ENTOMOLOGICAL NEWS. 269 



Guerin's genus Tachypterus has been generally called Tra- 

 chypterus. The former is the original spelling, and should not 

 have been emended. Moreover, such emendation in this case 

 would require that Guerin's term be dropped, as Tradiyptcrus 

 Gouan (1770) would have priority. 



Moncdula L,atreille (1804) is preoccupied by Moncdula Has- 

 selquist (1762). Illiger (in Rossius, Fauna Etrnsca, vol. 2, 

 1807) was aware of the prior use of the term in Ornithology, 

 and proposed the name Stictia to replace Moncdula L,atreille. 

 Illiger 's term should be therefore adopted for this genus. 



Monedula has sometimes been credited to Coquebert (1798), 

 but this is an error. 



Contributions to the Odonata of Maine. IV. 



By (the late) F. L,. HARVEY, Orono, Me. 



(Continued from page 243.) 



71. Ophiogomphus johannus Needham. 



We took two males of this species at Chemo stream, Bradley, 

 Me., July 4 and n, 1899. They were flying over swift water 

 and alighting on rocks projecting above the water. No females 

 were seen. The original description was drawn up from a 

 single .teneral male. Our specimens are mature and in full 

 color. We are able to add the following notes : 



Thorax grass green. The median dorsal fuscous stripe is apparent the 

 whole length of the carina and broader anteriorly. The humeral and 

 antehumeral stripes not fused, but separated the whole length in one 

 specimen and only slightly fused at the posteror end on one side of the 

 other. The antehumeral stripe broadest anteriorly narrowing backwards 

 to a point, separated from the humeral by a green stripe of its own 

 width. Sides of thorax grass green above and paler toward the base of 

 the legs. Wings slightly smoky. The appendages agree closely with 

 Needham's description and figures, excepting that the lateral tooth on 

 the lower appendage is more prominent, and the tip of the superior, in 

 profile, is transversely notched showing in side view an inferior and 

 a superior tooth, the latter longer. 



We have a single female Ophiogomphus taken behind the 

 town building in Orono, June :6, 1898, by my daughter, 

 Florence Harvey. It is different from the females of O. a tin- 



