July 1S90.] 



PSYCHE. 



371 



is furcated, giving 3 and 4 areoles ; med- 

 ian space of front wings with 3 (left) or 

 3 (I'ight) transversals ; median space of 

 hind wings with 4 (left) or 3 (right) 

 transversals ; basilar space of all wings 

 with r transversal ; membranula snow- 

 white, blackish on tip. 



Male Female 

 Length of body with appendages 43 45-53 

 " " abdomen with " 30 34-36^ 



" £il'i Slip- 31 34-37^ 



" ala inf. 30 33-3S 



" " pterostigma 3 3.^ 



" " appendages sup. 2I 2^ 



'' " tibia post. 6 6- 6J 



Breadth of head 7 7-8 



" " ala sup. 84 8|--io 



" " ala inf. 1 1 11-13 



Expanse of ala inf. 62 70-74 



Habitat : Indiana and Massachu- 

 setts, Say; New Orleans, La., Bur- 

 meister ; Rock Island, 111., Walsh; Ga- 

 lena, 111., Mr. T. E. Bean. The types 

 of Say from Indiana and the type of 

 Walsh are destroyed. I saw the latter 

 in 1868 and am sure that it belongs to 

 E. obsoleta. 



Say's type from Massachusetts, a fe- 

 male collected in 1S20 in a meadow at 

 Milton, near Boston, still exists in the 

 Harris collection at the Boston society 

 of natural history ; the type of Burmeis- 

 ter a male and a male from Galena are 

 in my collection. These are the only 

 specimens known and have been in the 

 hands of Baron De Selys Longchamps 

 for his Synopsis. The type of Burmeis- 

 ter is immature and in bad condition ; it 

 was placed in Didy?nops in my Synop- 

 sis as I did not care to found a new ge- 

 nus on such insufficient material and 



therefore placed the species in the genus 

 I believed most suitable. I was aware 

 that the branches of the tarsal nails 

 were imequal. but the only specimen of 



D. transversa in my possession at that 

 time was also in very poor condition, 

 and the omission to state the difference 

 in the claws induced Mr. Walsh to over- 

 look the identity of his species with that 

 of Say. This species is very close to 



E. yamaskanensis Provancher, of 

 which I have seen the only pair known. 

 Considering the aberrations in the vena- 

 tion in E. obsoleta I believed after my 

 first examination of the male, that both 

 belong to the same species, but the dis- 

 covery of the female seems to prove 

 them different. E. yamaskaneitsis is 

 larger, the head more globidar, rather 

 longer, occiput narrower, the wings 

 longer but of the same breadth, the stig- 

 ma shorter, the spots in the subcostal 

 space almost wanting, antecubltals more 

 numerous, the base of all the wings or- 

 ange, legs longer, <;uperior appendages 

 of the male black, longer, visibly more 

 dilated, with a small inferior notch in 

 the middle ; apical border between them 

 prolonged into an acute recurved tip. I 

 think it will be more prudent to accept 

 them as distinct species until more spec- 

 imens shall show intermediate forms. 



3. CORDUI.IA LINTNERI. 



Cordulia lintneri Hagen 3d Add. 

 syn. Cordul. 1S78, 9, 14.* 



Male. Head large ; labrum and la- 

 bium bright yellow ; face gi"eenish 



*This is Libeltula vacua Hagen (no descr.) Stett. enf 

 zeit., 1867, V. 28, 91. The cf is figured without name by 

 Emmons, in DeKay Agric. N. Y., v. 5, pi. 15, f. i. 



