Dr. M. Burr — Notes on the Forficularia. 83 



Doru lineare, Escli. (PI. V. fig. 9.) 



I cannot see any cross-communication in the squama; 

 there is a faint but visible inner branch to the ulnar vein; 

 tlie ninth nervurc is slightly angled, the tenth 4-s]iape(l, and 

 eleventh simple. The wing is somewhat narrower than in 

 the two preceding species. 



From the meagre material I deduct the following : — 



The presence or absence of cross-communication in the 

 scjuama is of doubtful constancy and difficult to detect. A 

 fourth vein may be present in the squama. 



The sector of the third vein of the squama and inner 

 branch of the ulnar vein are one thing, though often in- 

 distinct in the middle and so divided into two, and that 

 Zacher overrates the value of this feature. The ninth radial 

 nervure may be angled, that is, has a triangular field in the 

 Kudcrmaptera, but is straight in the Protodermaptcra : this 

 seems to me a better expression. 



The first and second radial veins have a common base in 

 the Protodermaptcra, but not in the Eudermaptera. 



Tlie ninth radial is straight in Alloslethella and Kalocrania, 

 but angled in Labidura and in the Eudermaptera. 



The tenth radial is Y-shaped in Alloslethella and Kalo- 

 crania, but 4-shapcd in Labidura and in the Forficulidie ; it 

 is of intermediate shape in the Labiidse, the 4 being so 

 narrow as to pass insensibly into a Y in some species. 



The eleventh radial has a closed loop in the Proto- 

 dcrinaptera, but is simple in the Forficulidre ; it is of inter- 

 mediate form in the Labiidae, the loop being actu;dly closed 

 in Labia annulata. 



Thus it will be seen that apparently there is no set of 

 characters provided by the neuration sharply dividing the 

 Protodermaptcra from the Eudermaptera, but that Labidura 

 and the Labiidre have some features in common with the 

 Pygidicranidae and Allostethime on one hand, and with the 

 Forficulidse on the other. 



EXPLANATION OF THE PLATES. 

 Plate m. 



Fif/. \. Kalocrania picta, Giier, X 4. 



/'///. 2. AllostethcUa t)ialai/iuia, Zacher. X 6. 



A. Mari^aual area. 



B. Squama, 



C. Apical area. 



D. Ulnar area. 



6* 



