i 



278 ENTOMOLOGICAL NEWS. [Oct., '04 



ronment. The partial drainage of a swamp may result in the 

 disappearance of certain species ; the opening of a gravel-pit or 

 the making of an artificial lake in a park may result in the 

 almost immediate appearance of species hitherto unsuspected 

 in the neighborhood. Every stream, bayou and ox-bow bend, 

 every lake, pond, marsh and artificial body of water may have 

 its peculiar species, all trace of which will sooner or later be 

 lost by natural topographical and ecological evolution or the 

 substitution of artificial conditions, unless some printed record 

 be made of their occurrence. For this reason more collecting 

 and more lists are desirable. Especially is this true in west- 

 ern Pennsylvania. 



Dr. Atkinson collected at Sandy Lake, July 8-10, 1904. 

 Species designated * are additions to the list of dragonflies ob- 

 served in western Pennsylvania. See Ent. News, March, 

 1902, pp. 65-70, and April, 1902, pp. 108-113. Seventy-two 

 species of Odonates have now been observed in this region. 

 I . Lestes redangularis, several specimens of both sexes. 



*2. Argia tibialis, two males, one female in the collection. 



3. Chromagrion condiium, three males. 



4. Nehalennia irene, one of each sex. 



5. Amphiagrion saucium, one male. 



6. Enallagma hageni, thirteen males. 



7. Cordulegaster diastatops, one male. In the Ent. News, 

 April 1902, p. no. No. 41, Cordulegaster maculatiis is an incor- 

 rect determination. The specimen recorded is C. diastatops. 



8. Leiicorhinia intacta, four females. 



9. Synipetruni riibiciinduliim, several of each sex. 

 10. Sympetrutn obtrusuni, three males. 



*ii. Libellula quadrirnaculata, owt^msXt. 



The Egg Cocoon of the Triangle Spider, 

 By Theo. H. Scheffer, Manhattan, Kan. 

 From the evidence at hand it seems that nothing has ever 

 been published concerning the cocooning habits of that inter- 

 esting little orb weaver, the Triangle Spider {Hytiotes eavatus) . 

 The species was first described by Hentz under the name 



