80 EXPLANATION OF TERMS 



Median area: of wings in Orthoptcra, lies between the radial and ulnar 

 veins, radius and media (Comst.) : of metathorax of Hymenoptera, is the 

 middle of the dorsum, divided into three spaces or cells : 1st or basal area, 

 2d or upper median or areola, 3d or apical or petiolar area. 



Median carina: Orlhoptcra; of head, is usually applied to a median dorsal 

 carina, but has been also used for that which extends down the middle of 

 front from the f astigium, and then = frontal costa : of prothorax, extends 

 along the middle of pronotum. 



Median cell: in Lcpidoptcra, is the closed area formed by a line extending 

 from the end of subcostal to the end of the median veins, = radial 

 (Comst.) : in Hymenoptera, 1st median (Pack.), = medial (Comst.) ; 2d 

 median (Pack.), = medial 4 (Comst.); 3d median (Pack.), = medial 2 

 (Comst.) ; 4th median (Pack.), = medial 1 (Comst.). 



Median cross-veins: in Odonata; are those which cross median space. 



Median foveola: in Orthoptcra; the foveate depression of the vertex be- 

 tween the eyes : = central foveola. 



Median forks: in Ortlwptera, refers to the forks of the median vein. 



Median furrow: lies between radius and media: in some Heteroptera, sepa- 

 rates the embolium from the remainder of the corium. 



Median lines: on the primaries of many moths; the first or t. a., crosses 

 about one-third from base ; the second or t. p., crosses beyond the outer 

 third and is usually sinuate. 



Median lobe: of labium in Odonata, is the partly divided glossa or ligula; 

 probably corresponds to united glossa and paraglossse (Butler). 



Median longitudinal caringe: on the metanotum of Hymenoptera, extend 

 one on each side of the middle. 



Median nervules: in Lcpidoptcra (Holland) ; lst = cubitus 2 (Comst.) ; 2d 

 = cubitus 1 (Comst.); 3d = media 3 (Comst.). 



Median notch: in Coccida-, a notch in the edge of the pygidium, at the 

 posterior extremity of the body. 



Median plate: in Hymenoptera sessiliventres, is the dorsal plate connecting 

 the thorax and abdomen. 



Median sector: in Odonata, = media 3 (Comst.). 



Median segment: applied to the basal segment of the abdomen when it forms 

 part of the metathorax : see propodeum. 



Median shade or line: in Lcpidoptcra, crosses at or about middle of ' wings. 



Median space: in Lcpidoptcra, is the area between the median lines: in 

 Odonata, the cubital cell (Comst.) ; the space at base between submedian 

 (radius) and postcosta (1st anal) ; by Selys in 1896 and later used in the 

 sense of medial cell of Comst. 



Median vein: in Odonata and Lcpidoptcra, = radius (Comst.) : in Lcpi-dop- 

 tcra, it runs from base to about middle, nearly through centre, and is four 

 or five branched : in Hymenoptera, it is the 3d from costal margin. 



Mediastinal: relating to the longitudinal median line or area. 



Mediastinal area: in Orthoptcra, the area between median or mediastinal 

 vein and the costal or front margin: = marginal area. 



Mediastinal vein: in Orthoptcra and Diptera, = subcosta (Comst.) : also, in 

 Diptcra, = auxiliary vein (Meigen). 



