1903.] 51 



(2) Fig. 4, b. The humerus runs as in the last case, but is joined to the bra- 

 chius before their final meeting-point by an "oblique cross nerve" in the apical 

 portion of the area. 



Examples : Dolerus, Emphytus, Athalia. 



(3) Fig. 4, c. The humerus from its nearest basal point of approach to the 

 brachius throws out towards the latter a " short perpendicular nerve " which 

 reaches it. 



Example : Tenthredo. 



(4) Fig. 4, d. The humerus actually touches the brachius, but almost imme- 

 diately quits it again and runs round separately to g, where it rejoins it. " Cellula 

 breviter constricta." " Shortly contracted." 



Example : Macrophya 12-punctata. 



(5) Fig. 4, e. The humerus not merely touches the brachius but coalesces 

 with it for a while, then as usual leaves it and at g finally rejoins it. " Cellula 

 constricta." "Contracted cell." 



Examples : Cladius, Hoplocampa. 



(6) Fig. 4,/. The humerus vanishes near its origin, then presently re-appears 

 emerging from the brachius (as in the last case) and running round as usual at g. 

 " Cellula pet iolata." " Petiolate, J. e., stalked cell." (The stalk being the basal 

 part of the brachius). 



Examples : Nematus, Blennoeampa. In Kaliosysphinga this is really the 

 condition ; but the humerus, before disappearing, so nearly reaches the brachius 

 that the cell looks as if it were " contracted." 



Fi&. 4. — Different forms of Htjmbral area, or " Cellula lanceolata." 



? ? 



^ ■ Obd^ri. cell / I I 



' ir airuQue cross jicri/arc 



9- 



Cantra.ctecl 



We may uow discuss more briefly the neuration of the lower 

 wing, which is so closely analogous to that of the upper, that any one 

 who has taken the trouble to follow me so far, should have little diffi- 

 culty in understanding it. 



I figure this time an actual wing, and one in which the neuration 

 is pretty complete — that of a Croesus. 



E 2 



