26 



PS I CHE. 



[February 1S91. 



guish with certainty from that of vul- 

 gar e but usually the zip-zip is repeated 

 only once or twice very rapidly and the 

 ze-e-e-e-e does not continue so long. The 

 earliest recorded date for it here is the 

 1st of August. 



40. Orchelimum silvaticum n. sp. A 

 species occurs here not very rarely that 

 I have thought until recently to be O. 

 agile De Geer, but a careful compari- 

 son with typical specimens of that spe- 

 cies shows so many points of difference 

 that I think they should be considered 

 specifically distinct. 



Length of body $ 70 $ .70; length of 

 elytra $ .60 to .70 °. .56 to .70; length of 

 posterior femora $ .59 $ .59; length of an- 

 tennae $ ? 22 ; length of ovipositor <j> .32. 

 Very similar to agile but different in the fol- 

 lowing particulars : The elytra and wings are 

 shorter and in the male, at least, the latter 

 do not exceed the former. The posterior 

 femora are relatively shorter and less atten- 

 uated apically though similarly armed with 

 about three small spines on the under side 

 of the apical half. The pronotum is con- 

 spicuously larger and the lateral lobes are 

 decidedly wider at the humeral sinus. The 

 brownish stripes on the disk of the pronotum 

 are more remote from each other. In the 

 proportions of the body, pronotum, hind 

 Temora, wings and elytra this species ap- 

 proaches vulgare much more closely than 

 agile but it can be separated at once from the 

 former by the presence of the spines on the 

 under side of the hind femora. 



I found this Orchelimum first on corn 

 afterw rds more commonly in open 

 places in woods. Its stridulation is quite 

 distinct from th.it of vulgare. It con- 

 sists of the same two elements but the 

 zip is repeated many times very rapidly 



so as to make almost a continuous sound 

 and the ze-e-e-e is comparatively short 

 and very constant lasting about eight 

 seconds. The first part of the song lasts 

 from three to five seconds. I have not 

 taken this species before the 7th of 

 Sep ember. 



41. Orcheli?n?im volantum n. sp. A 

 second species occurs here which I 

 think has not been described unless I 

 am mistaken in my identification of 

 longipe?inis. In this case the supposed 

 new species might be the latter. The 

 specimens which I refer to longipennis 

 agree in every, particular with the de- 

 scription of that species and the new 

 species does not agree in the characters 

 given and it has so many characters 

 strikingly different from any Orchel- 

 imum that I know that I think there 

 can be little risk in making a synonym 

 if I describe it. 



Length of body, $ .72 5 1.04; length of 

 elytra ^ 1 $ 140; length of wings $ 1.12 



§ 1.50; length of posterior femora $ .66 $ 

 .SS; length of antennae $ 2.25 $ 2.50; 



length of ovipositor .44. The general col- 

 or is green with the usual brown band on 

 the head and pronotum very incomplete. 

 On the disk of the pronotum it divides into 

 two stripes which form almost a complete 

 ellipse enclosing a short stripe on the 

 front part of the disk while on the poste- 

 rior part these stripes diverge but do not ex- 

 tend beyond the principal sulcus. The pro- 

 notum is of medium size, with the lateral 

 lobes well rounded on their lower border and 

 the humeral sinus deep. The vertex is de- 

 cidedly turned up at the tip and the occiput 

 is flat so that the top of the head is strongly 

 concave. The elytra and wings are very 

 long and narrower in proportion than in any 



