SOMATIC CHARACTERS AND CHROMATIN ROD-LENGTHS. 115- 



S. virididus, and S. UcoJor is not unrepresented in S. curt'ipennis, but is. 

 functionally identical with Chromosome 15, which has not yet grown 

 sufficiently in the last-named to be classed in the higher category^ Corre- 

 spondence between the remaining long chromosomes can be seen in the 

 diagram by following the arrows, which have been inserted to show identities- 

 in all cases. 



If the difference between terms of the general series is eventually found' 

 to be smaller than half the rod diameter, chromosomes that we now class as 

 consecutive must be separated by intermediate lengths, and those that we 

 class together may, as a result of more accurate means of measurement, be 

 shown to have minutely differing lengths : this, however, cannot affect the 

 three long chromosomes of Stenohothrus, for their respective lengths are 

 such that mistake in identification is impossible. We must nevertheless 

 remember that the correspondence indicated by the arrows is based upon 

 a pure hypothesis, and that at present we possess no direct evidence in 

 support of this correspondence. 



Turning now to the consideration of somatic characters, we find that these 

 grasshoppers are individually distinguished by slight but clearly defined 

 differences. The following descriptions give the principal characteristics 

 and are quoted from the works of Bolivar, Burr, and Kirby. 



Stenobothrus parallelus. 



1. Very variable in colour. 



2. Antennae longer in male than in female. 



3. Pronotum with transverse furrow nearer to posterior than to anterior- 



border, 



4. Lateral carinae of pronotum almost parallel or slightly approximating 



about the middle. 



5. Elytra do not reach end of abdomen in male ; in female do not reach 



beyond fourth abdominal segment. 



6. Mediastinal area of elytra extended abruptly towards the apex and 



extended round base, forming a rounded lobule ; anterior margin of 

 elytra convex round base. 



7. Wings rudimentary. 



8. Length of body, male 14-15 mm., female 18-21 mm. 



Stenobothrus viridulus. 



1. Green varied with darker. 



2. Antennae longer in male than in female. 



3. Pronotum with transverse furrow midway between anterior and posterior 



borders. 



4. Lateral carinas of pronotum slightly angled near anterior border,^^ 



rounded slightly posteriorly. 



