NO. 1687. THE THORAX OF I\8ECT8—8N0D(IRA^S. 595 



Fig. 19S. Hydrophilus triangularis, base of wiug. 



199. Mcloiitlia vulgaris, right axillaries separated, but in nalm-al relative 



positions. 



200. Corydnlis cornuta, base of front wing. 



201. Corydalis cornuta, base of hind wing. 



I'latk (JS. 



Fig. 202. Phassus argentiferns, base of front wing and l):iso of .ingiini (Ju). 



203. Phassus argciitifcrus, base of hind wing. 



204. Protoparcr rliigulata, base of hind wing with frenuhnn {Pr). 



205. Ciinhcx amcricana, base of front wing. 



206. 8ircx' flavipennis, base of front wing. 



207. Sirew flavipennis, base of hind wing. 



Plate 09. 



Fig. 20s. Pepsis, sp., base of front wing. 



209. Pepsis sp., base of hind wing. 



210. Holorusia grandis, base of wing. 



211. Holorusia grandis, base of halter. 



212. Culliphora voniitoria, base of wing witli the two sipianue of the 



alula (Al), 



[Note. — Since this paper has been made np into pages the writer 

 finds tliat he overlooked the fact tliat Riley (1904) ascribes a small 

 part of the back of the head in Blatta, the " posterior maxillary 

 pleurites " of Comstock and Kochi (1902) to the labial segment. If 

 this is so then the microthoracic segment does play a small part in 

 the formation of the head capsule. 



As it was too late, to put this in as a footnote on page 522, it has 

 been inserted here.] 



