ART. 1. NORTH AMERICAN" SAWFLIES ROHWER. 3 



The three genera grouped together in this subfamily although 

 closely allied to the Nematinae have certain characters which sug- 

 gest a relationship to the genus Monoctenus. In venation, especially 

 in the position of the basal vein, they are very like Monoctenus, 

 The ovipositor of species of the genera Cladius and Priophorus is 

 very similar to the ovipositor of species of the genus Menoctenus, 

 while on the other hand the ovipositor of the species of the genus 

 Trichiocarnpus is very similar to that of certain genera and species 

 in the subfamily Nematinae. In the structure of the thorax, the 

 adults are more closely allied to the Nematinae than to the genus 

 Menoctenus. In the larva, affinity to the Nematinae is perhaps even 

 more striking than in the adult, and there is no more to suggest rela- 

 tionship with Monoctenus in the Cladiinae than there is in the 

 Nematinae. 



The genus Trichiocampus as here defined is more different from 

 both Cladius and Priophorus than these two are from each other 

 and we believe that it will later be found advisable to express this 

 by the use of subgenera. Such an arrangement would reduce Prio- 

 phorus to a subgenus of Cladius. 



Subfamily Characters^ Adults. — Small or medium sized, usually 

 black sawflies of a Nematine habitus ; prepectus present although in 

 some of the black species the prepectal furrow is indistinct ; proepis- 

 ternum short, not meeting ventrally ; malar space present, inner mar- 

 gin of the eyes nearly parallel; clypeus somewhat emarginate; 

 antennae nine-jointed; the flagellum variable; interradius wanting; 

 three closed cubital cells (often the first intercubitus is obsolescent) ; 

 basal vein joining the subcosta close to the origin of the cubitus; 

 nervulus at or somewhat beyond the middle of the first discoidal cell ; 

 basal vein and first recurrent strongly divergent ; second recurrent re- 

 ceived by the third cubital cell; anal cell broadly contracted; dis- 

 coidellan cell present, usually extending beyond the first cubitalellan 

 cell; anellan cell longly petiolate; tarsal claws cleft with the inner 

 tooth shorter. 



Larvae. — All larvae studied have the following characters in com- 

 mon, and it is fair to assume that the characters given below are of 

 subfamily value. 



Antennae 4-jointed (chitinized, disk type, with central cone sur- 

 rounded by flattened oval disks, outer disk may be broken into two 

 floating or disconnected parts) (fig. 53) ; lacinial armature with a 

 pair of blades or setae near galea and distinctly separate from the 

 main series of blades or setae*; maxially palpi 5-jointed; labial palpi 



* This character is found, so far as known, in only one Nematinae larva (Pteronidea 

 amelanchieridis Rohwer), which clings to the surface of the leaf of Amelanchier cana- 

 densis, upon which it feeds, and which resembles to a considerable degree Cladiinae larvse, 

 although it is deToid of long, prominent hairs. 



