ENTOMOLOGICAL NEWS 



AND 



PROCEEDINGS OF THE ENTOMOLOGICAL SECTION 



THE ACADEMY OF NATURAL SCIENCES, PHILADELPHIA. 



Vol. XXVIII. JUNE, 1917- No. 6. 



CONTENTS: 



Williamson— Some Species of Leptag- I Summer Work on Insects 266 



rion with Descriptions of a new \ Calvert — Calopteryx dimidiata apicalis 



Genus and a new Species (Odon.) 241 I (Odon.) 266 



Girault— New Chalcid Flies from Mary- } Hungerford— The Life History of the 



land, II ( Hym.) 255 j Backswimmer, Notonecta undulata 



Gibson — A new Species of Corythuca 1 Say ( Hem., Het.) 267 



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



Ritidae) 258 ' in Montana (Dipt ) 278 



Calvert — Studies on Costa Rican Odo- I Change of Address 282 



nata — VIII 259 Editorial — The National Defense 



Dean— The Knaus Collection of Cole- I Against and By Insects 283 



optera 263 Dunlap — A New Biological Journal ... 2S4 



Rohwer — 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 Neotropischc LibcUcn III (Insekten Borse, 

 XXTII, igo6), 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- 

 lagma-Vike. character of the quadrangle (which is not at all 

 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. Carn. 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 bancri. 



The second new genus proposed by Foerster is Hylaeagrion. 

 of which Le ptagrion croceum. of his determination must be 

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

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



241 



