USED IN ENTOMOLOGY. 



•53 



EXPLANATION OF PLATES. 

 PLATE L 



Structures of the External Body Wall. 



1. Har pains caliginosus showing the underside, and the head from above, to 



show the regions and the position of the sclerites. 



2. Thorax of a Dipteron to show location of bristles. 



3. Lateral view of a denuded Lepidopteron to show arrangement of sclerites. 



4. Abdominal segment of a caterpillar to show the position of the tubercles. 



5. Lateral view of a dragon fly to show the body sclerites. 



All the abbreviations used in this plate are readily understood. 



PLATE II. 



Structures of Head, Mouth, Thorax and Genitalia 



1. Head of wasp from front. 



2. " honey bee with mouth parts extended. 



3. " Locustid from front, to show regions. 



4. " a Lepidopteron from front. 



5. " a cricket from front. 



6. Labium of a cricket showing all usual parts. 



7. Maxilla of Harpaltis caliginosus, with all sclerites marked. 



8. Mandible of Copris Carolina with all sclerites defined. 



9. Thorax of a Hymenopteron from above. 



10. Genitalia of a male mosquito with all parts named. 



11. Genitalia of a male Noctuid from below; the parts separated out. 



PLATE III. 



Venation According to the Comstock System. 



1. Wing venation of a Noctuid. 



2. " " " Hepialid. 



3. " " " Locustid. 



4. " " " Hymenopteron. 



5. " " " Dipteron. 



6. " " of an Odonat. 



7. " " of a Cicada. 

 Abbreviations are as follows : 



C. Costa, except in figure i, where on the outer margin C occurs instead of 



Cu. In the cells it means Costal. 

 Sc. Subcosta, when it refers to a vein and subcostal in a cell. 

 R. Radius, when it refers to a vein and radial when in a cell. 

 M. Media, when it refers to a vein and median in a cell. 



