ABT. 1. NOETH AMERICAN SAWFLIES — ROHWER. 5 



the male antennae, but an examination of the description of the 

 larva, the female ovipositor, and habits as given by von Vollen- 

 hoven,* shows that in those characters it agrees with Priophorus and 

 not with the species here assigned to THchiocam'pus. Adults re- 

 ceived from Enslin also show the leg and head characters of Prio- 

 phorus. To use the character of the antenna as of generic value 

 makes it impossible to find characters in the larvae or biology which 

 can be used to separate species of Cladiinae into generic units. We 

 are, therefore, of the opinion that the larvae, biology, character of 

 the ovipositor and legs offer a satisfactory and natural means of 

 grouping these insects and have employed them in the following 

 synopsis : 



EKY TO THE GENERA BASED ON ADULTS. 



1. Anterior basitarsus distinctly sliorter than tlie three following joints which 



are sharply separated from each other; supraclypeal area triangular in 

 outline, gently convex ; lower margin of tlie lancets nearly straight and 

 with 12 or more regular teeth ; the posterior margin of the lancet plates at 



most feebly armed Trichlocampus Hartig. 



Anterior basitarsus subequal with or longer than the three following joints 

 which are not sharply differentiated ; suproclypeal area rectangular in out- 

 line, strongly convex, almost keel-like ; lower margin of lancets strongly 

 curved and with eight large teeth ; posterior margin of lancet plates 

 strongly armed 2 



2. Female antennae short, the tliird joint constricted medianly so it is strongly 



concave beneath ; dorsal side of antennal joints 3 to 6 in male armed with 

 rami apically, the third joint with a projection at base beneath. 



Cladius Rossi. 



Antennae of male and female normal, or occasionally the third joint in the 



male has a projection at the base beneath Triophorus Dahlbom. 



KEY TO THE GENERA BASED ON LARVAE. 



The following synopsis gives the most reliable and useable generic charac- 

 ters we have found on the larvae studied. While we have not been able to ex- 

 amine larvae of all of the species, it seems probable that we have had sufficient 

 material to express confidence in the characters here used. 



1. Gregarious feeders ; body black spotted, sometimes subdorsally, always supra- 



alar and epipleural regions; head mostly black (at least frons and entire 



dorsum from eye to eye) ; figures 57-59 and 71 Trichlocampus Hartig. 



Solitary feeders; body not spotted; head mostly pale (eye spots and some- 

 times vertex black) 2 



2. Vertex and eye spots black ; body usually grayish dorsally, especially in 



thorax from annulet A mesothorax to and including annulet C metathorax 

 and abdominally on the eighth and ninth segments ; figures 61 and 73. 



Priophorus Dahlbom, 

 Head pale excepting black eye spots, body entirely pale ; figures 60 and 62. 



Cladius Rossi 



«Tijdschr. v. Ent., vol. 4, 1860, pp. 84-87. 



