W*J 



ENTOMOLOGICAL NEWS* JUN4 ' 



AND 

 PROCEEDINGS OF THE ENTOMOLOGICAL SEC 



THE ACADEMY OF NATURAL SCIENCES, PHILADELPHIA. 



VOL. XXVIII. JUNE, 1917. No. 6. 



CONTENTS: 



Williamson Some Species of Leptag- 

 rion with Descriptions of a new 

 Genus and a new Species (Odon.) 241 



Girault New Chalcid Flies from Mary- 

 land, II ( Hym.) 255 



Summer Work on Insects 266 



Calvert Calopteryx dimidiata apicalis 



(Odon.) 266 



Hungerford The Life History of the 



Backswimmer, Notonecta undulata 



Gibson A new Species of Corythuca Say (Hem., Het. ) 267 



from the Northwest (Heterop., Tin- [ Parker Seasonal Abundance of Flies 

 gitidae) 258 j in Montana (Dipt ) 278 



Calvert Studies on Costa Rican Odo- 



nata VIII 259 



Dean The Knaus Collection of Cole- 



Change of Address 282 



Editorial The National Defense 

 Against and By Insects 283 



optera 263 Dunlap A New Biological Journal ... 284 



Rohvver Two new Species of Macro- Robertson The Generic Bugbear 285 



phya(Hym.) 264 Entomological Literature 286 



Some Species of Leptagrion with Descriptions of a 

 new Genus and a new Species (Odonata). 



By E. B. WILLIAMSON, Bluffton, Indiana. 



(Plates XVII, XVIII.) 



Foerster, in Ncotropischc Lib ell en III (Insekten Borse, 

 XXIII, 1906), describes two new Neotropical Agrionine 

 genera. One of these, Skiallagma, type baitcri n. sp., known 

 only from the male, is stated to be closely related to Enallagma, 

 a view with which I can hardly agree, since against the Enal- 

 hi(/nia-\\ke character of the quadrangle (which is not at -ill 

 characteristic, by the way, being a common form of quad- 

 rangle) one can set at once the absence of postocular spots 

 and the origin of A at the cubito-anal crossvein. Calvert 

 (Ann. Cam. Mus. VI, p. 176) describes a second species, bas- 

 ing his generic determination, so he writes me, on the fact that 

 his species seems to be close to baitcri. 



The second new genus proposed by Foerster is Hylaeagrion. 

 of which Leptagrion croceum, of his determination must be 

 the type, congeneric with which, according to Foerster, is his 

 new H. argcntcolhicatiiin, known from the male only. The 



241 



