130 PROCEEDINGS OF THE ACADEMY OF [1888. 



jointed styles, nearly as long as the body. The number of joints in 

 the anal styles vary from 7 in an individual l of an inch long to 11 

 in an individual 1 of an inch long. The general shape of the body 

 is cylindrical, tapering posteriorly, with the ventral surface flattened. 

 All the segments, except the last, bear, on the dorsal half, four taper- 

 ing, jointed tubes, containing bi'anches of the trachea. The number 

 of joints in each of these appendages vary from 12 to 17 in a speci- 

 men i of an inch in length. In a specimen I of an inch long there 

 were 7 joints in each dorsal appendage. The main tracheal trunks 

 Tun one on each side, between the proximal ends of the two roAvs of 

 :appendages, through which they send long, straight branches. 



Plate VIII. 

 Pig. 1. The insect, or larva; actual length i inch; anal style 



and dorsal appendages about i inch; first pair of legs 



jso inch; second pair ^VV inch; third pair; 2V0 inch. 

 " 2. Jointed dorsal appendage, showing the relative length of 



the joints; actual length 2V0 inch; width of basal joint 



^55 inch; number of joints, fourteen. 

 " o. A joint highly magnified, showing the tracheal tube 



which runs to the distal extremity of the appendage. 



Antenna, six jointed ; total length sV inch. 



Dorsal aspect of head ; actual width 200 inch. 



Ventral aspect of head ; actual length 2to inch. 

 8. 9. 10. Oral appendages, magnified. 



One of the first pair of legs, actual length 2I0 inch. 



One of the second pair of legs ; actual length 2V0 inch. 



Anal style, actual length ^Vo inch, on specimen A of an 



