OF THE STxVTE ENTOMOLOGIST. 



155 



species should have one, is difficult to explain on the common theory 

 of the independent creation of species. On Mr. Darwin's theory, the 

 reason becomes at once apparent. Unless we choose to adopt that 

 theory, all we can say is that Natura non agit per saltum — Nature 

 does not proceed by sudden leaps — which is rather stating a fact than 

 explaining the reason of that fact." 



The truth, however, is that, so far as we have any evidence, 

 none of the true grasshoppers, in the sense that the term is here 

 employed, oviposit in the earth. Xiphidium oviposits in the cone- 

 like willow-gall {salicis stroliloides.) Conocephalufi has been ob- 

 served by Mr. S. I. Smith " with the ovipositor forced down between 

 the root-leaves and the stalk of a species of Andropogon^ where the 

 eggs are probably deposited";* and I have good evidence that 

 Orchelimum oviposits in twigs. It also appears, from the facts here 

 recorded, that only one of the true Katydids is known with certainty 

 to oviposit externally. Mr. Walsh's premises being wrong, therefore, 

 his conclusions are valueless ; and, while I can conceive that all these 

 different ovipositors have been modified from some archetypal form, 

 I can not consider any of them rudimental. They are all most admi- 

 rably adapted to the habits and wants of the possessors 



THE 



[Fig. 43.] 



ANGULAR-WINGED KATYDID 



(Burm.) 



This is by far our most common Katy- 

 did, and has been long confounded with 

 the Oblong-winged Katydid. From having 

 one of my earlier specimens marked for 

 me with the latter name, I had myself fre- 

 quently thus referred to it,f until I had 

 occasion to study the four species more 

 closely. It has large and ample wings, and 

 the outer borders of the wing-covers form 

 quite an angle (Fig. 45, c?.) The hind thighs 

 are comparatively short, and the ovipositor 

 of the female (Fig. -16, «, h) is very short 

 and much curved, being but little longer 

 than the feet, squarely cut off, and bluntly 

 toothed at the end, as in the illustration (?»). 



The eggs of this species, (Figs. 43 and 



Microcentrus retinervis 



[Fig. 44.] 



i 



't?&^ 



Eggs of Micko- 

 cextrus reti- ^ 



NEKVis : — a, ,...,. ^ ^\ ■ i" ^ 1 E<:gs of Michocent- 



ivont; b, sidc44,j irom their regular arrrangement and uusketixeuvis:— a, 



view, .iust lie- . . Iront; />, side view, 



ioreliatehing. expOSed pOSltlOU, are constantly attracting soon after laid. 



♦Packard's Guide, yt. 5(57. 



tin my last Report (j). 123,) this insect is everj-Avheve referred to, by mistake, under the name of 

 oblonijifolia . 



