THE GENUS PISSODES. 39 



Subdivision B. 



Abdominal tergitea with small spines alternating with the larger ones and with small 

 spines between the more prominent dorsal ones. 



Epipleurite 9 with bristles Section a3 



Epipleurite 9 without bristles Section a4 



Section aS. 



Abdominal tergites 4 to 5 with two small spines between the more prominent dorsal 

 ones Species 17 



Section a4. 



Abdominal tergites 4 to 5 with four small spines between the metre jtrominent dorsal 

 ones. 



Beak without pair of spines between middle and apex Species 25, 26 



Beak with pair of small spines between middle and apex Species 27 



DIVISION II. 



Abdominal tergites 4 and 5 with two small spines between the more prominent dorsal 

 ones; beak with pair of small spines between apex and middle Species 29 



SYNOPSIS OF LARVAL CHARACTERS. 



DIVISION I, .Subdivision A. 



Mandibles with middle tooth emarginate Section al 



Mandibles with middle tooth triangular Sections a2, a3 



Mandibles with middle tooth emarginate or triangular Section a4 



Section al . 



Apical tooth acute Subsection b2 



Abdominal spiracles distinct. 



Head without distinct eye-spots Si)ecies 4, 5 



Head with distinct eye-spots Species 6 



Series c-i. 

 Abdominal spiracles distinct. 



Head without distinct eye-spots Species 7, 10 



Head with distinct eye-spots Species 14 



Section a2. 



Apical tooth ol)tuse; head with distinct eye-spots Species 15 



Apical tooth acute; head with distinct eye-spots Species 16 



Subdivision B. 



Section aS. 



Abdominal spiracles obscure; apical tooth acute; median tooth triangular; head with 

 distinct eye-spots Species 17 



Section a4. 



Series c5. 



Abdominal spiracles moderately distinct. 



Apical tooth obtuse; middle tooth triangular; head without eye-spots. .Species 18 

 Apical tooth acute; middle tooth emarginate; head without distinct eye-spots. 



Species 20 



