IO8 ENTOMOLOGICAL NEWS. [April. 'O2 



to it, in centre of the wing, is a short black dash. In subcostal area over 

 the discoidal space are two black spots, and another at the base. Inner 

 marginal area tends to grayish. Expanse .So inches. 



Hab. Sicasica, Bolivia. 

 Taken in October, 1899. 



A List of the Dragonflies Observed in Western 



Pennsylvania. 

 BY E. B. WILLIAMSON. 



(Continued from page 71.) 



27. Dromogomphus spinosus Selys. 



Alleghany County (G. A. L,ink) ; Alleghany County, May 

 3, 1899 ; Ohio Pyle, June 25-30, 1900. The Ohio Pyle speci- 

 mens have the humeral and antehumeral stripes and the stripe 

 on either side of the mid-dorsal thoracic carina wider than in 

 Indiana specimens ; the humeral and antehumeral are continu- 

 ous for almost their entire lengths, and the stripe on either 

 side of the mid-dorsal carina passes over the antealar sinus, 

 joining with the antehumeral stripe. 



28. Gomphus villosipes Selys. 



Turtle Swamp, June 3, 1899. In the spring of 1900 I found 

 this species in Mahoning County, Ohio, one of the eastern 

 tier of counties in Ohio, very abundant about ponds which 

 had been formed by a small stream changing its course from 

 time to time in a broad valley. The dragonflies spent much 

 of their time at rest on the spatterdock leaves with which these 

 ponds were filled. 



29. Gomphus sordidus Hagen. 



New Brighton, Beaver County, May 28, 1899 (H. D. Mer- 

 rick) ; Idlewild, May 30, 1899. In eastern Ohio, Columbiana 

 County, I observed a couple of this species pairing at rest, 

 clinging to the leaf of a blackberry bush. The male held the 

 female by the head with his abdominal appendages. 



30. Gomphus exilis Selys. 



Ohio Pyle, June 28, 1900 ; Confluence, June 30, 1900. Taken 

 along the Youghiogheny River only at its more sluggish parts 

 where the banks are muddy. 



