, lower margin strongly convex. 2nd, 

 top view, traviatum: Sup. app. as long as 

 to; its upper branch slender, one-fourth to 

 one-third as wide at base as long, cylindrical, 

 nearly straight, the equally rounded tip verv 

 slightly incurved. Top view, aspersum: 

 Sup. app. shorter than the side of 10; the 

 upper branch rather broad, its width at 

 base nearly or quite one-half its length, 

 tapering, the tip slightly expanded inwardly, 

 forming an inner apical tooth; inner apical 

 margin truncate, oblique ; outer apical angle 

 rounded. 



