200 ENTOMOLOGICAL NEWS. [Sept 



the river. 'Hie bed of the stream is filled with large sand- 

 stone and conglomerate boulders, past which the current 

 rushes with great velocity. 



The (Jalopteryx in its flight and habits much resembles 

 Hetaerina americana, flitting over the rapids, resting on the 

 boulders and on the few bushes and grasses margining the 

 stream . They are swifter in flight and more difficult to take 

 than Calopteryx maculata. Only adults were seen. One pair 

 was taken in copulation. 



Compared with Hagen's description, published in Psyche in 

 1889, the following may be noted : 



Hind wing, cf, 36 ; ?, 38. Width at nodus of hind wing, 

 c? and 9,8. Ante-cubitals, front wings, d* and ?, about 28 ; 

 ante-cubitals of hind wings, d^, about 22 ; 9, about 25. Ab- 

 domen, d, 46 ; 9, 43. 



(d. — Second joint of antennae, labrum and a small inferior 

 median spot on rhinarium greenish white ; labrum with a 

 round black spot just below the white spot on rhinarium ; la- 

 bium black, outer lobe narrowly margined with greenish 

 white ; upper part of head, especially about the ocelli, with 

 brassy reflections ; eyes brown, thorax and abdomen bright 

 green ; sutures of thorax black ; pectus pruinose with a trans- 

 verse green band before the base of i. Wings with the re- 

 ticulation largely green, most noticeable when seen from the 

 front ; subcostal apparently black ; median vein and princi- 

 pal sector closely joined for the distance of four or five ante- 

 cubitals ; principal sector apparently arising from the sub- 

 nodal. Abdomen darker anteriorly with bluish reflections, 

 tending to brassy posteriorly, greenish black underneath; 

 sternum of 1 chalky white ; base of sterna of3 to 8, with two blu- 

 ish spots ; appendages dark greenish brown, as compaaed with 

 G. virgo and C. maculata relatively longer, possibly with more 

 teeth on the exterior dorsal edge of the superiors. 



Since the above was written I have had the privilege of ex- 

 amining a male and female of this species cx)llected by Mr. R. 

 O. Osbnrn and Mr. J. B. Parker, on June 10th, in central Ohio, 

 eight days before the species was taken at Ohio Pyle. The 

 specimens were taken along Pine Creek, a tributary of Clear 

 Fork, which in turn empties into the Mohican. They offer 

 no differences from the western Pennsylvania specimens. 



