310 Mr. B. F. Cummings on the First MaxiUce 



the distal, extiemity of segment 2, but at a point about two- 

 thirds of the way along the length of the second segment, 

 thus giving the palpus an elbowed appearance, as in some 

 other Trichoptera. On the " elbow " — i. e., the end of the 

 second segment — stands a group of peculiar columnar sense- 



Fi<r. 3. 



Oue of tlie cohimiiar sense-organs, liighly magnified. 

 Fig. 4. 



Mouth-parts of Dipseudopsis, diagrammatic. ^ 



A. Two basal joints of palp of first maxilla. 



B. Extension of the gena from the head. 



C. Outer lobe of first maxilla, 



D. Labial palp. 



organs* They are about twenty in number, each with a 

 swollen pedestal, a fine central canal, and a somew at cup- 

 shaped extremity. Terminal joint of the palpus longest and 

 composed of subsegments. 



