•,i'2 INJURIOUvS INSECTS OF 1903. 



DIFFERENCE BETWEEN ATLAXIS AND SPRETUS. 



Mention lias been made of the great difficulty of distinction 

 between the native pest, the Lesser Migratory or White Moun- 

 tain Locust, Mclaiiopliis aflanis, and the more dreaded visitor 

 from the west, the Rocky Mountain Locust, M. spretus. The 

 best way for the farmer to know what he is deaHng with is to 

 send specimens to the Entomologist at the Experiment Station. 

 Any description of the two species necessaril}- involves the use 

 of so many technical terms as to make it unintelligible to the 

 general reader, nevertheless we append herewith a partial com- 

 parison of the two species, using as few scientific terms as 

 possible, in the hope that some reader entomologically inclined 

 may be helped thereby. 



ATL.\N1S. SPRETUS. 



Head — Head somewhat prominent. 



Head a little prominent. Eyes not very large or very prom- 

 Eyes moderate, rather promi- inent. 

 nent in male. 



Subgenital plate — 



Two lobes forming- notch on top 

 of last segment of the abdo- 

 mer of the male, not so prom- 

 inent as in spretus. 



Anal joint of male tapers more 

 suddenly than in spretus. 



Spine — 



The short spine (called proster- Prosternal spine rather long, 

 nal spine) between the base of shorter in female than in male, 

 the front legs, variable, usual- 

 ly short, conical. 



Tegmina — 



(The narrow brown fore wings) Tegmina, or fore wings, exception- 

 usually surpassing consider- ally long, much longer than the 

 ably the hind thighs, occasion- hind thighs, not very narrow, 

 ally, and especially in the fe- 

 male, only a little longer than Veins of wings mostly dark 

 the hind thighs; slender, feebly brown, 

 tapering. Veins of wings a 

 yellowish brown. 



