212 ENTOMOLOGICAL SOCIETY 



vidualized type of metathorax, and this has been most admirably 

 brought out recently by Thomson. 



Take the Ichneumonidae for instance. In the group Ichneu- 

 monince all have a more or less distinctly areolated metathorax, 

 caused by raised lines, or carinae, variously arranged and modified 

 to form different shaped cells or areas. 



On Plate V, in the figures, I have attempted to illustrate these 

 areas and their value to us in classification. 



You will notice there are five series of cells three median and 

 two lateral. To these the following names may be applied : 



No. i. Basal area or first median area. 



2. Areola, upper median area or second median area. 



3. Petiolar area, apical area, or third median cell. 



4. External area or first lateral basal area. 



5. External median area or the second lateral area. 



6. Internal area, the middle apical area, or the third 



lateral area. 



7. The spiracular area or the first pleural area. 



8. The middle pleural area or the second pleural area. 



9. The angular area or the third pleural area. 



The carina3 or raised lines may also be named : 



M. M. are the two median longitudinal carinse. 

 L. L. are the two lateral longitudinal carinae. 

 P. P. are the two pleural carinae. 

 The transverse carinae are 



B. The basal transverse carina. 

 A. A. The apical transverse carina. 



These names will enable us to properly define the areas and 

 carinae in descriptive work. For instance, these carinae are 

 sometimes wanting between the areas. If the basal transverse 

 carina between the basal area and the areola or the median cell 

 (2) is wanting, we say basal area and median cell confluent; if 

 the median transverse carina be wanting, we then say median 

 and apical or the petiolar areas confluent and thus through the 

 whole series. 



In fig. 2, I show the metathoracic character of a Cryptid . 



